Migrate from libsignal-protocol-java to libsignal

Android improvements

.github/workflows/ci.yml

@@ -6,13 +6,14 @@ jobs:
   build:
     name: Build Smack
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         java:
-          - 11
+          - 17
+          - 21
     env:
-      PRIMARY_JAVA_VERSION: 11
+      PRIMARY_JAVA_VERSION: 21
 
     steps:
       - name: Checkout
@@ -52,10 +53,10 @@ jobs:
       - name: Install GraphViz
         run: sudo apt update && sudo apt install graphviz
       - name: Install Android SDK Manager
-        uses: android-actions/setup-android@v2
+        uses: android-actions/setup-android@v3
       - name: Install Android SDK
         run: |
-          sdkmanager "platforms;android-19"
+          sdkmanager "platforms;android-23"
 
       # Testing
       - name: Gradle Check
@@ -71,15 +72,22 @@ jobs:
         run: ./gradlew javadocAll --stacktrace
 
       # Test Coverage Report
-      - name: Jacoco Test Coverage
+      - name: Aggregated Jacoco Test Coverage Report
         if: ${{ matrix.java == env.PRIMARY_JAVA_VERSION }}
-        run: ./gradlew jacocoRootReport coveralls
-        env:
-          COVERALLS_REPO_TOKEN: S2ecSJja2cKJa9yv45C8ZFPohXuRrTXKd
+        run: |
+          ./gradlew smack-java11-full:testCodeCoverageReport
+
+      # Coveralls
+      - name: Report coverage stats to Coveralls
+        if: ${{ matrix.java == env.PRIMARY_JAVA_VERSION }}
+        uses: coverallsapp/github-action@v2
+        with:
+          format: jacoco
+          file: smack-java11-full/build/reports/jacoco/testCodeCoverageReport/testCodeCoverageReport.xml
 
       # Upload build artifacts
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: smack-java-${{ matrix.java }}
           path: |

.gitignore

@@ -3,6 +3,7 @@
 *.iml
 *.ipr
 *.iws
+!.idea/icon.svg
 
 # Mac OS X
 .DS_Store
@@ -11,7 +12,6 @@
 .project
 .settings
 .gradle
-gradle.properties
 
 build/
 core/build/

.idea/icon.svg

@@ -0,0 +1,89 @@
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+   xml:space="preserve"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.91 r13725"
+   sodipodi:docname="smack-logo-plain.svg"><sodipodi:namedview
+     pagecolor="#ffffff"
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+     borderopacity="1"
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CHANGELOG.md

@@ -1,5 +1,31 @@
 # Smack Changelog
 
+# 4.4.8 -- 2024-04-02
+
+### Improvement
+
+[SMACK-941](https://igniterealtime.atlassian.net/browse/SMACK-941) Suppress "roster not loaded while processing presence" warning if its caused by the reflected self-presence
+
+### Bug
+
+[SMACK-938](https://igniterealtime.atlassian.net/browse/SMACK-938) Busy loop in SmackReactor
+
+[SMACK-940](https://igniterealtime.atlassian.net/browse/SMACK-940) Ignore IPv6 Zone IDs in incoming streamhost candidates
+
+# 4.4.7 -- 2023-11-25
+
+### Improvement
+
+- [SMACK-929](https://igniterealtime.atlassian.net/browse/SMACK-929) Ignore IPv6 Zone IDs in incoming Jingle candidates
+- [SMACK-934](https://igniterealtime.atlassian.net/browse/SMACK-934) Deprecate and remove ChatMarkersManager.isSupportedByServer\(\)
+- [SMACK-937](https://igniterealtime.atlassian.net/browse/SMACK-937) Avoid unnecessary feature lookups by making the EntityCaps listener synchronous
+
+### Bug
+
+- [SMACK-927](https://igniterealtime.atlassian.net/browse/SMACK-927) Deadlock due to recveive listeners may be invoked after AbstractXMPPConnection.invokeStanzaCollectorsAndNotifyRecvListeners\(\) returned
+- [SMACK-930](https://igniterealtime.atlassian.net/browse/SMACK-930) Rename ELEMENT 'candidate-activated' to 'activated' per XEP-0260
+- [SMACK-931](https://igniterealtime.atlassian.net/browse/SMACK-931) IQ error stanza generation does not allow adding of an extension element
+
 # 4.4.6 -- 2022-06-29
 
 ### Bug

Makefile

@@ -0,0 +1,30 @@
+GRADLE ?= ./gradlew
+
+.PHONY: all
+all: check jacocoRootReport javadocAll sinttest
+
+.PHONY: codecov
+codecov:
+	$(GRADLE) smack-java11-full:testCodeCoverageReport
+	echo "Report available at smack-java11-full/build/reports/jacoco/testCodeCoverageReport/html/index.html"
+
+.PHONY: check
+check:
+	$(GRADLE) $@
+
+.PHONY: eclipse
+eclipse:
+	$(GRADLE) $@
+
+.PHONY: sinttest
+sinttest:
+	$(GRADLE) $@
+
+.PHONY: jacocoRootReport
+jacocoRootReport:
+	$(GRADLE) $@
+
+.PHONY: javadocAll
+javadocAll:
+	$(GRADLE) $@
+	echo "Smack javadoc available at build/javadoc/index.html"

build-logic/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+	id 'groovy-gradle-plugin'
+}
+
+repositories {
+	gradlePluginPortal()
+}
+
+dependencies {
+	implementation "biz.aQute.bnd:biz.aQute.bnd.gradle:7.0.0"
+	implementation "me.champeau.jmh:jmh-gradle-plugin:0.7.2"
+	implementation "net.ltgt.gradle:gradle-errorprone-plugin:4.0.1"
+	implementation "ru.vyarus:gradle-animalsniffer-plugin:1.7.1"
+}

build-logic/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'smack-build-logic'

build-logic/src/main/groovy/org.igniterealtime.smack.android-boot-classpath-conventions.gradle

@@ -0,0 +1,6 @@
+compileJava {
+	options.bootstrapClasspath = files(androidBootClasspath)
+}
+javadoc {
+	classpath += files(androidBootClasspath)
+}

build-logic/src/main/groovy/org.igniterealtime.smack.android-conventions.gradle

@@ -0,0 +1,10 @@
+plugins {
+	id 'ru.vyarus.animalsniffer'
+	id 'org.igniterealtime.smack.global-conventions'
+}
+dependencies {
+	signature "net.sf.androidscents.signature:android-api-level-${smackMinAndroidSdk}:6.0_r3@signature"
+}
+animalsniffer {
+	sourceSets = [sourceSets.main]
+}

build-logic/src/main/groovy/org.igniterealtime.smack.application-conventions.gradle

@@ -0,0 +1,12 @@
+plugins {
+	id 'application'
+}
+
+application {
+	applicationDefaultJvmArgs = ["-enableassertions"]
+}
+
+run {
+	// Pass all system properties down to the "application" run
+	systemProperties System.getProperties()
+}

build-logic/src/main/groovy/org.igniterealtime.smack.global-conventions.gradle

@@ -0,0 +1,37 @@
+ext {
+	javaVersion = JavaVersion.VERSION_11
+	javaMajor = javaVersion.getMajorVersion()
+	smackMinAndroidSdk = 23
+
+	androidBootClasspath = { getAndroidRuntimeJar() }
+}
+
+repositories {
+	mavenLocal()
+	mavenCentral()
+}
+
+def getAndroidRuntimeJar() {
+	def androidApiLevel = ext.smackMinAndroidSdk
+	def androidHome = getAndroidHome()
+	def androidJar = new File("$androidHome/platforms/android-${androidApiLevel}/android.jar")
+	if (androidJar.isFile()) {
+		return androidJar
+	} else {
+		throw new Exception("Can't find android.jar for API level ${androidApiLevel}. Please install corresponding SDK platform package")
+	}
+}
+def getAndroidJavadocOffline() {
+	def androidHome = getAndroidHome()
+	return androidHome.toString() + "/docs/reference"
+}
+
+def getAndroidHome() {
+	def androidHomeEnv = System.getenv("ANDROID_HOME")
+	if (androidHomeEnv == null) {
+		throw new Exception("ANDROID_HOME environment variable is not set")
+	}
+	def androidHome = new File(androidHomeEnv)
+	if (!androidHome.isDirectory()) throw new Exception("Environment variable ANDROID_HOME is not pointing to a directory")
+	return androidHome
+}

build-logic/src/main/groovy/org.igniterealtime.smack.java-common-conventions.gradle

@@ -0,0 +1,367 @@
+plugins {
+	id 'biz.aQute.bnd.builder'
+	id 'checkstyle'
+	id 'eclipse'
+	id 'idea'
+	id 'jacoco'
+	id 'java'
+	id 'java-library'
+	id 'java-test-fixtures'
+	id 'maven-publish'
+	id 'net.ltgt.errorprone'
+	id 'signing'
+
+	id 'jacoco-report-aggregation'
+	id 'test-report-aggregation'
+
+	id 'org.igniterealtime.smack.global-conventions'
+	id 'org.igniterealtime.smack.javadoc-conventions'
+}
+
+version readVersionFile()
+
+ext {
+	isSnapshot = version.endsWith('-SNAPSHOT')
+	gitCommit = getGitCommit()
+	rootConfigDir = new File(rootDir, 'config')
+	sonatypeCredentialsAvailable = project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePassword')
+	isReleaseVersion = !isSnapshot
+	isContinuousIntegrationEnvironment = Boolean.parseBoolean(System.getenv('CI'))
+	signingRequired = !(isSnapshot || isContinuousIntegrationEnvironment)
+	sonatypeSnapshotUrl = 'https://oss.sonatype.org/content/repositories/snapshots'
+	sonatypeStagingUrl = 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
+	builtDate = (new java.text.SimpleDateFormat("yyyy-MM-dd")).format(new Date())
+	oneLineDesc = 'An Open Source XMPP (Jabber) client library'
+
+	jxmppVersion = '[1.1.0-beta1, 1.1.999]'
+	miniDnsVersion = '[1.1.0-alpha3, 1.1.999]'
+	junitVersion = '5.9.2'
+	commonsIoVersion = '2.6'
+	bouncyCastleVersion = '1.73'
+	guavaVersion = '30.1-jre'
+	mockitoVersion = '5.13.0'
+	orgReflectionsVersion = '0.9.11'
+
+	if (project.hasProperty("useSonatype")) {
+		useSonatype = project.getProperty("useSonatype").toBoolean()
+	} else {
+		// Default to true
+		useSonatype = true
+	}
+
+	gplLicensedProjects = [
+			':smack-examples',
+			':smack-omemo-signal',
+			':smack-omemo-signal-integration-test',
+			':smack-repl'
+		].collect{ project(it) }
+}
+
+group = 'org.igniterealtime.smack'
+
+java {
+	sourceCompatibility = javaVersion
+	targetCompatibility = sourceCompatibility
+}
+
+eclipse {
+	classpath {
+		downloadJavadoc = true
+	}
+}
+
+// Make all project's 'test' target depend on javadoc, so that
+// javadoc is also linted.
+test.dependsOn javadoc
+
+tasks.withType(JavaCompile) {
+	// Some systems may not have set their platform default
+	// converter to 'utf8', but we use unicode in our source
+	// files. Therefore ensure that javac uses unicode
+	options.encoding = "utf8"
+	options.compilerArgs = [
+		'-Xlint:all',
+		// Set '-options' because a non-java7 javac will emit a
+		// warning if source/target is set to 1.7 and
+		// bootclasspath is *not* set.
+		'-Xlint:-options',
+		// TODO: Enable xlint serial
+		'-Xlint:-serial',
+		'-Werror',
+	]
+}
+if (JavaVersion.current().isJava8Compatible()) {
+	tasks.withType(Javadoc) {
+		// The '-quiet' as second argument is actually a hack,
+		// since the one parameter addStringOption doesn't seem to
+		// work, we extra add '-quiet', which is added anyway by
+		// gradle.
+		// We disable 'missing' as we do most of javadoc checking via checkstyle.
+		options.addStringOption('Xdoclint:all,-missing', '-quiet')
+		// Abort on javadoc warnings.
+		// See JDK-8200363 (https://bugs.openjdk.java.net/browse/JDK-8200363)
+		// for information about the -Xwerror option.
+		options.addStringOption('Xwerror', '-quiet')
+	}
+}
+
+if (JavaVersion.current().isJava9Compatible()) {
+	tasks.withType(JavaCompile) {
+		options.compilerArgs.addAll([
+			'--release', javaMajor,
+		])
+	}
+}
+
+jacoco {
+	toolVersion = "0.8.12"
+}
+
+jacocoTestReport {
+	dependsOn test
+	reports {
+		xml.required = true
+	}
+}
+
+dependencies {
+	testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
+	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
+
+	testFixturesApi "org.junit.jupiter:junit-jupiter-api:$junitVersion"
+	testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
+	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
+	// https://stackoverflow.com/a/77274251/194894
+	testRuntimeOnly "org.junit.platform:junit-platform-launcher:1.11.0"
+
+	// The smack-extensions subproject uses mockito in its fest
+	// fixtures, and we want to have mockito also available in
+	// test, so we use API here.
+	testFixturesApi "org.mockito:mockito-core:${mockitoVersion}"
+
+	testImplementation 'com.jamesmurty.utils:java-xmlbuilder:1.2'
+
+	errorprone 'com.google.errorprone:error_prone_core:2.32.0'
+}
+
+test {
+	useJUnitPlatform()
+
+	maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: 1
+
+	// Enable full stacktraces of failed tests. Especially handy
+	// for CI environments.
+	testLogging {
+		events "failed"
+		exceptionFormat "full"
+	}
+}
+
+jar {
+	manifest {
+		attributes(
+			'Implementation-Version': version,
+			'Implementation-GitRevision': gitCommit,
+			'Built-JDK': System.getProperty('java.version'),
+			'Built-Gradle': gradle.gradleVersion,
+			'Built-By': System.getProperty('user.name')
+		)
+	}
+
+	bundle {
+		bnd(
+				'-removeheaders': 'Tool, Bnd-*',
+				'-exportcontents': '*',
+		)
+	}
+}
+
+checkstyle {
+	toolVersion = '8.27'
+
+	if (project in gplLicensedProjects) {
+		configProperties.checkstyleLicenseHeader = "${project.name}-gplv3-license-header"
+	} else {
+		configProperties.checkstyleLicenseHeader = "header"
+	}
+}
+task sourcesJar(type: Jar, dependsOn: classes) {
+	archiveClassifier = 'sources'
+	from sourceSets.main.allSource
+}
+task javadocJar(type: Jar, dependsOn: javadoc) {
+	archiveClassifier = 'javadoc'
+	from javadoc.destinationDir
+}
+task testsJar(type: Jar) {
+	archiveClassifier = 'tests'
+	from sourceSets.test.output
+}
+configurations {
+	testRuntime
+}
+artifacts {
+	// Add a 'testRuntime' configuration including the tests so that
+	// it can be consumed by other projects (smack-omemo-signal for
+	// example).  See http://stackoverflow.com/a/21946676/194894
+	testRuntime testsJar
+}
+
+publishing {
+	publications {
+		mavenJava(MavenPublication) {
+			from components.java
+			artifact sourcesJar
+			artifact javadocJar
+			artifact testsJar
+			pom {
+				name = 'Smack'
+				packaging = 'jar'
+				inceptionYear = '2003'
+				url = 'http://www.igniterealtime.org/projects/jxmpp/'
+				afterEvaluate {
+					description = project.description
+				}
+
+				issueManagement {
+					system = 'JIRA'
+					url = 'http://issues.igniterealtime.org/browse/SMACK'
+				}
+
+				scm {
+					url = 'https://github.com/igniterealtime/Smack'
+					connection = 'scm:git:https://github.com/igniterealtime/Smack.git'
+					developerConnection = 'scm:git:https://github.com/igniterealtime/Smack.git'
+				}
+
+				licenses {
+					if (project in gplLicensedProjects) {
+						license {
+							name = 'GNU General Public License, version 3 or any later version'
+							url = 'https://www.gnu.org/licenses/gpl.txt'
+							distribution = 'repo'
+						}
+					} else {
+						license {
+							name = 'The Apache Software License, Version 2.0'
+							url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+							distribution = 'repo'
+						}
+					}
+				}
+
+				developers {
+					developer {
+						id = 'flow'
+						name = 'Florian Schmaus'
+						email = 'flow@igniterealtime.org'
+					}
+				}
+			}
+		}
+	}
+	repositories {
+		if (sonatypeCredentialsAvailable && useSonatype) {
+			maven {
+				url isSnapshot ? sonatypeSnapshotUrl : sonatypeStagingUrl
+				credentials {
+					username = sonatypeUsername
+					password = sonatypePassword
+				}
+			}
+		}
+		// Use
+		// gradle publish -P customRepoUrl=https://www.igniterealtime.org/archiva/repository/maven -P customRepoUsername=bamboo -P customRepoPassword=hidden -P useSonatype=false
+		// to deploy to this repo.
+		if (project.hasProperty("customRepoUrl")) {
+			maven {
+				name 'customRepo'
+				url customRepoUrl
+				if (project.hasProperty("customRepoUsername")) {
+					credentials {
+						username customRepoUsername
+						password customRepoPassword
+					}
+				}
+			}
+		}
+	}
+}
+
+// Workaround for gpg signatory not supporting the 'required' option
+// See https://github.com/gradle/gradle/issues/5064#issuecomment-381924984
+// Note what we use 'signing.gnupg.keyName' instead of 'signing.keyId'.
+tasks.withType(Sign) {
+	onlyIf {
+		project.hasProperty('signing.gnupg.keyName')
+	}
+}
+signing {
+	required { signingRequired }
+	useGpgCmd()
+	sign publishing.publications.mavenJava
+}
+
+tasks.withType(JavaCompile) {
+	options.errorprone {
+		disableWarningsInGeneratedCode = true
+		excludedPaths = ".*/jmh_generated/.*"
+		error(
+			"UnusedVariable",
+			"UnusedMethod",
+			"MethodCanBeStatic",
+		)
+		errorproneArgs = [
+			// Disable MissingCasesInEnumSwitch error prone check
+			// because this check is already done by javac as incomplete-switch.
+			'-Xep:MissingCasesInEnumSwitch:OFF',
+			'-Xep:StringSplitter:OFF',
+			'-Xep:JavaTimeDefaultTimeZone:OFF',
+			'-Xep:InlineMeSuggester:OFF',
+		]
+	}
+}
+
+// Work around https://github.com/gradle/gradle/issues/4046
+task copyJavadocDocFiles(type: Copy) {
+	from('src/javadoc')
+	into 'build/docs/javadoc'
+	include '**/doc-files/*.*'
+}
+javadoc.dependsOn copyJavadocDocFiles
+
+def getGitCommit() {
+	def projectDirFile = new File("$projectDir")
+
+	def cmd = 'git describe --always --tags --dirty=+'
+	def proc = cmd.execute(null, projectDirFile)
+
+	def exitStatus = proc.waitFor()
+	if (exitStatus != 0) return "non-git build"
+
+	def gitCommit = proc.text.trim()
+	assert !gitCommit.isEmpty()
+	gitCommit
+}
+
+def getAndroidRuntimeJar() {
+	def androidHome = new File("$System.env.ANDROID_HOME")
+	if (!androidHome.isDirectory()) throw new Exception("ANDROID_HOME not found or set")
+	def androidJar = new File("$androidHome/platforms/android-$smackMinAndroidSdk/android.jar")
+	if (androidJar.isFile()) {
+		return androidJar
+	} else {
+		throw new Exception("Can't find android.jar for $smackMinAndroidSdk API. Please install corresponding SDK platform package")
+	}
+}
+
+def readVersionFile() {
+	def versionFile = new File(rootDir, 'version')
+	if (!versionFile.isFile()) {
+		throw new Exception("Could not find version file")
+	}
+	if (versionFile.text.isEmpty()) {
+		throw new Exception("Version file does not contain a version")
+	}
+	versionFile.text.trim()
+}

build-logic/src/main/groovy/org.igniterealtime.smack.javadoc-conventions.gradle

@@ -0,0 +1,30 @@
+plugins {
+	// Javadoc linking requires repositories to bet configured. And
+	// those are declared in global-conventions, hence we add it here.
+	id 'org.igniterealtime.smack.global-conventions'
+}
+
+if (JavaVersion.current().isJava8Compatible()) {
+	tasks.withType(Javadoc) {
+		// The '-quiet' as second argument is actually a hack,
+		// since the one parameter addStringOption doesn't seem to
+		// work, we extra add '-quiet', which is added anyway by
+		// gradle.
+		// We disable 'missing' as we do most of javadoc checking via checkstyle.
+		options.addStringOption('Xdoclint:all,-missing', '-quiet')
+		// Abort on javadoc warnings.
+		// See JDK-8200363 (https://bugs.openjdk.java.net/browse/JDK-8200363)
+		// for information about the -Xwerror option.
+		options.addStringOption('Xwerror', '-quiet')
+	}
+}
+
+if (JavaVersion.current().isJava9Compatible()) {
+	tasks.withType(Javadoc) {
+		options.addStringOption('-release', javaMajor)
+	}
+}
+
+tasks.withType(Javadoc) {
+	options.charSet = "UTF-8"
+}

build.gradle

@@ -1,347 +1,20 @@
-buildscript {
-    repositories {
-        jcenter()
-		maven { url 'https://plugins.gradle.org/m2/' }
-        maven { url 'https://dl.bintray.com/content/aalmiray/kordamp' }
-    }
-    dependencies {
-		classpath 'org.kordamp.gradle:clirr-gradle-plugin:0.2.2'
-		classpath "biz.aQute.bnd:biz.aQute.bnd.gradle:6.0.0"
-    }
-}
-
 plugins {
-    id 'ru.vyarus.animalsniffer' version '1.5.0'
-	id 'net.ltgt.errorprone' version '1.3.0'
-	// Use e.g. "gradle <task> taskTree" to show its dependency tree.
-	id 'com.dorongold.task-tree' version '1.5'
-	id 'com.github.kt3k.coveralls' version '2.10.2'
+	// The scalastyle plugin of smack-repl wants the root project to
+	// have a ideaProject task, so let's add one.
+	id 'idea'
+
+	id 'org.igniterealtime.smack.javadoc-conventions'
 }
 
 ext {
-	java11Projects = [
+	javadocAllDir = new File(buildDir, 'javadoc')
+	integrationTestProjects = [
 		':smack-integration-test',
 		':smack-omemo-signal-integration-test',
-		':smack-repl',
-		':smack-websocket-java11',
-	].collect { project(it) }
-	java11Projects += getRootProject()
-	java8Projects = allprojects - java11Projects
+	].collect{ project(it) }
+	javadocAllProjects = subprojects - integrationTestProjects
 }
 
-configure (java8Projects) {
-	ext {
-		javaCompatilibity = JavaVersion.VERSION_1_8
-	}
-}
-
-configure (java11Projects) {
-	ext {
-		javaCompatilibity = JavaVersion.VERSION_11
-	}
-}
-
-allprojects {
-	apply plugin: 'java-library'
-	apply plugin: 'java-test-fixtures'
-	apply plugin: 'eclipse'
-	apply plugin: 'idea'
-	apply plugin: 'jacoco'
-	apply plugin: 'net.ltgt.errorprone'
-
-	version readVersionFile()
-
-	ext {
-		isSnapshot = version.endsWith('-SNAPSHOT')
-		gitCommit = getGitCommit()
-		javadocAllDir = new File(buildDir, 'javadoc')
-		documentationDir = new File(projectDir, 'documentation')
-		releasedocsDir = new File(buildDir, 'releasedocs')
-		rootConfigDir = new File(rootDir, 'config')
-		sonatypeCredentialsAvailable = project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePassword')
-		isReleaseVersion = !isSnapshot
-		isContinuousIntegrationEnvironment = Boolean.parseBoolean(System.getenv('CI'))
-		signingRequired = !(isSnapshot || isContinuousIntegrationEnvironment)
-		sonatypeSnapshotUrl = 'https://oss.sonatype.org/content/repositories/snapshots'
-		sonatypeStagingUrl = 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
-		// Returns only the date in yyyy-MM-dd format, as otherwise, with
-		// hh:mm:ss information, the manifest files would change with every
-		// build, causing unnecessary rebuilds.
-		builtDate = (new java.text.SimpleDateFormat("yyyy-MM-dd")).format(new Date())
-		oneLineDesc = 'An Open Source XMPP (Jabber) client library'
-		integrationTestProjects = [
-			':smack-integration-test',
-			':smack-omemo-signal-integration-test',
-		].collect{ project(it) }
-		javadocAllProjects = subprojects - integrationTestProjects
-		// A dirty hack used for Gradle's jacoco plugin, since is not
-		// hable to handle the case when a (sub)project has no unit
-		// tests. :-(
-		projectsWithoutUnitTests = [
-			':smack-android',
-			':smack-android-extensions',
-			':smack-bosh',
-			':smack-debug',
-			':smack-debug-slf4j',
-			':smack-java8',
-			':smack-jingle-old',
-			':smack-resolver-dnsjava',
-			':smack-resolver-javax',
-			':smack-resolver-minidns',
-			':smack-omemo-signal-integration-test',
-		].collect{ project(it) }
-		projectsWithUnitTests = subprojects - projectsWithoutUnitTests
-		androidProjects = [
-			':smack-tcp',
-			':smack-bosh',
-			':smack-core',
-			':smack-im',
-			':smack-resolver-minidns',
-			':smack-sasl-provided',
-			':smack-extensions',
-			':smack-experimental',
-			':smack-omemo',
-			':smack-omemo-signal',
-			':smack-openpgp',
-			':smack-xmlparser',
-			':smack-xmlparser-xpp3',
-		].collect{ project(it) }
-		androidBootClasspathProjects = [
-			':smack-android',
-			':smack-android-extensions',
-		].collect{ project(it) }
-		androidOptionalProjects = [
-			':smack-tcp',
-			':smack-extensions',
-			':smack-experimental',
-			':smack-bosh',
-			':smack-omemo',
-			':smack-omemo-signal',
-		].collect{ project(it) }
-		gplLicensedProjects = [
-			':smack-omemo-signal',
-			':smack-omemo-signal-integration-test',
-			':smack-repl'
-		].collect{ project(it) }
-		// Lazily evaluate the Android bootClasspath and offline
-		// Javadoc using a closure, so that targets which do not
-		// require it are still able to succeed without an Android
-		// SDK.
-		androidBootClasspath = { getAndroidRuntimeJar() }
-		androidJavadocOffline = { getAndroidJavadocOffline() }
-		junit4Projects = [
-			':smack-core',
-			':smack-im',
-			':smack-omemo',
-			':smack-omemo-signal',
-			':smack-openpgp',
-		].collect { project(it) }
-
-		// When using dynamic versions for those, do *not* use [1.0,
-		// 2.0), since this will also pull in 2.0-alpha1. Instead use
-		// [1.0, 1.0.99].
-		// See also:
-		// - https://issues.apache.org/jira/browse/MNG-6232
-		// - https://issues.igniterealtime.org/browse/SMACK-858
-		jxmppVersion = '[1.0.0, 1.0.999]'
-		miniDnsVersion = '[1.0.0, 1.0.999]'
-		smackMinAndroidSdk = 19
-		junitVersion = '5.7.1'
-		commonsIoVersion = '2.6'
-		bouncyCastleVersion = '1.71'
-		guavaVersion = '30.1-jre'
-		mockitoVersion = '3.7.7'
-		orgReflectionsVersion = '0.9.11'
-
-		if (project.hasProperty("useSonatype")) {
-			useSonatype = project.getProperty("useSonatype").toBoolean()
-		} else {
-			// Default to true
-			useSonatype = true
-		}
-		javaMajor = javaCompatilibity.getMajorVersion()
-	}
-	group = 'org.igniterealtime.smack'
-	sourceCompatibility = javaCompatilibity
-	targetCompatibility = sourceCompatibility
-
-	test {
-		useJUnitPlatform()
-
-		maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: 1
-
-		// Enable full stacktraces of failed tests. Especially handy
-		// for environments like Travis.
-		testLogging {
-			events "failed"
-			exceptionFormat "full"
-		}
-	}
-
-	ext.sharedManifest = manifest {
-		attributes('Implementation-Version': version,
-				   'Implementation-GitRevision': ext.gitCommit,
-				   'Built-Date': ext.builtDate,
-				   'Built-JDK': System.getProperty('java.version'),
-				   'Built-Gradle': gradle.gradleVersion,
-				   'Built-By': System.getProperty('user.name')
-				  )
-	}
-
-	eclipse {
-		classpath {
-			downloadJavadoc = true
-		}
-	}
-
-	repositories {
-		mavenLocal()
-		mavenCentral()
-	}
-
-	tasks.withType(JavaCompile) {
-		// Some systems may not have set their platform default
-		// converter to 'utf8', but we use unicode in our source
-		// files. Therefore ensure that javac uses unicode
-		options.encoding = 'UTF-8'
-		options.compilerArgs = [
-			'-Xlint:all',
-			// Set '-options' because a non-java7 javac will emit a
-			// warning if source/traget is set to 1.7 and
-			// bootclasspath is *not* set.
-			// TODO implement a sound heuristic to determine a java7
-			// rt.jar on the build host. And if none is found,
-			// fallback to using a environment variable,
-			// e.g. JAVA7_HOME. See SMACK-651.
-			'-Xlint:-options',
-			'-Werror',
-		]
-		options.errorprone {
-			error(
-				"UnusedVariable",
-				"UnusedMethod",
-				"MethodCanBeStatic",
-			)
-			errorproneArgs = [
-				// Disable errorprone checks
-				'-Xep:TypeParameterUnusedInFormals:OFF',
-				// Disable errorpone StringSplitter check, as it
-				// recommends using Splitter from Guava, which we don't
-				// have (nor want to use in Smack).
-				'-Xep:StringSplitter:OFF',
-				'-Xep:JdkObsolete:OFF',
-				// Disabled because sinttest re-uses BeforeClass from junit.
-				// TODO: change sinttest so that it has it's own
-				// BeforeClass and re-enable this check.
-				'-Xep:JUnit4ClassAnnotationNonStatic:OFF',
-				// Disabled but should be re-enabled at some point
-				//'-Xep:InconsistentCapitalization:OFF',
-				'-Xep:MixedMutabilityReturnType:OFF',
-				// TODO: Re-enable once Smack's minimum Android SDK level is 26 or higher.
-				'-Xep:JavaUtilDate:OFF',
-			]
-		}
-	}
-
-	tasks.withType(ScalaCompile) {
-		scalaCompileOptions.additionalParameters = [
-			'-Xfatal-warnings',
-			'-feature',
-		]
-	}
-
-	jacoco {
-		toolVersion = "0.8.6"
-	}
-
-	jacocoTestReport {
-		dependsOn test
-		getSourceDirectories().setFrom(project.files(sourceSets.main.allSource.srcDirs))
-		getClassDirectories().setFrom(project.files(sourceSets.main.output))
-		reports {
-			xml.enabled true
-		}
-	}
-
-	if (JavaVersion.current().isJava8Compatible()) {
-		tasks.withType(Javadoc) {
-			// The '-quiet' as second argument is actually a hack,
-			// since the one paramater addStringOption doesn't seem to
-			// work, we extra add '-quiet', which is added anyway by
-			// gradle.
-			// TODO: This enables all doclint check but
-			// 'missing'. Re-enable 'missing' once every public API in
-			// Smack has a javadoc comment.
-			options.addStringOption('Xdoclint:accessibility,html,reference,syntax', '-quiet')
-
-			// Treat warnings as errors.
-			// See also https://bugs.openjdk.java.net/browse/JDK-8200363
-			options.addStringOption('Xwerror', '-quiet')
-		}
-	}
-
-	if (JavaVersion.current().isJava9Compatible()) {
-		tasks.withType(Javadoc) {
-			options.addStringOption('-release', javaMajor)
-
-			// The -no-modules-directories javadoc option was removed in Java 13
-			// See https://bugs.openjdk.java.net/browse/JDK-8215582
-			if (JavaVersion.current() < JavaVersion.VERSION_13) {
-				// Fix for javadoc search. If not set, the search result would direct to
-				// javadoc/undefined/org/jivesoftware/smack/altconnections/HttpLookupMethod.html
-				// instead of
-				// javadoc/org/jivesoftware/smack/altconnections/HttpLookupMethod.html
-				// https://stackoverflow.com/a/53732633/194894
-				options.addBooleanOption("-no-module-directories", true)
-			}
-		}
-		tasks.withType(JavaCompile) {
-			options.compilerArgs.addAll([
-				'--release', javaMajor,
-			])
-		}
-	}
-
-tasks.withType(Javadoc) {
-		options.charSet = "UTF-8"
-		options.encoding = 'UTF-8'
-	}
-
-	dependencies {
-		testFixturesApi "org.junit.jupiter:junit-jupiter-api:$junitVersion"
-		testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
-		testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
-
-		// The smack-extensions subproject uses mockito in its fest
-		// fixtures, and we want to have mockito also available in
-		// test, so we use API here.
-		testFixturesApi "org.mockito:mockito-core:${mockitoVersion}"
-		
-		// To mock final classes
-		testImplementation "org.mockito:mockito-inline:${mockitoVersion}"
-		testImplementation 'com.jamesmurty.utils:java-xmlbuilder:1.2'
-
-		errorprone 'com.google.errorprone:error_prone_core:2.5.1'
-		errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')
-	}
-
-	// Make all project's 'test' target depend on javadoc, so that
-	// javadoc is also linted.
-	test { dependsOn javadoc }
-}
-
-configure (junit4Projects) {
-	dependencies {
-		testImplementation "org.junit.vintage:junit-vintage-engine:$junitVersion"
-	}
-}
-
-// We need to evaluate the child projects first because
-// - javadocAll needs the smack-core child to have already resolved
-//   the jXMPP/MiniDNS dependencies, so that we can the resovled
-//   version to link to those project's javadoc.
-// - We use the child's project description as description for the
-//   Maven POM.
 evaluationDependsOnChildren()
 task javadocAll(type: Javadoc) {
 	source javadocAllProjects.collect {project ->
@@ -390,315 +63,6 @@ task javadocAll(type: Javadoc) {
 	}
 }
 
-import org.apache.tools.ant.filters.ReplaceTokens
-task prepareReleasedocs(type: Copy) {
-	from 'resources/releasedocs'
-	into releasedocsDir
-	filter(ReplaceTokens, tokens: [version: version, releasedate: builtDate, targetCompatibility: targetCompatibility.toString()])
-}
-
-task distributionZip(type: Zip, dependsOn: [javadocAll, prepareReleasedocs]) {
-	classifier builtDate
-	into ('javadoc') {
-		from(javadocAllDir)
-	}
-	into ('releasedocs') {
-		from(releasedocsDir)
-	}
-	into ('releasedocs/documentation') {
-		from(documentationDir)
-	}
-}
-
-task maybeCheckForSnapshotDependencies {
-	// Don't check for Snapshot dependencies if this is a snapshot.
-	onlyIf { isReleaseVersion }
-	// Run in the execution phase, not in configuration phase, as the
-	// 'each' forces the runtime configuration to be resovled, which
-	// causes "Cannot change dependencies of configuration after it
-	// has been included in dependency resolution." errors.
-	// See https://discuss.gradle.org/t/23153
-	doLast {
-		allprojects { project ->
-			project.configurations.runtime.each {
-				if (it.toString().contains("-SNAPSHOT"))
-					throw new Exception("Release build contains snapshot dependencies: " + it)
-			}
-		}
-	}
-}
-
-test { dependsOn maybeCheckForSnapshotDependencies }
-
-jar {
-	// Root project should not create empty jar artifact
-	enabled = false
-}
-
-// Disable upload archives for the root project
-uploadArchives.enabled = false
-
-description = """\
-Smack ${version}
-${oneLineDesc}."""
-
-subprojects {
-	apply plugin: 'maven-publish'
-	apply plugin: 'signing'
-	apply plugin: 'checkstyle'
-	apply plugin: 'org.kordamp.gradle.clirr'
-	apply plugin: 'biz.aQute.bnd.builder'
-
-	checkstyle {
-		toolVersion = '8.27'
-	}
-	task sourcesJar(type: Jar, dependsOn: classes) {
-		classifier = 'sources'
-		from sourceSets.main.allSource
-	}
-	task javadocJar(type: Jar, dependsOn: javadoc) {
-		classifier = 'javadoc'
-		from javadoc.destinationDir
-	}
-	task testsJar(type: Jar, dependsOn: testClasses) {
-		classifier = 'tests'
-		from sourceSets.test.output
-	}
-
-	artifacts {
-		// See http://stackoverflow.com/a/21946676/194894
-		testRuntime testsJar
-	}
-
-	publishing {
-		publications {
-			mavenJava(MavenPublication) {
-				from components.java
-				artifact sourcesJar
-				artifact javadocJar
-				artifact testsJar
-				pom {
-					name = 'Smack'
-					packaging = 'jar'
-					inceptionYear = '2003'
-					url = 'http://www.igniterealtime.org/projects/smack/'
-					description = project.description
-
-					issueManagement {
-						system = 'JIRA'
-						url = 'https://igniterealtime.org/issues/browse/SMACK'
-					}
-
-					scm {
-						url = 'https://github.com/igniterealtime/Smack'
-						connection =  'scm:git:https://github.com/igniterealtime/Smack.git'
-						developerConnection =  'scm:git:https://github.com/igniterealtime/Smack.git'
-					}
-
-					developers {
-						developer {
-							id = 'flow'
-							name = 'Florian Schmaus'
-							email = 'flow@igniterealtime.org'
-						}
-					}
-				}
-			}
-		}
-		repositories {
-			if (sonatypeCredentialsAvailable && useSonatype) {
-				maven {
-					url isSnapshot ? sonatypeSnapshotUrl : sonatypeStagingUrl
-					credentials {
-						username = sonatypeUsername
-						password = sonatypePassword
-					}
-				}
-			}
-			// Use
-			// gradle publish -P customRepoUrl=https://www.igniterealtime.org/archiva/repository/maven -P customRepoUsername=bamboo -P customRepoPassword=hidden -P useSonatype=false
-			// to deploy to this repo.
-			if (project.hasProperty("customRepoUrl")) {
-				maven {
-					name 'customRepo'
-					url customRepoUrl
-					if (project.hasProperty("customRepoUsername")) {
-						credentials {
-							username customRepoUsername
-							password customRepoPassword
-						}
-					}
-				}
-			}
-		}
-	}
-	rootProject.distributionZip {
-		dependsOn build
-		from(buildDir) {
-			include "$libsDirName/*${version}.jar"
-			include "$libsDirName/*${version}-javadoc.jar"
-			include "$libsDirName/*${version}-sources.jar"
-		}
-	}
-
-	// Workaround for gpg signatory not supporting the 'required' option
-	// See https://github.com/gradle/gradle/issues/5064#issuecomment-381924984
-	// Note what we use 'signing.gnupg.keyName' instead of 'signing.keyId'.
-	tasks.withType(Sign) {
-		onlyIf {
-			project.hasProperty('signing.gnupg.keyName')
-		}
-	}
-	signing {
-		useGpgCmd()
-		required { signingRequired }
-		sign publishing.publications.mavenJava
-	}
-
-	clirr {
-		// 2018-08-14: Disabled Clirr because
-		// - It reports an breaking change in android.jar (seems right, but there is nothing we can do about it)
-		// - Only the first smack-* projects are correctly checked,
-		//   the other ones have the output of a clirr report from a previous project
-		//   (Look at the clirr reports).
-		enabled false
-		semver false
-	}
-
-	// Work around https://github.com/gradle/gradle/issues/4046
-	task copyJavadocDocFiles(type: Copy) {
-		from('src/javadoc')
-		into 'build/docs/javadoc'
-		include '**/doc-files/*.*'
-	}
-	javadoc.dependsOn copyJavadocDocFiles
-
-	// Make sure root projects 'javadocAll' depends on the
-	// subproject's javadoc, to ensure that all all doc-files/ are
-	// generated and up-to-date. Obviously this means that the
-	// javadocAll task will also create the individual javadoc's of the
-	// subprojects.
-	javadocAll.dependsOn javadoc
-}
-
-// The smack-java8-full project generates the dot and png files of the
-// current state graph. Ensure they are generated before copied.
-configure (project(':smack-java8-full')) {
-	copyJavadocDocFiles.dependsOn convertModularXmppClientToServerConnectionStateGraphDotToPng
-}
-
-configure (androidProjects + androidBootClasspathProjects) {
-	apply plugin: 'ru.vyarus.animalsniffer'
-	dependencies {
-		signature "net.sf.androidscents.signature:android-api-level-${smackMinAndroidSdk}:4.4.2_r4@signature"
-	}
-	animalsniffer {
-		sourceSets = [sourceSets.main]
-	}
-}
-
-// There is no need to ever clirr integration test projects and the
-// smack-repl project.
-configure(integrationTestProjects + project(':smack-repl')) {
-	clirr {
-		enabled false
-	}
-}
-
-// Disable clirr on omemo modules
-project(':smack-omemo').clirr.enabled = false
-project(':smack-omemo-signal').clirr.enabled = false
-
-subprojects*.jar {
-	manifest {
-		from sharedManifest
-	}
-	bundle {
-		bnd(
-				'-removeheaders': 'Tool, Bnd-*',
-				'-exportcontents': '*',
-		)
-	}
-}
-
-configure(subprojects - gplLicensedProjects) {
-	checkstyle {
-		configProperties.checkstyleLicenseHeader = "header"
-	}
-	publishing {
-		publications {
-			mavenJava(MavenPublication) {
-				pom {
-					licenses {
-						license {
-							name = 'The Apache Software License, Version 2.0'
-							url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
-							distribution = 'repo'
-						}
-					}
-				}
-			}
-		}
-	}
-}
-
-configure(gplLicensedProjects) {
-	checkstyle {
-		configProperties.checkstyleLicenseHeader = "${project.name}-gplv3-license-header"
-	}
-	publishing {
-		publications {
-			mavenJava(MavenPublication) {
-				pom {
-					licenses {
-						license {
-							name = 'GNU General Public License, version 3 or any later version'
-							url = 'https://www.gnu.org/licenses/gpl.txt'
-							distribution = 'repo'
-						}
-					}
-				}
-			}
-		}
-	}
-}
-
-configure(androidBootClasspathProjects) {
-	compileJava {
-		options.bootstrapClasspath = files(androidBootClasspath)
-	}
-	javadoc {
-		classpath += files(androidBootClasspath)
-	}
-}
-
-apply plugin: "com.github.kt3k.coveralls"
-coveralls {
-	sourceDirs = files(subprojects.sourceSets.main.allSource.srcDirs).files.absolutePath
-}
-
-task jacocoRootReport(type: org.gradle.testing.jacoco.tasks.JacocoReport) {
-	dependsOn = projectsWithUnitTests.jacocoTestReport
-	getSourceDirectories().setFrom(files(projectsWithUnitTests.sourceSets.main.allSource.srcDirs))
-	getClassDirectories().setFrom(files(projectsWithUnitTests.sourceSets.main.output))
-	getExecutionData().setFrom(files(projectsWithUnitTests.jacocoTestReport.executionData))
-	reports {
-		xml.enabled true
-		xml.destination file("${buildDir}/reports/jacoco/test/jacocoTestReport.xml")
-	}
-	// We could remove the following setOnlyIf line, but then
-	// jacocoRootReport would silently be SKIPPED if something with
-	// the projectsWithUnitTests is wrong (e.g. a project is missing
-	// in there).
-	setOnlyIf { true }
-}
-
-// Important to specify this task after the subprojects block
-task clirrRootReport(type: org.kordamp.gradle.clirr.ClirrReportTask) {
-	dependsOn = subprojects.tasks.clirr
-	reports = files((subprojects.findAll { it.clirr.enabled == true }).tasks.clirr.xmlReport)
-}
-
 task integrationTest {
 	description 'Verify correct functionality of Smack by running some integration tests.'
 	dependsOn project(':smack-integration-test').tasks.run
@@ -706,7 +70,7 @@ task integrationTest {
 
 task omemoSignalIntTest {
 	description 'Run integration tests of the smack-omemo module in combination with smack-omemo-signal.'
-	dependsOn project(':smack-omemo-signal-integration-test').tasks.run
+	dependsOn 'smack-omemo-signal-integration-test:run'
 }
 
 task sinttestAll {
@@ -717,70 +81,6 @@ task sinttestAll {
 	]}
 }
 
-def getGitCommit() {
-	def projectDirFile = new File("$projectDir")
-	def dotGit = new File(projectDirFile, ".git")
-	if (!dotGit.isDirectory()) return 'non-git build'
-
-	def cmd = 'git describe --always --tags --dirty=+'
-	def proc = cmd.execute(null, projectDirFile)
-	proc.waitForOrKill(10 * 1000)
-
-	def gitCommit = proc.text.trim()
-	assert !gitCommit.isEmpty()
-
-    def srCmd = 'git symbolic-ref --short HEAD'
-    def srProc = srCmd.execute(null, projectDirFile)
-    srProc.waitForOrKill(10 * 1000)
-    if (srProc.exitValue() == 0) {
-        // Only add the information if the git command was
-        // successful. There may be no symbolic reference for HEAD if
-        // e.g. in detached mode.
-        def symbolicReference = srProc.text.trim()
-        assert !symbolicReference.isEmpty()
-        gitCommit += "-$symbolicReference"
-    }
-
-	gitCommit
-}
-
-def getAndroidRuntimeJar() {
-	def androidApiLevel = ext.smackMinAndroidSdk
-	def androidHome = getAndroidHome()
-	def androidJar = new File("$androidHome/platforms/android-${androidApiLevel}/android.jar")
-	if (androidJar.isFile()) {
-		return androidJar
-	} else {
-		throw new Exception("Can't find android.jar for API level ${androidApiLevel}. Please install corresponding SDK platform package")
-	}
-}
-
-def getAndroidJavadocOffline() {
-	def androidHome = getAndroidHome()
-	return androidHome.toString() + "/docs/reference"
-}
-
-def getAndroidHome() {
-	def androidHomeEnv = System.getenv("ANDROID_HOME")
-	if (androidHomeEnv == null) {
-		throw new Exception("ANDROID_HOME environment variable is not set")
-	}
-	def androidHome = new File(androidHomeEnv)
-	if (!androidHome.isDirectory()) throw new Exception("Environment variable ANDROID_HOME is not pointing to a directory")
-	return androidHome
-}
-
-def readVersionFile() {
-	def versionFile = new File(rootDir, 'version')
-	if (!versionFile.isFile()) {
-		throw new Exception("Could not find version file")
-	}
-	if (versionFile.text.isEmpty()) {
-		throw new Exception("Version file does not contain a version")
-	}
-	versionFile.text.trim()
-}
-
 def getResolvedVersion(queriedProject = 'smack-core', component) {
 	def configuration = project(queriedProject)
 		.configurations
@@ -791,7 +91,7 @@ def getResolvedVersion(queriedProject = 'smack-core', component) {
 		.resolvedArtifacts
 		.findAll {
 			// 'it' is of type ResolvedArtifact, 'id' of
-			// Component*Artifcat*Identifier, and we check the
+			// Component*Artifact*Identifier, and we check the
 			// ComponentIdentifier.
 			it.id.getComponentIdentifier() instanceof org.gradle.api.artifacts.component.ModuleComponentIdentifier
 		}

config/checkstyle/smack-examples-gplv3-license-header.txt

@@ -0,0 +1,20 @@
+/**
+ *
+ * Copyright 20XX John Doe
+ *
+ * This file is part of smack-examples.
+ *
+ * smack-examples is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ */

gradle.properties

@@ -0,0 +1,5 @@
+# Workaround for https://github.com/CycloneDX/cyclonedx-gradle-plugin/issues/349
+# suggested at https://docs.gradle.org/current/userguide/upgrading_version_8.html#xml_parsing_now_requires_recent_parsers
+systemProp.javax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl
+systemProp.javax.xml.transform.TransformerFactory=com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl
+systemProp.javax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,69 +15,104 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
 
-APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
@@ -87,9 +122,9 @@ CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -98,88 +133,120 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=`expr $i + 1`
-    done
-    case $i in
-        0) set -- ;;
-        1) set -- "$args0" ;;
-        2) set -- "$args0" "$args1" ;;
-        3) set -- "$args0" "$args1" "$args2" ;;
-        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
 fi
 
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=`save "$@"`
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
 
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -13,8 +13,10 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
-@if "%DEBUG%" == "" @echo off
+@if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
 @rem  Gradle startup script for Windows
@@ -25,7 +27,8 @@
 if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
@@ -40,13 +43,13 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
+if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -56,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -75,13 +78,15 @@ set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 :end
 @rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 0 goto mainEnd
 
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
 
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal

repl

@@ -1,7 +1,5 @@
 #!/usr/bin/env bash
-set -e
-set -u
-set -o pipefail
+set -euo pipefail
 
 JDWP=false
 JDWP_PORT=8000
@@ -37,12 +35,13 @@ echo "Compiling and computing classpath (May take a while)"
 # /smack/smack-repl/build/classes/main:/smack/smack-repl/build/
 # resources/main:/smack/smack-tcp/build/libs/smack-tcp-4.2.0-alpha4-SNAPSHOT.jar
 # So perform a "tail -n1" on the output of gradle
-GRADLE_CLASSPATH="$(gradle :smack-repl:printClasspath --quiet |\
+GRADLE_CLASSPATH="$(${GRADLE_BIN:-./gradlew} :smack-repl:printClasspath --quiet |\
 	tail -n1)"
 echo "Finished, starting REPL"
 
-java "${EXTRA_JAVA_ARGS[@]}" \
+exec java \
+	"${EXTRA_JAVA_ARGS[@]}" \
 	-Dscala.usejavacp=true \
 	-classpath "${GRADLE_CLASSPATH}" \
 	ammonite.Main \
-	--predef "smack-repl/scala.repl"
+	--predef smack-repl/scala.repl

resources/fix-a-javadoc.sh

@@ -29,7 +29,7 @@ SMACK_EXCEPTIONS[SmackException]="if Smack detected an exceptional situation."
 SMACK_EXCEPTIONS[XMPPException]="if an XMPP protocol error was received."
 SMACK_EXCEPTIONS[SmackSaslException]="if a SASL specific error occurred."
 SMACK_EXCEPTIONS[SASLErrorException]="if a SASL protocol error was returned."
-SMACK_EXCEPTIONS[NotAMucServiceException]="if the entity is not a MUC serivce."
+SMACK_EXCEPTIONS[NotAMucServiceException]="if the entity is not a MUC service."
 SMACK_EXCEPTIONS[NoSuchAlgorithmException]="if no such algorithm is available."
 SMACK_EXCEPTIONS[KeyManagementException]="if there was a key mangement error."
 SMACK_EXCEPTIONS[XmppStringprepException]="if the provided string is invalid."
@@ -53,7 +53,7 @@ SMACK_EXCEPTIONS[Exception]="if an exception occurred."
 SMACK_EXCEPTIONS[TestNotPossibleException]="if the test is not possible."
 SMACK_EXCEPTIONS[TimeoutException]="if there was a timeout."
 SMACK_EXCEPTIONS[IllegalStateException]="if an illegal state was encountered"
-SMACK_EXCEPTIONS[NoSuchPaddingException]="if the requested padding mechanism is not availble."
+SMACK_EXCEPTIONS[NoSuchPaddingException]="if the requested padding mechanism is not available."
 SMACK_EXCEPTIONS[BadPaddingException]="if the input data is not padded properly."
 SMACK_EXCEPTIONS[InvalidKeyException]="if the key is invalid."
 SMACK_EXCEPTIONS[IllegalBlockSizeException]="if the input data length is incorrect."

resources/getCopyright.sh

@@ -15,7 +15,7 @@ for p in $SUBPROJECTS; do
 		sort | \
 		# Remove duplicates
 		uniq | \
-		# Split multi Copyright statemtents, e.g. "2001-2013 FooBar, 2014 Baz"
+		# Split multi Copyright statements, e.g. "2001-2013 FooBar, 2014 Baz"
 	    tr ',' '\n' | \
 		# Remove whitespaces resulting from the previous split
 		sed "s/^[ \t]*//" | \

resources/releasedocs/README.html

@@ -1,221 +0,0 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
-
-<html>
-<head>
-	<title>Smack Readme</title>
- <style type="text/css">
-/* global font and body settings */
-body {
-	font-size : 100%;
-	background-color : #d3d6d9;
-	padding: 0;
-	margin: 0 0 30px 0;
-}
-body, td, th {
-	font-family : arial, helvetica, sans-serif;
-	font-size : 10pt;
-}
-pre, tt, code {
-	font-family : courier new, monospace;
-	font-size : 9pt;
-}
-#pageContainer {
-	display: block;
-	position: relative;
-	clear: both;
-	background-color: #fff;
-	border: 1px solid #999;
-	padding: 40px;
-	margin: 30px;
-	-moz-border-radius: 6px;
-}
-#pageHeader {
-	display: block;
-	position: relative;
-	height: 80px;
-	background-color: #e7eaee;
-	border: 1px solid #cccccc;
-	border-bottom: none;
-	-moz-border-radius: 5px 5px 0 0;
-	margin: 10px 0 0 0;
-}
-#pageBody {
-	margin: 0 18px 0 20px;
-}
-/* anchors */
-a:link {
-	color: #11568c;
-}
-a:visited {
-	color: #571c8d;
-}
-a:hover {
-	color: #7a1d42;
-	text-decoration : underline;
-}
-a:active {
-	color: #7a1d42;
-}
-/* page header elements (logo and navigation) */
-.navigation {
-	display: block;
-	position: relative;
-	height: 20px;
-	background-color: #335588;
-	border: 1px solid #cccccc;
-	border-top: none;
-	color: #ffffff;
-	font-size: 11px;
-	line-height: 18px;
-	padding: 0 0 0 0;
-	margin: 0 0 25px 0;
-	overflow: hidden;
-}
-.navigation a {
-	margin: 0 20px 0 20px;
-}
-.navigation a:link { color: #ffffff; }
-.navigation a:visited { color: #ffffff; }
-.navigation a:hover { color: #ffffff; }
-.navigation a:active { color: #ffffff; }
-/* headings */
-h1 {
-	display: block;
-	position: relative;
-	font-size : 1.7em;
-	font-weight : bold;
-	color: #670e15;
-	padding: 0;
-	margin: 30px 0 0 20px;
-}
-h2 {
-	font-size : 1.3em;
-	font-weight : bold;
-	margin: 40px 0 6px 0;
-	padding: 0;
-	color: #335588;
-}
-h3 {
-	font-size : 1.0em;
-	font-weight : bold;
-	margin: 25px 0 3px 0;
-	padding: 0;
-	color: #334466;
-}
-
-/* general elements */
-p {
-	margin: 0 0 15px 0;
-}
-
-ul {
-	margin: 5px 0 15px 15px;
-}
-li {
-	padding-bottom : 4px;
-}
-tt {
-	font-family : courier new, monospace; 
-	font-weight : bold;
-	color : #060;
-}
-hr {
-	display: block;
-	height: 1px;
-	background-color: #999999;
-	border: none;
-	margin: 40px 0 20px 0;
-}
-</style>
-</head>
-<body>
-
-<div id="pageContainer">
-
-	<div id="pageHeader">
-		<h1>Smack Readme</h1>
-	</div>
-	<div class="navigation">
-	<a href="README.html">Readme</a>|<a href="changelog.html"><strong>Changelog</strong></a>
-	</div>
-
-	<div id="pageBody">
-
-<p>
-<table border=0>
-<tr>
-	<td align="right">version:</td>
-	<td><b>@version@</b></td>
-</tr>
-<tr>
-   <td align="right">released:</td>
-   <td><b>@releasedate@</b></td>
-</tr>
-</table>
-
-<p>
-Thank you for downloading Smack! This version of Smack is compatible
-with JVMs @targetCompatibility@ or higher. Using a build system which
-is able to consume Maven artifacts, like gradle or Maven, is highly
-recommended when using Smack.
-</p>
-
-<p>
-  <b>This is not the real README.</b> Please visit
-  <center>
-	<a href="https://www.igniterealtime.org/projects/smack/readme">https://www.igniterealtime.org/projects/smack/readme</a>
-  </center>
-  for the README of the current stable Smack version.
-</p>
-
-<p>
-  Smack tries to depend on as few as possible libraries. The only
-  requirement is <a href="http://jxmpp.org">jXMPP</a>. For DNS
-  resolution we recommend to
-  use <a href="http://minidns.org">MiniDNS</a>.
-</p>
-
-<p>
-Start off by viewing the <a href="documentation/index.html">documentation</a>
-that can be found in the "documentation" directory included with this distribution.
-</p>
-Further information can be found on the <a href="http://www.igniterealtime.org/projects/smack">
-Smack website</a>. If you need help using or would like to make contributions or
-fixes to the code, please visit the 
-<a href="https://community.igniterealtime.org">online forum</a>.
-</p>
-
-<p><b>Changelog and Upgrading</b><p>
-
-View the <a href="changelog.html">changelog</a> for a list of changes since the 
-last release.
-
-<p><b>License Agreements</b><p>
-<ul>
-<li>Use of the Smack source code is governed by the Apache License Version 2.0:
-<pre>
- Copyright 2002-2008 Jive Software.
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- </pre></li> 
- 
-<li>Smack contains icons and images licensed from INCORS GmbH. You are not licensed
-to use these icons outside of Smack.</li>
-
-<li>Third-party source code is licensed as noted in their source files. 
-
-</ul>
-</div>
-</div>
-</body>
-</html>

settings.gradle

@@ -1,3 +1,7 @@
+pluginManagement {
+    includeBuild('build-logic')
+}
+
 // The name of the root project.
 // If we would not set the name, then gradle would use the directory
 // name of the root directory
@@ -6,6 +10,7 @@ rootProject.name = 'Smack'
 include 'smack-core',
 		'smack-im',
 		'smack-tcp',
+		'smack-examples',
 		'smack-extensions',
 		'smack-experimental',
 		'smack-debug',
@@ -22,8 +27,8 @@ include 'smack-core',
 		'smack-bosh',
 		'smack-android',
 		'smack-android-extensions',
-		'smack-java8',
-		'smack-java8-full',
+		'smack-java11',
+		'smack-java11-full',
 		'smack-integration-test',
 		'smack-omemo',
 		'smack-omemo-signal',

smack-android-extensions/build.gradle

@@ -1,3 +1,9 @@
+plugins {
+	id 'org.igniterealtime.smack.java-common-conventions'
+	id 'org.igniterealtime.smack.android-conventions'
+	id 'org.igniterealtime.smack.android-boot-classpath-conventions'
+}
+
 description = """\
 Extra Smack extensions for Android."""
 
@@ -8,5 +14,5 @@ dependencies {
 	api project(':smack-extensions')
 
 	// Add the Android jar to the Eclipse .classpath.
-	compileClasspath files(androidBootClasspath)
+	implementation files(androidBootClasspath)
 }

smack-android-extensions/src/main/java/org/jivesoftware/smackx/package-info.java

@@ -1 +1 @@
-../../../../../../../smack-java8-full/src/main/java/org/jivesoftware/smackx/package-info.java
+../../../../../../../smack-java11-full/src/main/java/org/jivesoftware/smackx/package-info.java

smack-android-extensions/src/main/java/org/jivesoftware/smackx/ping/android/ServerPingWithAlarmManager.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2021 Florian Schmaus
+ * Copyright © 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,6 +36,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.os.Build;
 import android.os.SystemClock;
 
 /**
@@ -121,6 +122,7 @@ public final class ServerPingWithAlarmManager extends Manager {
 
     private static final BroadcastReceiver ALARM_BROADCAST_RECEIVER = new BroadcastReceiver() {
         @Override
+        @SuppressWarnings("LockOnNonEnclosingClassLiteral")
         public void onReceive(Context context, Intent intent) {
             LOGGER.fine("Ping Alarm broadcast received");
             Set<Map.Entry<XMPPConnection, ServerPingWithAlarmManager>> managers;
@@ -163,7 +165,7 @@ public final class ServerPingWithAlarmManager extends Manager {
     private static AlarmManager sAlarmManager;
 
     /**
-     * Register a pending intent with the AlarmManager to be broadcasted every half hour and
+     * Register a pending intent with the AlarmManager to be broadcast every half hour and
      * register the alarm broadcast receiver to receive this intent. The receiver will check all
      * known questions if a ping is Necessary when invoked by the alarm intent.
      *
@@ -173,7 +175,11 @@ public final class ServerPingWithAlarmManager extends Manager {
         sContext = context;
         context.registerReceiver(ALARM_BROADCAST_RECEIVER, new IntentFilter(PING_ALARM_ACTION));
         sAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
-        sPendingIntent = PendingIntent.getBroadcast(context, 0, new Intent(PING_ALARM_ACTION), 0);
+        int pendingIntentFlags = 0;
+        if (Build.VERSION.SDK_INT >= 23) {
+            pendingIntentFlags |= PendingIntent.FLAG_IMMUTABLE;
+        }
+        sPendingIntent = PendingIntent.getBroadcast(context, 0, new Intent(PING_ALARM_ACTION), pendingIntentFlags);
         sAlarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                 SystemClock.elapsedRealtime() + AlarmManager.INTERVAL_HALF_HOUR,
                 AlarmManager.INTERVAL_HALF_HOUR, sPendingIntent);

smack-android/build.gradle

@@ -1,3 +1,9 @@
+plugins {
+	id 'org.igniterealtime.smack.java-common-conventions'
+	id 'org.igniterealtime.smack.android-conventions'
+	id 'org.igniterealtime.smack.android-boot-classpath-conventions'
+}
+
 description = """\
 Smack for Android.
 All the required dependencies to run Smack on Android.
@@ -16,13 +22,13 @@ dependencies {
 	// used in non-Android projects.
 	implementation "org.minidns:minidns-android21:$miniDnsVersion"
 
-	// androidProjects lists all projects that are checked to compile against android.jar
-	// Filter out the optional Smack dependencies from androidProjects
-	(androidProjects - androidOptionalProjects)
-	.each { project ->
-		api project
-	}
+	api project(':smack-core')
+	api project(':smack-im')
+	api project(':smack-resolver-minidns')
+	api project(':smack-sasl-provided')
+	api project(':smack-xmlparser')
+	api project(':smack-xmlparser-xpp3')
 
 	// Add the Android jar to the Eclipse .classpath.
-	compileClasspath files(androidBootClasspath)
+	implementation files(androidBootClasspath)
 }

smack-android/src/main/java/org/jivesoftware/smack/android/AndroidSmackInitializer.java

@@ -37,6 +37,8 @@ import org.minidns.dnsserverlookup.android21.AndroidUsingLinkProperties;
 public class AndroidSmackInitializer implements SmackInitializer {
 
     @Override
+    // Android deprecated StrictHostnameVerifier in API level 22
+    @SuppressWarnings("deprecation")
     public List<Exception> initialize() {
         SmackConfiguration.setDefaultHostnameVerifier(new StrictHostnameVerifier());
         Base64.setEncoder(AndroidBase64Encoder.INSTANCE);

smack-android/src/main/java/org/jivesoftware/smackx/debugger/android/AndroidDebugger.java

@@ -28,7 +28,7 @@ import android.util.Log;
  * implementation, therefore {@link org.jivesoftware.smack.debugger.JulDebugger} is preferred.
  * </p>
  * It is possible to not only print the raw sent and received stanzas but also the interpreted
- * packets by Smack. By default interpreted packets won't be printed. To enable this feature
+ * packets by Smack. By default,interpreted packets won't be printed. To enable this feature
  * just change the <code>printInterpreted</code> static variable to <code>true</code>.
  *
  */

smack-android/src/main/java/org/jivesoftware/smackx/package-info.java

@@ -1 +1 @@
-../../../../../../../smack-java8-full/src/main/java/org/jivesoftware/smackx/package-info.java
+../../../../../../../smack-java11-full/src/main/java/org/jivesoftware/smackx/package-info.java

smack-bosh/build.gradle

@@ -1,3 +1,8 @@
+plugins {
+	id 'org.igniterealtime.smack.java-common-conventions'
+	id 'org.igniterealtime.smack.android-conventions'
+}
+
 description = """\
 Smack BOSH API.
 This API is considered beta quality."""

smack-bosh/src/main/java/org/jivesoftware/smack/bosh/XMPPBOSHConnection.java

@@ -172,14 +172,15 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
 
             client = BOSHClient.create(cfgBuilder.build());
 
-            client.addBOSHClientConnListener(new BOSHConnectionListener());
-            client.addBOSHClientResponseListener(new BOSHPacketReader());
-
-            // Initialize the debugger
+            // Initialize the debugger before addBOSHClientResponseListener(new BOSHPacketReader());
+            // BOSHPacketReader may hold and send response prior to display of the request i.e. <response/> before <challenge/>
             if (debugger != null) {
                 initDebugger();
             }
 
+            client.addBOSHClientConnListener(new BOSHConnectionListener());
+            client.addBOSHClientResponseListener(new BOSHPacketReader());
+
             // Send the session creation request
             client.send(ComposableBody.builder()
                     .setNamespaceDefinition("xmpp", XMPP_BOSH_NS)
@@ -359,10 +360,11 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
         CloseableUtil.maybeClose(reader, LOGGER);
         CloseableUtil.maybeClose(writer, LOGGER);
 
+        // set readerConsumer = null before reader to avoid NPE reference
+        readerConsumer = null;
         readerPipe = null;
         reader = null;
         writer = null;
-        readerConsumer = null;
     }
 
     /**
@@ -440,6 +442,8 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
                 if (event.getBody() != null) {
                     try {
                         writer.write(event.getBody().toXML());
+                        // Fix all BOSH sent debug messages not shown
+                        writer.flush();
                     } catch (Exception e) {
                         // Ignore
                     }

smack-core/build.gradle

@@ -1,7 +1,7 @@
-// Note that this is also declared in the main build.gradle for
-// subprojects, but since evaluationDependsOnChildren is enabled we
-// need to declare it here too to have bundle{bnd{...}} available
-apply plugin: 'biz.aQute.bnd.builder'
+plugins {
+	id 'org.igniterealtime.smack.java-common-conventions'
+	id 'org.igniterealtime.smack.android-conventions'
+}
 
 description = """\
 Smack core components."""
@@ -16,6 +16,9 @@ dependencies {
 	api "org.jxmpp:jxmpp-jid:$jxmppVersion"
 	api "org.minidns:minidns-core:$miniDnsVersion"
 
+	// TODO: Migrate Junit4 tests to Junit5.
+	testImplementation "org.junit.vintage:junit-vintage-engine:$junitVersion"
+
 	testFixturesImplementation project(':smack-xmlparser-stax')
 	testFixturesImplementation project(':smack-xmlparser-xpp3')
 
@@ -28,7 +31,7 @@ dependencies {
 
 	testFixturesApi "org.jxmpp:jxmpp-jid:$jxmppVersion:tests"
 	testFixturesApi "org.xmlunit:xmlunit-core:$xmlUnitVersion"
-	// Explictily add assertj-core which is a dependency of
+	// Explicitly add assertj-core which is a dependency of
 	// xmlunit-assertj, but gradle fails to resolves it with:
 	// Execution failed for task ':smack-core:compileTestJava'.
 	// > Could not resolve all files for configuration ':smack-core:testCompileClasspath'.
@@ -59,7 +62,7 @@ task createVersionResource(type: CreateFileTask) {
 	outputFile = new File(projectDir, 'src/main/resources/org.jivesoftware.smack/version')
 }
 
-compileJava.dependsOn(createVersionResource)
+processResources.dependsOn(createVersionResource)
 
 jar {
 	bundle {

smack-core/src/integration-test/java/org/jivesoftware/smack/MessageTest.java

@@ -60,7 +60,7 @@ public class MessageTest extends SmackTestCase {
         }
 
         Message message = (Message) collector.nextResult(2500);
-        assertNotNull("Message not recieved from remote user", message);
+        assertNotNull("Message not received from remote user", message);
     }
 
     /**

smack-core/src/integration-test/java/org/jivesoftware/smack/test/SmackTestCase.java

@@ -487,7 +487,7 @@ public abstract class SmackTestCase extends TestCase {
     }
 
     /**
-     * Returns the name of the configuration file related to <b>this</b> test case. By default all
+     * Returns the name of the configuration file related to <b>this</b> test case. By default,all
      * the test cases will use the same configuration file. However, it's possible to override the
      * default configuration by providing a file of the form <test case class name>.xml
      * (e.g. RosterTest.xml).

smack-core/src/main/java/org/jivesoftware/smack/AbstractConnectionListener.java

@@ -1,51 +0,0 @@
-/**
- *
- * Copyright 2009 the original author or authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.jivesoftware.smack;
-
-/**
- * The AbstractConnectionListener class provides an empty implementation for all
- * methods defined by the {@link ConnectionListener} interface. This is a
- * convenience class which should be used in case you do not need to implement
- * all methods.
- *
- * @author Henning Staib
- * @deprecated use {@link ConnectionListener} instead.
- */
-// TODO: Remove in Smack 4.5.
-@Deprecated
-public class AbstractConnectionListener implements ConnectionListener {
-    @Override
-    public void connected(XMPPConnection connection) {
-        // do nothing
-    }
-
-    @Override
-    public void authenticated(XMPPConnection connection, boolean resumed) {
-        // do nothing
-    }
-
-    @Override
-    public void connectionClosed() {
-        // do nothing
-    }
-
-    @Override
-    public void connectionClosedOnError(Exception e) {
-        // do nothing
-    }
-
-}

smack-core/src/main/java/org/jivesoftware/smack/AbstractXMPPConnection.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2009 Jive Software, 2018-2022 Florian Schmaus.
+ * Copyright 2009 Jive Software, 2018-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.jivesoftware.smack;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.Writer;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -128,7 +129,7 @@ import org.jxmpp.stringprep.XmppStringprepException;
 import org.jxmpp.util.XmppStringUtils;
 
 /**
- * This abstract class is commonly used as super class for XMPP connection mechanisms like TCP and BOSH. Hence it
+ * This abstract class is commonly used as super class for XMPP connection mechanisms like TCP and BOSH. Hence, it
  * provides the methods for connection state management, like {@link #connect()}, {@link #login()} and
  * {@link #disconnect()} (which are deliberately not provided by the {@link XMPPConnection} interface).
  * <p>
@@ -387,6 +388,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
      *
      * @param configuration The configuration which is used to establish the connection.
      */
+    @SuppressWarnings("this-escape")
     protected AbstractXMPPConnection(ConnectionConfiguration configuration) {
         saslAuthentication = new SASLAuthentication(this, configuration);
         config = configuration;
@@ -1067,6 +1069,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
     }
 
     @Override
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <I extends IQ> I sendIqRequestAndWaitForResponse(IQ request)
             throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         StanzaCollector collector = createStanzaCollectorAndSend(request);
@@ -1214,7 +1217,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
         }
         Stanza packet = (Stanza) sendTopLevelStreamElement;
 
-        final List<StanzaListener> listenersToNotify = new LinkedList<>();
+        final List<StanzaListener> listenersToNotify = new ArrayList<>();
         synchronized (sendListeners) {
             for (ListenerWrapper listenerWrapper : sendListeners.values()) {
                 if (listenerWrapper.filterMatches(packet)) {
@@ -1242,27 +1245,6 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
         });
     }
 
-    @Deprecated
-    @Override
-    public void addStanzaInterceptor(StanzaListener packetInterceptor,
-            StanzaFilter packetFilter) {
-        if (packetInterceptor == null) {
-            throw new NullPointerException("Packet interceptor is null.");
-        }
-        InterceptorWrapper interceptorWrapper = new InterceptorWrapper(packetInterceptor, packetFilter);
-        synchronized (interceptors) {
-            interceptors.put(packetInterceptor, interceptorWrapper);
-        }
-    }
-
-    @Deprecated
-    @Override
-    public void removeStanzaInterceptor(StanzaListener packetInterceptor) {
-        synchronized (interceptors) {
-            interceptors.remove(packetInterceptor);
-        }
-    }
-
     private static <MPB extends MessageOrPresenceBuilder<MP, MPB>, MP extends MessageOrPresence<MPB>> void addInterceptor(
                     Map<Consumer<MPB>, GenericInterceptorWrapper<MPB, MP>> interceptors, Consumer<MPB> interceptor,
                     Predicate<MP> filter) {
@@ -1305,7 +1287,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
 
     private static <MPB extends MessageOrPresenceBuilder<MP, MPB>, MP extends MessageOrPresence<MPB>> MP fireMessageOrPresenceInterceptors(
                     MP messageOrPresence, Map<Consumer<MPB>, GenericInterceptorWrapper<MPB, MP>> interceptors) {
-        List<Consumer<MPB>> interceptorsToInvoke = new LinkedList<>();
+        List<Consumer<MPB>> interceptorsToInvoke = new ArrayList<>();
         synchronized (interceptors) {
             for (GenericInterceptorWrapper<MPB, MP> interceptorWrapper : interceptors.values()) {
                 if (interceptorWrapper.filterMatches(messageOrPresence)) {
@@ -1340,7 +1322,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
      * @return the, potentially modified stanza, after the interceptors are run.
      */
     private Stanza firePacketInterceptors(Stanza packet) {
-        List<StanzaListener> interceptorsToInvoke = new LinkedList<>();
+        List<StanzaListener> interceptorsToInvoke = new ArrayList<>();
         synchronized (interceptors) {
             for (InterceptorWrapper interceptorWrapper : interceptors.values()) {
                 if (interceptorWrapper.filterMatches(packet)) {
@@ -1625,7 +1607,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
         // First handle the async recv listeners. Note that this code is very similar to what follows a few lines below,
         // the only difference is that asyncRecvListeners is used here and that the packet listeners are started in
         // their own thread.
-        final Collection<StanzaListener> listenersToNotify = new LinkedList<>();
+        final Collection<StanzaListener> listenersToNotify = new ArrayList<>();
         extractMatchingListeners(packet, asyncRecvListeners, listenersToNotify);
         for (final StanzaListener listener : listenersToNotify) {
             asyncGoLimited(new Runnable() {
@@ -1951,7 +1933,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
         // Default implementation does nothing
     }
 
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     @Override
     public <F extends XmlElement> F getFeature(QName qname) {
         return (F) streamFeatures.get(qname);
@@ -2196,6 +2178,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
      * {@link #maxAsyncRunnables}. Note that we use a {@code LinkedList} in order to avoid space blowups in case the
      * list ever becomes very big and shrinks again.
      */
+    @SuppressWarnings("JdkObsolete")
     private final Queue<Runnable> deferredAsyncRunnables = new LinkedList<>();
 
     private int deferredAsyncRunnablesCount;

smack-core/src/main/java/org/jivesoftware/smack/AsyncButOrdered.java

@@ -53,14 +53,14 @@ import java.util.concurrent.Executor;
 public class AsyncButOrdered<K> {
 
     /**
-     * A map with the currently pending runnables for a given key. Note that this is a weak hash map so we do not have
-     * to take care of removing the keys ourselfs from the map.
+     * A map with the currently pending runnables for a given key. Note that this is a weak hash map, so we do not have
+     * to take care of removing the keys ourselves from the map.
      */
     private final Map<K, Queue<Runnable>> pendingRunnables = new WeakHashMap<>();
 
     /**
      * A marker map if there is an active thread for the given key. Holds the responsible handler thread if one is
-     * active, otherwise the key is non-existend in the map.
+     * active, otherwise the key is non-existent in the map.
      */
     private final Map<K, Handler> threadActiveMap = new HashMap<>();
 

smack-core/src/main/java/org/jivesoftware/smack/ConnectionConfiguration.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2017-2022 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2017-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -88,7 +88,7 @@ import org.minidns.util.InetAddressUtil;
 /**
  * The connection configuration used for XMPP client-to-server connections. A well configured XMPP service will
  * typically only require you to provide two parameters: The XMPP address, also known as the JID, of the user and the
- * password. All other configuration parameters could ideally be determined automatically by Smack. Hence it is often
+ * password. All other configuration parameters could ideally be determined automatically by Smack. Hence, it is often
  * enough to call {@link Builder#setXmppAddressAndPassword(CharSequence, String)}.
  * <p>
  * Technically there are typically at least two parameters required: Some kind of credentials for authentication. And
@@ -248,7 +248,7 @@ public abstract class ConnectionConfiguration {
 
         stanzaIdSourceFactory = builder.stanzaIdSourceFactory;
 
-        // If the enabledSaslmechanisms are set, then they must not be empty
+        // If the enabledSaslMechanisms are set, then they must not be empty
         assert enabledSaslMechanisms == null || !enabledSaslMechanisms.isEmpty();
     }
 
@@ -267,7 +267,7 @@ public abstract class ConnectionConfiguration {
             context = SSLContext.getInstance("TLS");
         }
 
-        // TODO: Remove the block below once we removed setKeystorePath(), setKeystoreType(), setCallbackHanlder() and
+        // TODO: Remove the block below once we removed setKeystorePath(), setKeystoreType(), setCallbackHandler() and
         // setPKCS11Library() in the builder, and all related fields and the parameters of this function.
         if (keyManagers == null) {
             keyManagers = Builder.getKeyManagersFrom(keystoreType, keystorePath, callbackHandler, pkcs11Library);
@@ -534,7 +534,7 @@ public abstract class ConnectionConfiguration {
     /**
      * Returns the stream language to use when connecting to the server.
      *
-     * @return the stream language to use when connecting to the server.
+     * @return the stream language to use when connecting to the server or <code>null</code>.
      */
     public Locale getLanguage() {
         return language;
@@ -544,19 +544,21 @@ public abstract class ConnectionConfiguration {
      * Returns the xml:lang string of the stream language to use when connecting to the server.
      *
      * <p>If the developer sets the language to null, this will also return null, leading to
-     * the removal of the xml:lang tag from the stream. If a Locale("") is configured, this will
-     * return "", which can be used as an override.</p>
+     * the removal of the xml:lang tag from the stream.</p>
      *
-     * @return the stream language to use when connecting to the server.
+     * @return the stream language to use when connecting to the server or <code>null</code>.
      */
     public String getXmlLang() {
-        // TODO: Change to Locale.toLanguageTag() once Smack's minimum Android API level is 21 or higher.
-        // This will need a workaround for new Locale("").getLanguageTag() returning "und". Expected
-        // behavior of this function:
-        //  - returns null if language is null
-        //  - returns "" if language.getLanguage() returns the empty string
-        //  - returns language.toLanguageTag() otherwise
-        return language != null ? language.toString().replace("_", "-") : null;
+        if (language == null) {
+            return null;
+        }
+
+        String languageTag = language.toLanguageTag();
+        if (languageTag.equals("und")) {
+            return null;
+        }
+
+        return languageTag;
     }
 
     /**
@@ -583,7 +585,7 @@ public abstract class ConnectionConfiguration {
      * Returns true if the connection is going to use stream compression. Stream compression
      * will be requested after TLS was established (if TLS was enabled) and only if the server
      * offered stream compression. With stream compression network traffic can be reduced
-     * up to 90%. By default compression is disabled.
+     * up to 90%. By default,compression is disabled.
      *
      * @return true if the connection is going to use stream compression.
      */
@@ -592,7 +594,7 @@ public abstract class ConnectionConfiguration {
     }
 
     /**
-     * Check if the given SASL mechansism is enabled in this connection configuration.
+     * Check if the given SASL mechanism is enabled in this connection configuration.
      *
      * @param saslMechanism TODO javadoc me please
      * @return true if the given SASL mechanism is enabled, false otherwise.
@@ -607,7 +609,7 @@ public abstract class ConnectionConfiguration {
 
     /**
      * Return the explicitly enabled SASL mechanisms. May return <code>null</code> if no SASL mechanisms where
-     * explicitly enabled, i.e. all SALS mechanisms supported and announced by the service will be considered.
+     * explicitly enabled, i.e. all SASL mechanisms supported and announced by the service will be considered.
      *
      * @return the enabled SASL mechanisms or <code>null</code>.
      */
@@ -670,6 +672,7 @@ public abstract class ConnectionConfiguration {
         private boolean compressionEnabled = false;
         private StanzaIdSourceFactory stanzaIdSourceFactory = new StandardStanzaIdSource.Factory();
 
+        @SuppressWarnings("this-escape")
         protected Builder() {
             if (SmackConfiguration.DEBUG) {
                 enableDefaultDebugger();
@@ -857,22 +860,6 @@ public abstract class ConnectionConfiguration {
             return getThis();
         }
 
-        /**
-         * Set the host to connect to by either its fully qualified domain name (FQDN) or its IP.
-         *
-         * @param fqdnOrIp a CharSequence either representing the FQDN or the IP of the host.
-         * @return a reference to this builder.
-         * @see #setHost(DnsName)
-         * @see #setHostAddress(InetAddress)
-         * @since 4.3.2
-         * @deprecated use {@link #setHost(CharSequence)} instead.
-         */
-        @Deprecated
-        // TODO: Remove in Smack 4.5.
-        public B setHostAddressByNameOrIp(CharSequence fqdnOrIp) {
-            return setHost(fqdnOrIp);
-        }
-
         public B setPort(int port) {
             if (port < 0 || port > 65535) {
                 throw new IllegalArgumentException(
@@ -1021,25 +1008,6 @@ public abstract class ConnectionConfiguration {
             return getThis();
         }
 
-        /**
-         * Sets a custom SSLContext for creating SSL sockets.
-         * <p>
-         * For more information on how to create a SSLContext see <a href=
-         * "http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html#X509TrustManager"
-         * >Java Secure Socket Extension (JSEE) Reference Guide: Creating Your Own X509TrustManager</a>
-         *
-         * @param context the custom SSLContext for new sockets.
-         * @return a reference to this builder.
-         * @deprecated use {@link #setSslContextFactory(SslContextFactory)} instead}.
-         */
-        // TODO: Remove in Smack 4.5.
-        @Deprecated
-        public B setCustomSSLContext(SSLContext context) {
-            return setSslContextFactory(() -> {
-                return context;
-            });
-        }
-
         /**
          * Sets a custom SSLContext for creating SSL sockets.
          * <p>
@@ -1090,8 +1058,7 @@ public abstract class ConnectionConfiguration {
         }
 
         /**
-         * Sets if an initial available presence will be sent to the server. By default
-         * an available presence will be sent to the server indicating that this presence
+         * Sets if an initial available presence will be sent to the server. By default,         * an available presence will be sent to the server indicating that this presence
          * is not online and available to receive messages. If you want to log in without
          * being 'noticed' then pass a <code>false</code> value.
          *
@@ -1187,7 +1154,9 @@ public abstract class ConnectionConfiguration {
             if (!SASLAuthentication.isSaslMechanismRegistered(SASLMechanism.EXTERNAL)) {
                 throw new IllegalArgumentException("SASL " + SASLMechanism.EXTERNAL + " is not registered");
             }
-            setCustomSSLContext(sslContext);
+            setSslContextFactory(() -> {
+                return sslContext;
+            });
             throwIfEnabledSaslMechanismsSet();
 
             allowEmptyOrNullUsernames();
@@ -1266,7 +1235,7 @@ public abstract class ConnectionConfiguration {
          * Sets if the connection is going to use compression (default false).
          *
          * Compression is only activated if the server offers compression. With compression network
-         * traffic can be reduced up to 90%. By default compression is disabled.
+         * traffic can be reduced up to 90%. By default,compression is disabled.
          *
          * @param compressionEnabled if the connection is going to use compression on the HTTP level.
          * @return a reference to this object.
@@ -1324,7 +1293,7 @@ public abstract class ConnectionConfiguration {
                 } else {
                     InputStream stream = TLSUtils.getDefaultTruststoreStreamIfPossible();
                     try {
-                        // Note that PKCS12 keystores need a password one some Java platforms. Hence we try the famous
+                        // Note that PKCS12 keystores need a password one some Java platforms. Hence, we try the famous
                         // 'changeit' here. See https://bugs.openjdk.java.net/browse/JDK-8194702
                         char[] password = "changeit".toCharArray();
                         try {

smack-core/src/main/java/org/jivesoftware/smack/SASLAuthentication.java

@@ -53,7 +53,7 @@ import org.jxmpp.jid.EntityBareJid;
  *
  * <p>Once TLS has been negotiated (i.e. the connection has been secured) it is possible to
  * register with the server or authenticate using SASL. If the
- * server supports SASL then Smack will try to authenticate using SASL..</p>
+ * server supports SASL then Smack will try to authenticate using SASL.</p>
  *
  * <p>The server may support many SASL mechanisms to use for authenticating. Out of the box
  * Smack provides several SASL mechanisms, but it is possible to register new SASL Mechanisms. Use

smack-core/src/main/java/org/jivesoftware/smack/ScheduledAction.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018 Florian Schmaus
+ * Copyright 2018-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,11 +50,13 @@ public class ScheduledAction implements Delayed {
         return smackReactor.cancel(this);
     }
 
+    @SuppressWarnings("JavaUtilDate")
     public boolean isDue() {
         Date now = new Date();
         return now.after(releaseTime);
     }
 
+    @SuppressWarnings("JavaUtilDate")
     public long getTimeToDueMillis() {
         long now = System.currentTimeMillis();
         return releaseTime.getTime() - now;

smack-core/src/main/java/org/jivesoftware/smack/Smack.java

@@ -30,7 +30,7 @@ public class Smack {
     public static final String SMACK_PACKAGE = SMACK_ORG + ".smack";
 
     /**
-     * Returns the Smack version information, eg "1.3.0".
+     * Returns the Smack version information, e.g."1.3.0".
      *
      * @return the Smack version information.
      */

smack-core/src/main/java/org/jivesoftware/smack/SmackConfiguration.java

@@ -102,7 +102,7 @@ public final class SmackConfiguration {
     private static HostnameVerifier defaultHostnameVerififer;
 
     /**
-     * Returns the Smack version information, eg "1.3.0".
+     * Returns the Smack version information, e.g."1.3.0".
      *
      * @return the Smack version information.
      * @deprecated use {@link Smack#getVersion()} instead.

smack-core/src/main/java/org/jivesoftware/smack/SmackInitialization.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2014-2020 Florian Schmaus
+ * Copyright 2003-2007 Jive Software, 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -63,7 +63,7 @@ public final class SmackInitialization {
 
     private static final Logger LOGGER = Logger.getLogger(SmackInitialization.class.getName());
 
-    /**
+    /*
      * Loads the configuration from the smack-config.xml and system properties file.
      * <p>
      * So far this means that:

smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018-2020 Florian Schmaus
+ * Copyright 2018-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -144,6 +144,7 @@ public class SmackReactor {
         }
     }
 
+    @SuppressWarnings("JavaUtilDate")
     ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit, ScheduledAction.Kind scheduledActionKind) {
         long releaseTimeEpoch = System.currentTimeMillis() + unit.toMillis(delay);
         Date releaseTimeDate = new Date(releaseTimeEpoch);
@@ -276,8 +277,7 @@ public class SmackReactor {
                     setInterestOpsCancelledKeySafe(selectionKey, 0);
                 }
 
-                selectedKeys = new ArrayList<>(selectedKeySet.size());
-                selectedKeys.addAll(selectedKeySet);
+                selectedKeys = new ArrayList<>(selectedKeySet);
                 selectedKeySet.clear();
             }
 
@@ -327,6 +327,12 @@ public class SmackReactor {
 
             int currentReactorThreadCount = reactorThreads.size();
             int myKeyCount = pendingSelectionKeysSize / currentReactorThreadCount;
+            // The division could result in myKeyCount being zero, even though there are pending selection keys.
+            // Therefore, ensure that this thread tries to get at least one pending selection key by invoking poll().
+            // Otherwise, it could happen that we end up in a busy loop, where myKeyCount is zero and this thread invokes
+            // selector.wakeup() below because pendingSelectionsKeys is not empty, but the woken up reactor thread wil
+            // end up with myKeyCount being zero again, restarting the busy-loop cycle.
+            if (myKeyCount == 0) myKeyCount = 1;
             Collection<SelectionKey> selectedKeys = new ArrayList<>(myKeyCount);
             for (int i = 0; i < myKeyCount; i++) {
                 SelectionKey selectionKey = pendingSelectionKeys.poll();

smack-core/src/main/java/org/jivesoftware/smack/StanzaCollector.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2016-2019 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2016-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -117,7 +117,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @return the next stanza result, or <code>null</code> if there are no more
      *      results.
      */
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     public synchronized <P extends Stanza> P pollResult() {
         return (P) resultQueue.poll();
     }
@@ -134,6 +134,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @return the next available packet.
      * @throws XMPPErrorException in case an error response.
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <P extends Stanza> P pollResultOrThrow() throws XMPPErrorException {
         P result = pollResult();
         if (result != null) {
@@ -150,7 +151,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @return the next available packet.
      * @throws InterruptedException if the calling thread was interrupted.
      */
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     // TODO: Consider removing this method as it is hardly ever useful.
     public synchronized <P extends Stanza> P nextResultBlockForever() throws InterruptedException {
         throwIfCancelled();
@@ -175,6 +176,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @return the next available packet.
      * @throws InterruptedException if the calling thread was interrupted.
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <P extends Stanza> P nextResult() throws InterruptedException {
         return nextResult(connection.getReplyTimeout());
     }
@@ -191,7 +193,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @return the next available stanza or <code>null</code> on timeout or connection error.
      * @throws InterruptedException if the calling thread was interrupted.
      */
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     public <P extends Stanza> P nextResult(long timeout) throws InterruptedException {
         throwIfCancelled();
         P res = null;
@@ -223,6 +225,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @throws NotConnectedException if the XMPP connection is not connected.
      * @see #nextResultOrThrow(long)
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <P extends Stanza> P nextResultOrThrow() throws NoResponseException, XMPPErrorException,
                     InterruptedException, NotConnectedException {
         return nextResultOrThrow(connection.getReplyTimeout());
@@ -263,6 +266,7 @@ public final class StanzaCollector implements AutoCloseable {
      * @throws InterruptedException if the calling thread was interrupted.
      * @throws NotConnectedException if there was no response and the connection got disconnected.
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <P extends Stanza> P nextResultOrThrow(long timeout) throws NoResponseException,
                     XMPPErrorException, InterruptedException, NotConnectedException {
         P result;

smack-core/src/main/java/org/jivesoftware/smack/StanzaListener.java

@@ -27,12 +27,6 @@ import org.jivesoftware.smack.packet.Stanza;
  * the {@link #processStanza(Stanza)} method will be called. This is the
  * opposite approach to the functionality provided by a {@link StanzaCollector}
  * which lets you block while waiting for results.
- * <p>
- * Additionally you are able to intercept Packets that are going to be send and
- * make modifications to them. You can register a PacketListener as interceptor
- * by using {@link XMPPConnection#addStanzaInterceptor(StanzaListener,
- * org.jivesoftware.smack.filter.StanzaFilter)}
- * </p>
  *
  * @see XMPPConnection#addAsyncStanzaListener(StanzaListener, org.jivesoftware.smack.filter.StanzaFilter)
  * @author Matt Tucker

smack-core/src/main/java/org/jivesoftware/smack/XMPPConnection.java

@@ -91,23 +91,24 @@ import org.jxmpp.jid.EntityFullJid;
  * <h2>Incoming Stanza Listeners</h2>
  * Most callbacks (listeners, handlers, …) than you can add to a connection come in three different variants:
  * <ul>
- * <li>standard</li>
- * <li>async (asynchronous)</li>
- * <li>sync (synchronous)</li>
+ * <li>asynchronous - e.g., {@link #addAsyncStanzaListener(StanzaListener, StanzaFilter)}</li>
+ * <li>synchronous  - e.g., {@link #addSyncStanzaListener(StanzaListener, StanzaFilter)}</li>
+ * <li>other        - e.g., {@link #addStanzaListener(StanzaListener, StanzaFilter)}</li>
  * </ul>
  * <p>
- * Standard callbacks are invoked concurrently, but it is ensured that the same callback is never run concurrently.
- * The callback's identity is used as key for that. The events delivered to the callback preserve the order of the
- * causing events of the connection.
- * </p>
- * <p>
- * Asynchronous callbacks are run decoupled from the connections main event loop. Hence a callback triggered by
+ * Asynchronous callbacks are run decoupled from the connections main event loop. Hence, a callback triggered by
  * stanza B may (appear to) invoked before a callback triggered by stanza A, even though stanza A arrived before B.
  * </p>
  * <p>
- * Synchronous callbacks are run synchronous to the main event loop of a connection. Hence they are invoked in the
- * exact order of how events happen there, most importantly the arrival order of incoming stanzas. You should only
- * use synchronous callbacks in rare situations.
+ * Synchronous callbacks are invoked concurrently, but it is ensured that the same callback is never run concurrently
+ * and that they are executed in order. That is, if both stanza A and B trigger the same callback, and A arrives before
+ * B, then the callback will be invoked with A first, and then B. Furthermore, those callbacks are not executed within
+ * the main loop. However it is still advisable that those callbacks do not block or only block briefly.
+ * </p>
+ * <p>
+ * Other callbacks are run synchronous to the main event loop of a connection and are executed within the main loop.
+ * <b>This means that if such a callback blocks, the main event loop also blocks, which can easily cause deadlocks.
+ * Therefore, you should avoid using those callbacks unless you know what you are doing.</b>
  * </p>
  * <h2>Stanza Filters</h2>
  * Stanza filters allow you to define the predicates for which listeners or collectors should be invoked. For more
@@ -241,7 +242,7 @@ public interface XMPPConnection {
      * </p>
      *
      * @param stanza the stanza to send.
-     * @return {@code true} if the stanza was successfully scheduled to be send, {@code false} otherwise.
+     * @return {@code true} if the stanza was successfully scheduled to be sent, {@code false} otherwise.
      * @throws NotConnectedException if the connection is not connected.
      * @since 4.4.0
      * @deprecated use {@link #sendStanzaNonBlocking(Stanza)} instead.
@@ -264,7 +265,7 @@ public interface XMPPConnection {
      * @param stanza the stanza to send.
      * @param timeout how long to wait before giving up, in units of {@code unit}.
      * @param unit a {@code TimeUnit} determining how to interpret the {@code timeout} parameter.
-     * @return {@code true} if the stanza was successfully scheduled to be send, {@code false} otherwise.
+     * @return {@code true} if the stanza was successfully scheduled to be sent, {@code false} otherwise.
      * @throws NotConnectedException if the connection is not connected.
      * @throws InterruptedException if the calling thread was interrupted.
      * @since 4.4.0
@@ -317,6 +318,7 @@ public interface XMPPConnection {
      * @throws InterruptedException if the calling thread was interrupted.
      * @since 4.3
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     <I extends IQ> I sendIqRequestAndWaitForResponse(IQ request)
             throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException;
 
@@ -409,7 +411,7 @@ public interface XMPPConnection {
     boolean removeStanzaListener(StanzaListener stanzaListener);
 
     /**
-     *  Registers a <b>synchronous</b> stanza listener with this connection. A stanza listener will be invoked only when
+     * Registers a <b>synchronous</b> stanza listener with this connection. A stanza listener will be invoked only when
      * an incoming stanza is received. A stanza filter determines which stanzas will be delivered to the listener. If
      * the same stanza listener is added again with a different filter, only the new filter will be used.
      * <p>
@@ -422,7 +424,6 @@ public interface XMPPConnection {
      *
      * @param stanzaListener the stanza listener to notify of new received stanzas.
      * @param stanzaFilter the stanza filter to use.
-     * @see #addStanzaInterceptor(StanzaListener, StanzaFilter)
      * @since 4.1
      */
     void addSyncStanzaListener(StanzaListener stanzaListener, StanzaFilter stanzaFilter);
@@ -448,7 +449,6 @@ public interface XMPPConnection {
      *
      * @param stanzaListener the stanza listener to notify of new received stanzas.
      * @param stanzaFilter the stanza filter to use.
-     * @see #addStanzaInterceptor(StanzaListener, StanzaFilter)
      * @since 4.1
     */
     void addAsyncStanzaListener(StanzaListener stanzaListener, StanzaFilter stanzaFilter);
@@ -482,34 +482,6 @@ public interface XMPPConnection {
      */
     void removeStanzaSendingListener(StanzaListener stanzaListener);
 
-    /**
-     * Registers a stanza interceptor with this connection. The interceptor will be
-     * invoked every time a stanza is about to be sent by this connection. Interceptors
-     * may modify the stanza to be sent. A stanza filter determines which stanzas
-     * will be delivered to the interceptor.
-     *
-     * <p>
-     * NOTE: For a similar functionality on incoming stanzas, see {@link #addAsyncStanzaListener(StanzaListener, StanzaFilter)}.
-     * </p>
-     *
-     * @param stanzaInterceptor the stanza interceptor to notify of stanzas about to be sent.
-     * @param stanzaFilter      the stanza filter to use.
-     * @deprecated use {@link #addMessageInterceptor(Consumer, Predicate)} or {@link #addPresenceInterceptor(Consumer, Predicate)} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    void addStanzaInterceptor(StanzaListener stanzaInterceptor, StanzaFilter stanzaFilter);
-
-    /**
-     * Removes a stanza interceptor.
-     *
-     * @param stanzaInterceptor the stanza interceptor to remove.
-     * @deprecated use {@link #removeMessageInterceptor(Consumer)} or {@link #removePresenceInterceptor(Consumer)} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    void removeStanzaInterceptor(StanzaListener stanzaInterceptor);
-
     /**
      * Registers a stanza interceptor with this connection. The interceptor will be
      * invoked every time a stanza is about to be sent by this connection. Interceptors
@@ -610,23 +582,6 @@ public interface XMPPConnection {
      */
     FromMode getFromMode();
 
-    /**
-     * Get the feature stanza extensions for a given stream feature of the
-     * server, or <code>null</code> if the server doesn't support that feature.
-     *
-     * @param <F> {@link ExtensionElement} type of the feature.
-     * @param element TODO javadoc me please
-     * @param namespace TODO javadoc me please
-     * @return a stanza extensions of the feature or <code>null</code>
-     * @deprecated use {@link #getFeature(Class)} instead.
-     */
-    // TODO: Remove in Smack 4.5.
-    @Deprecated
-    default <F extends XmlElement> F getFeature(String element, String namespace) {
-        QName qname = new QName(namespace, element);
-        return getFeature(qname);
-    }
-
     /**
      * Get the feature stanza extensions for a given stream feature of the
      * server, or <code>null</code> if the server doesn't support that feature.
@@ -636,6 +591,7 @@ public interface XMPPConnection {
      * @return a stanza extensions of the feature or <code>null</code>
      * @since 4.4
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     <F extends XmlElement> F getFeature(QName qname);
 
     /**

smack-core/src/main/java/org/jivesoftware/smack/XmppInputOutputFilter.java

@@ -57,8 +57,8 @@ public interface XmppInputOutputFilter {
     }
 
     /**
-     * The returned {@link ByteBuffer} is going to get fliped by the caller. The callee must not flip the buffer.
-     * @param inputData the data this methods needs to process.
+     * The returned {@link ByteBuffer} is going to get flipped by the caller. The callee must not flip the buffer.
+     * @param inputData the data this method needs to process.
      * @return a {@link ByteBuffer} or {@code null} if no data could be produced.
      * @throws IOException in case an I/O exception occurs.
      */

smack-core/src/main/java/org/jivesoftware/smack/c2s/ModularXmppClientToServerConnection.java

@@ -301,7 +301,7 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
         currentStateVertex = StateDescriptorGraph.convertToStateGraph(initialStateDescriptorVertex, connectionInternal);
     }
 
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     public <CM extends ModularXmppClientToServerConnectionModule<? extends ModularXmppClientToServerConnectionModuleDescriptor>> CM getConnectionModuleFor(
                     Class<? extends ModularXmppClientToServerConnectionModuleDescriptor> descriptorClass) {
         return (CM) connectionModules.get(descriptorClass);
@@ -390,7 +390,7 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
 
             // Ignore successorStateVertex if the only way to the final state is via the initial state. This happens
             // typically if we are in the ConnectedButUnauthenticated state on the way to ResourceboundAndAuthenticated,
-            // where we do not want to walk via InstantShutdown/Shtudown in a cycle over the initial state towards this
+            // where we do not want to walk via InstantShutdown/Shutdown in a cycle over the initial state towards this
             // state.
             if (walkStateGraphContext.wouldCauseCycle(successorStateVertex)) {
                 // Ignore this successor.
@@ -658,6 +658,7 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
         updateOutgoingStreamXmlEnvironmentOnStreamOpen(streamOpen);
     }
 
+    @SuppressWarnings("this-escape")
     public static class DisconnectedStateDescriptor extends StateDescriptor {
         protected DisconnectedStateDescriptor() {
             super(DisconnectedState.class, StateDescriptor.Property.finalState);
@@ -666,7 +667,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class DisconnectedState extends State {
-
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private DisconnectedState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -707,6 +709,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     private final class LookupRemoteConnectionEndpointsState extends State {
         boolean outgoingElementsQueueWasShutdown;
 
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private LookupRemoteConnectionEndpointsState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -817,6 +821,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class ConnectedButUnauthenticatedState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private ConnectedButUnauthenticatedState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -849,6 +855,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class SaslAuthenticationState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private SaslAuthenticationState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -892,6 +900,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     public static final class ResourceBindingStateDescriptor extends StateDescriptor {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private ResourceBindingStateDescriptor() {
             super(ResourceBindingState.class, "RFC 6120 § 7");
             addSuccessor(AuthenticatedAndResourceBoundStateDescriptor.class);
@@ -899,6 +909,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class ResourceBindingState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private ResourceBindingState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -954,6 +966,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class AuthenticatedAndResourceBoundState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private AuthenticatedAndResourceBoundState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -994,6 +1008,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class ShutdownState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private ShutdownState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);
@@ -1056,6 +1072,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private static final class InstantShutdownState extends NoOpState {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private InstantShutdownState(ModularXmppClientToServerConnection connection, StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(connection, stateDescriptor, connectionInternal);
@@ -1077,6 +1095,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
     }
 
     private final class CloseConnectionState extends State {
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private CloseConnectionState(StateDescriptor stateDescriptor,
                         ModularXmppClientToServerConnectionInternal connectionInternal) {
             super(stateDescriptor, connectionInternal);

smack-core/src/main/java/org/jivesoftware/smack/compression/CompressionModuleDescriptor.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018-2020 Florian Schmaus
+ * Copyright 2018-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,6 +41,8 @@ public class CompressionModuleDescriptor extends ModularXmppClientToServerConnec
 
     public static final class Builder extends ModularXmppClientToServerConnectionModuleDescriptor.Builder {
 
+        // Invoked via reflection.
+        @SuppressWarnings("UnusedMethod")
         private Builder(ModularXmppClientToServerConnectionConfiguration.Builder connectionConfigurationBuilder) {
             super(connectionConfigurationBuilder);
         }

smack-core/src/main/java/org/jivesoftware/smack/compression/zlib/ZlibXmppCompressionFactory.java

@@ -143,7 +143,9 @@ public final class ZlibXmppCompressionFactory extends XmppCompressionFactory {
                 int bytesWritten = compressor.deflate(buffer, initialOutputBufferPosition, length, flushMode);
 
                 int newOutputBufferPosition = initialOutputBufferPosition + bytesWritten;
-                outputBuffer.position(newOutputBufferPosition);
+                // Workaround for Android API not matching Java >=9 API.
+                // See https://issuetracker.google.com/issues/369219141
+               ((java.nio.Buffer) outputBuffer).position(newOutputBufferPosition);
 
                 totalBytesWritten += bytesWritten;
 
@@ -156,7 +158,9 @@ public final class ZlibXmppCompressionFactory extends XmppCompressionFactory {
                     increasedBufferSize = MINIMUM_OUTPUT_BUFFER_INCREASE;
                 }
                 ByteBuffer newCurrentOutputBuffer = ByteBuffer.allocate(increasedBufferSize);
-                outputBuffer.flip();
+                // Workaround for Android API not matching Java >=9 API.
+                // See https://issuetracker.google.com/issues/369219141
+                ((java.nio.Buffer) outputBuffer).flip();
                 newCurrentOutputBuffer.put(outputBuffer);
                 outputBuffer = newCurrentOutputBuffer;
             }
@@ -202,7 +206,9 @@ public final class ZlibXmppCompressionFactory extends XmppCompressionFactory {
                     throw new IOException(e);
                 }
 
-                outputBuffer.position(inflateOutputBufferOffset + bytesInflated);
+                // Workaround for Android API not matching Java >=9 API.
+                // See https://issuetracker.google.com/issues/369219141
+                ((java.nio.Buffer) outputBuffer).position(inflateOutputBufferOffset + bytesInflated);
 
                 decompressorOutBytes += bytesInflated;
 
@@ -212,7 +218,9 @@ public final class ZlibXmppCompressionFactory extends XmppCompressionFactory {
 
                 int increasedBufferSize = outputBuffer.capacity() * 2;
                 ByteBuffer increasedOutputBuffer = ByteBuffer.allocate(increasedBufferSize);
-                outputBuffer.flip();
+                // Workaround for Android API not matching Java >=9 API.
+                // See https://issuetracker.google.com/issues/369219141
+                ((java.nio.Buffer) outputBuffer).flip();
                 increasedOutputBuffer.put(outputBuffer);
                 outputBuffer = increasedOutputBuffer;
             }

smack-core/src/main/java/org/jivesoftware/smack/datatypes/UInt16.java

@@ -19,7 +19,7 @@ package org.jivesoftware.smack.datatypes;
 import org.jivesoftware.smack.util.NumberUtil;
 
 /**
- * A number representing an unsigned 16-bit integer. Can be used for values with the XML schema type "xs:unsingedShort".
+ * A number representing an unsigned 16-bit integer. Can be used for values with the XML schema type "xs:unsignedShort".
  */
 public final class UInt16 extends Scalar implements Comparable<UInt16> {
 

smack-core/src/main/java/org/jivesoftware/smack/debugger/ConsoleDebugger.java

@@ -28,19 +28,20 @@ import org.jivesoftware.smack.util.ExceptionUtil;
  * even block the thread since only one thread may print at a time.
  * <p>
  * It is possible to not only print the raw sent and received stanzas but also the interpreted
- * packets by Smack. By default interpreted packets won't be printed. To enable this feature
+ * packets by Smack. By default,interpreted packets won't be printed. To enable this feature
  * just change the <code>printInterpreted</code> static variable to <code>true</code>.
  * </p>
  *
  * @author Gaston Dombiak
  */
 public class ConsoleDebugger extends AbstractDebugger {
-    private final SimpleDateFormat dateFormatter = new SimpleDateFormat("HH:mm:ss");
+    private final SimpleDateFormat dateFormatter = new SimpleDateFormat("HH:mm:ss.S");
 
     public ConsoleDebugger(XMPPConnection connection) {
         super(connection);
     }
 
+    @SuppressWarnings("JavaUtilDate")
     @Override
     protected void log(String logMessage) {
         String formatedDate;

smack-core/src/main/java/org/jivesoftware/smack/debugger/JulDebugger.java

@@ -27,7 +27,7 @@ import org.jivesoftware.smack.XMPPConnection;
  * even block the thread since only one thread may print at a time.
  * <p>
  * It is possible to not only print the raw sent and received stanzas but also the interpreted
- * packets by Smack. By default interpreted packets won't be printed. To enable this feature
+ * packets by Smack. By default,interpreted packets won't be printed. To enable this feature
  * just change the <code>printInterpreted</code> static variable to <code>true</code>.
  * </p>
  *

smack-core/src/main/java/org/jivesoftware/smack/debugger/SmackDebugger.java

@@ -57,7 +57,7 @@ public abstract class SmackDebugger {
      *
      * @param user the user@host/resource that has just logged in
      */
-    // TODO: Should be replaced with a connection listener authenticed().
+    // TODO: Should be replaced with a connection listener authenticated().
     public abstract void userHasLogged(EntityFullJid user);
 
     /**

smack-core/src/main/java/org/jivesoftware/smack/filter/NotFilter.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software.
+ * Copyright 2003-2007 Jive Software, 2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 
 package org.jivesoftware.smack.filter;
 
+import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.util.Objects;
 
@@ -43,4 +44,9 @@ public class NotFilter implements StanzaFilter {
     public boolean accept(Stanza packet) {
         return !filter.accept(packet);
     }
+
+    public static <E extends ExtensionElement> NotFilter of(Class<E> extensionElementClass) {
+        ExtensionElementFilter<E> extensionElementFilter = new ExtensionElementFilter<>(extensionElementClass);
+        return new NotFilter(extensionElementFilter);
+    }
 }

smack-core/src/main/java/org/jivesoftware/smack/filter/StanzaIdFilter.java

@@ -18,6 +18,7 @@
 package org.jivesoftware.smack.filter;
 
 import org.jivesoftware.smack.packet.Stanza;
+import org.jivesoftware.smack.packet.StanzaView;
 import org.jivesoftware.smack.util.StringUtils;
 
 /**
@@ -34,7 +35,7 @@ public class StanzaIdFilter implements StanzaFilter {
      *
      * @param stanza the stanza which the ID is taken from.
      */
-    public StanzaIdFilter(Stanza stanza) {
+    public StanzaIdFilter(StanzaView stanza) {
         this(stanza.getStanzaId());
     }
 

smack-core/src/main/java/org/jivesoftware/smack/filter/package-info.java

@@ -23,7 +23,7 @@
  *   <li>{@link StanzaIdFilter}: filters for stanzas with a particular stanza ID</li>
  *   <li>{@link ToMatchesFilter}: filters for stanzas that are sent to a particular address</li>
  *   <li>{@link FromMatchesFilter}: filters for stanzas that are sent from a particular address</li>
- *   <li>{@link ExtensionElementFilter}: filters for stanzas that have a particular stanza exentsion element</li>
+ *   <li>{@link ExtensionElementFilter}: filters for stanzas that have a particular stanza extension element</li>
  *   <li>{@link AndFilter}: implements the logical AND operation over two or more filters</li>
  *   <li>{@link OrFilter}: implements the logical OR operation over two or more filters</li>
  *   <li>{@link NotFilter}: implements the logical NOT operation on a filter</li>

smack-core/src/main/java/org/jivesoftware/smack/fsm/StateDescriptor.java

@@ -118,7 +118,7 @@ public abstract class StateDescriptor {
         if (stateClassConstructor != null) {
             stateClassConstructor.setAccessible(true);
         } else {
-            // TODO: Add validation check that if stateClassConstructor is 'null' the cosntructState() method is overriden.
+            // TODO: Add validation check that if stateClassConstructor is 'null' the constructState() method is overridden.
         }
 
         String className = getClass().getSimpleName();
@@ -155,7 +155,7 @@ public abstract class StateDescriptor {
             clazz = Class.forName(clazzName);
         } catch (ClassNotFoundException e) {
             // The state descriptor class is not in classpath, which probably means that the smack module is not loaded
-            // into the classpath. Hence we can silently ignore that.
+            // into the classpath. Hence, we can silently ignore that.
             LOGGER.log(Level.FINEST, "Ignoring unknown state descriptor '" + clazzName + "'", e);
             return;
         }

smack-core/src/main/java/org/jivesoftware/smack/fsm/StateDescriptorGraph.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018-2021 Florian Schmaus
+ * Copyright 2018-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -215,7 +215,7 @@ public class StateDescriptorGraph {
                 inferredForwardEdges.put(predecessor, backwardsEdge);
             }
         }
-        // Ensure that the intial node has their successors inferred.
+        // Ensure that the initial node has their successors inferred.
         for (Class<? extends StateDescriptor> inferredSuccessorOfInitialStateDescriptor : inferredForwardEdges.getAll(initialStatedescriptorClass)) {
             initialNode.getElement().addSuccessor(inferredSuccessorOfInitialStateDescriptor);
         }
@@ -368,7 +368,7 @@ public class StateDescriptorGraph {
         }
     }
 
-    public static <E> void stateDescriptorGraphToDot(Collection<GraphVertex<StateDescriptor>> vertexes,
+    public static void stateDescriptorGraphToDot(Collection<GraphVertex<StateDescriptor>> vertexes,
                     PrintWriter dotOut, boolean breakStateName) {
         dotOut.append("digraph {\n");
         dfs(vertexes,

smack-core/src/main/java/org/jivesoftware/smack/initializer/UrlInitializer.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014-2018 Florian Schmaus
+ * Copyright 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@ package org.jivesoftware.smack.initializer;
 
 import java.io.InputStream;
 import java.net.URI;
-import java.util.LinkedList;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -42,7 +42,7 @@ public abstract class UrlInitializer implements SmackInitializer {
     public List<Exception> initialize() {
         InputStream is = null;
         final ClassLoader classLoader = this.getClass().getClassLoader();
-        final List<Exception> exceptions = new LinkedList<Exception>();
+        final List<Exception> exceptions = new ArrayList<Exception>();
         final String providerUriString = getProvidersUri();
         if (providerUriString != null) {
             try {

smack-core/src/main/java/org/jivesoftware/smack/isr/InstantStreamResumptionModuleDescriptor.java

@@ -41,6 +41,8 @@ public class InstantStreamResumptionModuleDescriptor extends ModularXmppClientTo
 
     public static final class Builder extends ModularXmppClientToServerConnectionModuleDescriptor.Builder {
 
+        // Unfinished implementation.
+        @SuppressWarnings("UnusedMethod")
         private Builder(ModularXmppClientToServerConnectionConfiguration.Builder connectionConfigurationBuilder) {
             super(connectionConfigurationBuilder);
         }

smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractError.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014-2021 Florian Schmaus
+ * Copyright 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -108,6 +108,7 @@ public class AbstractError {
      * @param <PE> type of the ExtensionElement.
      * @return the extension, or <code>null</code> if it doesn't exist.
      */
+    @SuppressWarnings("TypeParameterUnusedInFormals")
     public <PE extends XmlElement> PE getExtension(String elementName, String namespace) {
         return PacketUtil.extensionElementFrom(extensions, elementName, namespace);
     }

smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractTextElement.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2017-2019 Florian Schmaus
+ * Copyright © 2017-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,15 +54,4 @@ public abstract class AbstractTextElement implements ExtensionElement {
         return lang;
     }
 
-    /**
-     * Deprecated.
-     *
-     * @return deprecated
-     * @deprecated use {@link #getLanguage()} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public final String getLang() {
-        return lang;
-    }
 }

smack-core/src/main/java/org/jivesoftware/smack/packet/EmptyResultIQ.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2023 Florian Schmaus
+ * Copyright © 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ public class EmptyResultIQ extends IQ {
     }
 
     // TODO: Deprecate when stanza builder and parsing logic is ready.
+    @SuppressWarnings("this-escape")
     public EmptyResultIQ() {
         super((String) null, null);
         setType(IQ.Type.result);

smack-core/src/main/java/org/jivesoftware/smack/packet/ExtensionElement.java

@@ -19,7 +19,7 @@ package org.jivesoftware.smack.packet;
 /**
  * Interface to represent XMPP extension elements. Unlike {@link XmlElement}, every non-abstract class that implements
  * {@link ExtensionElement} must have a static final QNAME member of the type {@link javax.xml.namespace.QName}. This
- * allows type-safe functions like {@link StanzaView#getExtension(Class)}. Hence this is a marker interface.
+ * allows type-safe functions like {@link StanzaView#getExtension(Class)}. Hence, this is a marker interface.
  * <p>
  * Use this class when implementing new extension elements when possible. This means that every instance of your
  * implemented class must represent an XML element of the same qualified name.

smack-core/src/main/java/org/jivesoftware/smack/packet/IQ.java

@@ -88,14 +88,14 @@ public abstract class IQ extends Stanza implements IqView {
     }
 
     @Override
-    public Type getType() {
+    public final Type getType() {
         return type;
     }
 
     /**
      * Sets the type of the IQ packet.
      * <p>
-     * Since the type of an IQ must present, an IllegalArgmentException will be thrown when type is
+     * Since the type of an IQ must present, an IllegalArgumentException will be thrown when type is
      * <code>null</code>.
      * </p>
      *
@@ -182,7 +182,7 @@ public abstract class IQ extends Stanza implements IqView {
         // Add the query section if there is one.
         IQChildElementXmlStringBuilder iqChildElement = getIQChildElementBuilder(
                         new IQChildElementXmlStringBuilder(getChildElementName(), getChildElementNamespace(), null, xml.getXmlEnvironment()));
-        // TOOD: Document the cases where iqChildElement is null but childElementName not. And if there are none, change
+        // TODO: Document the cases where iqChildElement is null but childElementName not. And if there are none, change
         // the logic.
         if (iqChildElement == null) {
             return;
@@ -287,20 +287,6 @@ public abstract class IQ extends Stanza implements IqView {
         return ErrorIQ.createErrorResponse(request, error);
     }
 
-    /**
-     * Deprecated.
-     *
-     * @param request the request.
-     * @param error the error.
-     * @return an error IQ.
-     * @deprecated use {@link #createErrorResponse(IQ, StanzaError)} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public static ErrorIQ createErrorResponse(final IQ request, final StanzaError.Builder error) {
-        return createErrorResponse(request, error.build());
-    }
-
     public static ErrorIQ createErrorResponse(final IQ request, final StanzaError.Condition condition) {
         return createErrorResponse(request, StanzaError.getBuilder(condition).build());
     }

smack-core/src/main/java/org/jivesoftware/smack/packet/Mechanisms.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2020 Florian Schmaus
+ * Copyright © 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,9 @@
  */
 package org.jivesoftware.smack.packet;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.LinkedList;
 import java.util.List;
 
 import javax.xml.namespace.QName;
@@ -31,7 +31,7 @@ public class Mechanisms implements ExtensionElement {
     public static final String NAMESPACE = "urn:ietf:params:xml:ns:xmpp-sasl";
     public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
 
-    public final List<String> mechanisms = new LinkedList<String>();
+    public final List<String> mechanisms = new ArrayList<String>();
 
     public Mechanisms(String mechanism) {
         mechanisms.add(mechanism);

smack-core/src/main/java/org/jivesoftware/smack/packet/Message.java

@@ -17,7 +17,6 @@
 
 package org.jivesoftware.smack.packet;
 
-import java.util.List;
 import java.util.Locale;
 
 import javax.xml.namespace.QName;
@@ -29,10 +28,6 @@ import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
-import org.jxmpp.jid.Jid;
-import org.jxmpp.jid.impl.JidCreate;
-import org.jxmpp.stringprep.XmppStringprepException;
-
 /**
  * Represents XMPP message packets. A message can be one of several types:
  *
@@ -63,85 +58,7 @@ public final class Message extends MessageOrPresence<MessageBuilder>
     public static final String ELEMENT = "message";
     public static final String BODY = "body";
 
-    private Type type;
-
-    /**
-     * Creates a new, "normal" message.
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message() {
-    }
-
-    /**
-     * Creates a new "normal" message to the specified recipient.
-     *
-     * @param to the recipient of the message.
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message(Jid to) {
-        setTo(to);
-    }
-
-    /**
-     * Creates a new message of the specified type to a recipient.
-     *
-     * @param to the user to send the message to.
-     * @param type the message type.
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message(Jid to, Type type) {
-        this(to);
-        setType(type);
-    }
-
-    /**
-     * Creates a new message to the specified recipient and with the specified body.
-     *
-     * @param to the user to send the message to.
-     * @param body the body of the message.
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message(Jid to, String body) {
-        this(to);
-        setBody(body);
-    }
-
-    /**
-     * Creates a new message to the specified recipient and with the specified body.
-     *
-     * @param to the user to send the message to.
-     * @param body the body of the message.
-     * @throws XmppStringprepException if 'to' is not a valid XMPP address.
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message(String to, String body) throws XmppStringprepException {
-        this(JidCreate.from(to), body);
-    }
-
-    /**
-     * Creates a new message with the specified recipient and extension element.
-     *
-     * @param to TODO javadoc me please
-     * @param extensionElement TODO javadoc me please
-     * @since 4.2
-     * @deprecated use {@link StanzaBuilder}, preferable via {@link StanzaFactory}, instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Message(Jid to, ExtensionElement extensionElement) {
-        this(to);
-        addExtension(extensionElement);
-    }
+    private final Type type;
 
     Message(MessageBuilder messageBuilder) {
         super(messageBuilder);
@@ -170,197 +87,6 @@ public final class Message extends MessageOrPresence<MessageBuilder>
         return type;
     }
 
-    /**
-     * Sets the type of the message.
-     *
-     * @param type the type of the message.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setType(Type type) {
-        this.type = type;
-    }
-
-    /**
-     * Sets the subject of the message. The subject is a short description of
-     * message contents.
-     *
-     * @param subject the subject of the message.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public void setSubject(String subject) {
-        if (subject == null) {
-            removeSubject(""); // use empty string because #removeSubject(null) is ambiguous
-            return;
-        }
-        addSubject(null, subject);
-    }
-
-    /**
-     * Adds a subject with a corresponding language.
-     *
-     * @param language the language of the subject being added.
-     * @param subject the subject being added to the message.
-     * @return the new {@link org.jivesoftware.smack.packet.Message.Subject}
-     * @throws NullPointerException if the subject is null, a null pointer exception is thrown
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public Subject addSubject(String language, String subject) {
-        language = Stanza.determineLanguage(this, language);
-
-        List<Subject> currentSubjects = getExtensions(Subject.class);
-        for (Subject currentSubject : currentSubjects) {
-            if (language.equals(currentSubject.getLanguage())) {
-                throw new IllegalArgumentException("Subject with the language " + language + " already exists");
-            }
-        }
-
-        Subject messageSubject = new Subject(language, subject);
-        addExtension(messageSubject);
-        return messageSubject;
-    }
-
-    /**
-     * Removes the subject with the given language from the message.
-     *
-     * @param language the language of the subject which is to be removed
-     * @return true if a subject was removed and false if it was not.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public boolean removeSubject(String language) {
-        language = Stanza.determineLanguage(this, language);
-        for (Subject subject : getExtensions(Subject.class)) {
-            if (language.equals(subject.language)) {
-                return removeSubject(subject);
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Removes the subject from the message and returns true if the subject was removed.
-     *
-     * @param subject the subject being removed from the message.
-     * @return true if the subject was successfully removed and false if it was not.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public boolean removeSubject(Subject subject) {
-        return removeExtension(subject) != null;
-    }
-
-    /**
-     * Sets the body of the message.
-     *
-     * @param body the body of the message.
-     * @see #setBody(String)
-     * @since 4.2
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public void setBody(CharSequence body) {
-        String bodyString;
-        if (body != null) {
-            bodyString = body.toString();
-        } else {
-            bodyString = null;
-        }
-        setBody(bodyString);
-    }
-
-    /**
-     * Sets the body of the message. The body is the main message contents.
-     *
-     * @param body the body of the message.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public void setBody(String body) {
-        if (body == null) {
-            removeBody(""); // use empty string because #removeBody(null) is ambiguous
-            return;
-        }
-        addBody(null, body);
-    }
-
-    /**
-     * Adds a body with a corresponding language.
-     *
-     * @param language the language of the body being added.
-     * @param body the body being added to the message.
-     * @return the new {@link org.jivesoftware.smack.packet.Message.Body}
-     * @throws NullPointerException if the body is null, a null pointer exception is thrown
-     * @since 3.0.2
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public Body addBody(String language, String body) {
-        language = Stanza.determineLanguage(this, language);
-
-        removeBody(language);
-
-        Body messageBody = new Body(language, body);
-        addExtension(messageBody);
-        return messageBody;
-    }
-
-    /**
-     * Removes the body with the given language from the message.
-     *
-     * @param language the language of the body which is to be removed
-     * @return true if a body was removed and false if it was not.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public boolean removeBody(String language) {
-        language = Stanza.determineLanguage(this, language);
-        for (Body body : getBodies()) {
-            String bodyLanguage = body.getLanguage();
-            if (Objects.equals(bodyLanguage, language)) {
-                removeExtension(body);
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Removes the body from the message and returns true if the body was removed.
-     *
-     * @param body the body being removed from the message.
-     * @return true if the body was successfully removed and false if it was not.
-     * @since 3.0.2
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public boolean removeBody(Body body) {
-        XmlElement removedElement = removeExtension(body);
-        return removedElement != null;
-    }
-
-    /**
-     * Sets the thread id of the message, which is a unique identifier for a sequence
-     * of "chat" messages.
-     *
-     * @param thread the thread id of the message.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove when stanza builder is ready.
-    public void setThread(String thread) {
-        addExtension(new Message.Thread(thread));
-    }
-
     @Override
     public String getElementName() {
         return ELEMENT;
@@ -412,22 +138,6 @@ public final class Message extends MessageOrPresence<MessageBuilder>
         return buf;
     }
 
-    /**
-     * Creates and returns a copy of this message stanza.
-     * <p>
-     * This does not perform a deep clone, as extension elements are shared between the new and old
-     * instance.
-     * </p>
-     * @return a clone of this message.
-     * @deprecated use {@link #asBuilder()} instead.
-     */
-    // TODO: Remove in Smack 4.5.
-    @Deprecated
-    @Override
-    public Message clone() {
-        return new Message(this);
-    }
-
     /**
      * Represents a message subject, its language and the content of the subject.
      */

smack-core/src/main/java/org/jivesoftware/smack/packet/MessageOrPresence.java

@@ -20,11 +20,6 @@ import org.jivesoftware.smack.XMPPConnection;
 
 public abstract class MessageOrPresence<MPB extends MessageOrPresenceBuilder<?, ?>> extends Stanza {
 
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    protected MessageOrPresence() {
-    }
-
     protected MessageOrPresence(StanzaBuilder<?> stanzaBuilder) {
         super(stanzaBuilder);
     }

smack-core/src/main/java/org/jivesoftware/smack/packet/Nonza.java

@@ -18,7 +18,7 @@
 package org.jivesoftware.smack.packet;
 
 /**
- * A Nonza, i.e everything that is <b>not a stanza</b> as defined
+ * A Nonza, i.e. everything that is <b>not a stanza</b> as defined
  * RFC 6120 8. Stanzas are {@link Message}, {@link Presence} and {@link IQ}.
  * Everything else should sublcass this class instead of {@link Stanza}.
  * <p>

smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2020-2021 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2020-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,12 +21,9 @@ import java.util.List;
 import java.util.Locale;
 
 import org.jivesoftware.smack.XMPPConnection;
-import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
-import org.jxmpp.jid.Jid;
-
 /**
  * Represents XMPP presence stanzas. Every presence stanza has a type, which is one of
  * the following values:
@@ -78,55 +75,6 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
 
     private Mode mode = null;
 
-    /**
-     * Creates a new presence update. Status, priority, and mode are left un-set.
-     *
-     * @param type the type.
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Presence(Type type) {
-        // Ensure that the stanza ID is set by calling super().
-        super();
-        setType(type);
-    }
-
-    /**
-     * Creates a new presence with the given type and using the given XMPP address as recipient.
-     *
-     * @param to the recipient.
-     * @param type the type.
-     * @since 4.2
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Presence(Jid to, Type type) {
-        this(type);
-        setTo(to);
-    }
-
-    /**
-     * Creates a new presence update with a specified status, priority, and mode.
-     *
-     * @param type the type.
-     * @param status a text message describing the presence update.
-     * @param priority the priority of this presence update.
-     * @param mode the mode type for this presence update.
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public Presence(Type type, String status, int priority, Mode mode) {
-        // Ensure that the stanza ID is set by calling super().
-        super();
-        setType(type);
-        setStatus(status);
-        setPriority(priority);
-        setMode(mode);
-    }
-
     Presence(PresenceBuilder presenceBuilder) {
         super(presenceBuilder);
         type = presenceBuilder.type;
@@ -186,36 +134,11 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
         return type;
     }
 
-    /**
-     * Sets the type of the presence packet.
-     *
-     * @param type the type of the presence packet.
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setType(Type type) {
-        this.type = Objects.requireNonNull(type, "Type cannot be null");
-    }
-
     @Override
     public String getStatus() {
         return status;
     }
 
-    /**
-     * Sets the status message of the presence update. The status is free-form text
-     * describing a user's presence (i.e., "gone to lunch").
-     *
-     * @param status the status message.
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setStatus(String status) {
-        this.status = status;
-    }
-
     @Override
     public int getPriority() {
         return getPriorityByte();
@@ -233,20 +156,11 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * Sets the priority of the presence. The valid range is -128 through 127.
      *
      * @param priority the priority of the presence.
-     * @throws IllegalArgumentException if the priority is outside the valid range.
      * @see <a href="https://tools.ietf.org/html/rfc6121#section-4.7.2.3">RFC 6121 § 4.7.2.3. Priority Element</a>
      * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setPriority(int priority) {
-        if (priority < -128 || priority > 127) {
-            throw new IllegalArgumentException("Priority value " + priority +
-                    " is not valid. Valid range is -128 through 127.");
-        }
-        setPriority((byte) priority);
-    }
-
+    // TODO: Remove in Smack 4.6.
     public void setPriority(byte priority) {
         this.priority = priority;
     }
@@ -259,19 +173,6 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
         return mode;
     }
 
-    /**
-     * Sets the mode of the presence update. A null presence mode value is interpreted
-     * to be the same thing as {@link Presence.Mode#available}.
-     *
-     * @param mode the mode.
-     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setMode(Mode mode) {
-        this.mode = mode;
-    }
-
     @Override
     public String getElementName() {
         return ELEMENT;
@@ -346,37 +247,6 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
         return buf;
     }
 
-    /**
-     * Creates and returns a copy of this presence stanza.
-     * <p>
-     * This does not perform a deep clone, as extension elements are shared between the new and old
-     * instance.
-     * </p>
-     * @return a clone of this presence.
-     * @deprecated use {@link #asBuilder()} instead.
-     */
-    // TODO: Remove in Smack 4.5.
-    @Deprecated
-    @Override
-    public Presence clone() {
-        return new Presence(this);
-    }
-
-    /**
-     * Clone this presence and set a newly generated stanza ID as the clone's ID.
-     *
-     * @return a "clone" of this presence  with a different stanza ID.
-     * @since 4.1.2
-     * @deprecated use {@link #asBuilder(XMPPConnection)} or {@link #asBuilder(String)}instead.
-     */
-    // TODO: Remove in Smack 4.5.
-    @Deprecated
-    public Presence cloneWithNewId() {
-        Presence clone = clone();
-        clone.setNewStanzaId();
-        return clone;
-    }
-
     /**
      * An enum to represent the presence type. Note that presence type is often confused
      * with presence mode. Generally, if a user is signed in to a server, they have a presence

smack-core/src/main/java/org/jivesoftware/smack/packet/Session.java

@@ -39,6 +39,7 @@ public class Session extends SimpleIQ {
     public static final String ELEMENT = "session";
     public static final String NAMESPACE = "urn:ietf:params:xml:ns:xmpp-session";
 
+    @SuppressWarnings("this-escape")
     public Session() {
         super(ELEMENT, NAMESPACE);
         setType(IQ.Type.set);

smack-core/src/main/java/org/jivesoftware/smack/packet/StandardExtensionElement.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2015-2021 Florian Schmaus.
+ * Copyright 2015-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,9 +53,7 @@ public final class StandardExtensionElement implements XmlElement {
 
     /**
      * Constructs a new extension element with the given name and namespace and nothing else.
-     * <p>
      * This is meant to construct extension elements used as simple flags in Stanzas.
-     * <p>
      *
      * @param name the name of the extension element.
      * @param namespace the namespace of the extension element.

smack-core/src/main/java/org/jivesoftware/smack/packet/Stanza.java

@@ -98,7 +98,7 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
     protected Stanza(StanzaBuilder<?> stanzaBuilder) {
         if (stanzaBuilder.stanzaIdSource != null) {
             id = stanzaBuilder.stanzaIdSource.getNewStanzaId();
-            // Note that some stanza ID sources, e.g. StanzaBuilder.PresenceBuilder.EMPTY return null here. Hence we
+            // Note that some stanza ID sources, e.g. StanzaBuilder.PresenceBuilder.EMPTY return null here. Hence, we
             // only check that the returned string is not empty.
             assert StringUtils.isNullOrNotEmpty(id);
             usedStanzaIdSource = stanzaBuilder.stanzaIdSource;
@@ -159,22 +159,6 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
         return id != null;
     }
 
-    /**
-     * Set the stanza id if none is set.
-     *
-     * @return the stanza id.
-     * @since 4.2
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public String setStanzaId() {
-        if (!hasStanzaIdSet()) {
-            setNewStanzaId();
-        }
-        return getStanzaId();
-    }
-
     /**
      * Throws an {@link IllegalArgumentException} if this stanza has no stanza ID set.
      *
@@ -219,7 +203,7 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
      * @param to who the packet is being sent to.
      */
     // TODO: Mark this as deprecated once StanzaBuilder is ready and all call sites are gone.
-    public void setTo(Jid to) {
+    public final void setTo(Jid to) {
         this.to = to;
     }
 
@@ -255,34 +239,11 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
         error = stanzaError;
     }
 
-    /**
-     * Deprecated.
-     * @param stanzaError the stanza error.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setError(StanzaError.Builder stanzaError) {
-        setError(stanzaError.build());
-    }
-
     @Override
     public final String getLanguage() {
         return language;
     }
 
-    /**
-     * Sets the xml:lang of this Stanza.
-     *
-     * @param language the xml:lang of this Stanza.
-     * @deprecated use {@link StanzaBuilder#setLanguage(String)} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public void setLanguage(String language) {
-        this.language = language;
-    }
-
     @Override
     public final List<XmlElement> getExtensions() {
         synchronized (extensionElements) {
@@ -374,22 +335,6 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
         return packetExtension;
     }
 
-    /**
-     * This method is deprecated. Use preferably {@link #getExtension(Class)} or {@link #getExtensionElement(String, String)}.
-     *
-     * @param <E> the type to cast to.
-     * @param elementName the XML element name of the extension. (May be null)
-     * @param namespace the XML element namespace of the extension.
-     * @return the extension, or <code>null</code> if it doesn't exist.
-     * @deprecated use {@link #getExtension(Class)} or {@link #getExtensionElement(String, String)} instead.
-     */
-    // TODO: Remove in Smack 4.5.
-    @SuppressWarnings("unchecked")
-    @Deprecated
-    public final <E extends ExtensionElement> E getExtension(String elementName, String namespace) {
-        return (E) getExtensionElement(elementName, namespace);
-    }
-
     @Override
     public final XmlElement getExtension(QName qname) {
         synchronized (extensionElements) {
@@ -501,27 +446,6 @@ public abstract class Stanza implements StanzaView, TopLevelStreamElement {
         }
     }
 
-    /**
-     * Removes a stanza extension from the packet.
-     *
-     * @param extension the stanza extension to remove.
-     * @return the removed stanza extension or null.
-     * @deprecated use {@link StanzaBuilder} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public final XmlElement removeExtension(XmlElement extension)  {
-        QName key = extension.getQName();
-        synchronized (extensionElements) {
-            List<XmlElement> list = extensionElements.getAll(key);
-            boolean removed = list.remove(extension);
-            if (removed) {
-                return extension;
-            }
-        }
-        return null;
-    }
-
     /**
      * Returns a short String describing the Stanza. This method is suited for log purposes.
      */

smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaBuilder.java

@@ -87,9 +87,9 @@ public abstract class StanzaBuilder<B extends StanzaBuilder<B>> implements Stanz
     }
 
     /**
-     * Set the recipent address of the stanza.
+     * Set the recipient address of the stanza.
      *
-     * @param to whoe the stanza is being sent to.
+     * @param to whom the stanza is being sent.
      * @return a reference to this builder.
      * @throws XmppStringprepException if the provided character sequence is not a valid XMPP address.
      * @see #to(Jid)

smack-core/src/main/java/org/jivesoftware/smack/packet/StanzaView.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2019-2021 Florian Schmaus
+ * Copyright 2019-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,7 +36,7 @@ public interface StanzaView extends XmlLangElement {
     /**
      * Returns who the stanza is being sent "to", or <code>null</code> if
      * the value is not set. The XMPP protocol often makes the "to"
-     * attribute optional, so it does not always need to be set.<p>
+     * attribute optional, so it does not always need to be set.
      *
      * @return who the stanza is being sent to, or <code>null</code> if the
      *      value has not been set.
@@ -46,7 +46,7 @@ public interface StanzaView extends XmlLangElement {
     /**
      * Returns who the stanza is being sent "from" or <code>null</code> if
      * the value is not set. The XMPP protocol often makes the "from"
-     * attribute optional, so it does not always need to be set.<p>
+     * attribute optional, so it does not always need to be set.
      *
      * @return who the stanza is being sent from, or <code>null</code> if the
      *      value has not been set.

smack-core/src/main/java/org/jivesoftware/smack/packet/StreamError.java

@@ -58,9 +58,9 @@ import org.jivesoftware.smack.util.XmlStringBuilder;
  *          stream has been authenticated </td></tr>
  *      <tr><td> policy-violation </td><td> the entity has violated some local service
  *          policy. </td></tr>
- *      <tr><td> remote-connection-failed </td><td> Rthe server is unable to properly connect
+ *      <tr><td> remote-connection-failed </td><td> the server is unable to properly connect
  *          to a remote entity. </td></tr>
- *      <tr><td> resource-constraint </td><td> Rthe server lacks the system resources necessary
+ *      <tr><td> resource-constraint </td><td> the server lacks the system resources necessary
  *          to service the stream. </td></tr>
  *      <tr><td> restricted-xml </td><td> the entity has attempted to send restricted XML
  *          features. </td></tr>

smack-core/src/main/java/org/jivesoftware/smack/packet/UnparsedIQ.java

@@ -16,6 +16,8 @@
  */
 package org.jivesoftware.smack.packet;
 
+import org.jivesoftware.smack.util.StringUtils;
+
 /**
  * An IQ stanzas that could not be parsed because no provider was found.
  */
@@ -34,7 +36,12 @@ public class UnparsedIQ extends IQ {
 
     @Override
     protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
-        xml.escape(content);
+        if (StringUtils.isEmpty(content)) {
+            xml.setEmptyElement();
+        } else {
+            xml.rightAngleBracket();
+            xml.escape(content);
+        }
         return xml;
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/provider/ProviderFileLoader.java

@@ -17,9 +17,9 @@
 package org.jivesoftware.smack.provider;
 
 import java.io.InputStream;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -39,11 +39,11 @@ import org.jivesoftware.smack.xml.XmlPullParser;
 public class ProviderFileLoader implements ProviderLoader {
     private static final Logger LOGGER = Logger.getLogger(ProviderFileLoader.class.getName());
 
-    private final Collection<IQProviderInfo> iqProviders = new LinkedList<IQProviderInfo>();
-    private final Collection<ExtensionProviderInfo> extProviders  = new LinkedList<ExtensionProviderInfo>();
-    private final Collection<StreamFeatureProviderInfo> sfProviders = new LinkedList<StreamFeatureProviderInfo>();
+    private final Collection<IQProviderInfo> iqProviders = new ArrayList<IQProviderInfo>();
+    private final Collection<ExtensionProviderInfo> extProviders  = new ArrayList<ExtensionProviderInfo>();
+    private final Collection<StreamFeatureProviderInfo> sfProviders = new ArrayList<StreamFeatureProviderInfo>();
 
-    private List<Exception> exceptions = new LinkedList<Exception>();
+    private List<Exception> exceptions = new ArrayList<Exception>();
 
     public ProviderFileLoader(InputStream providerStream) {
         this(providerStream, ProviderFileLoader.class.getClassLoader());

smack-core/src/main/java/org/jivesoftware/smack/provider/ProviderManager.java

@@ -97,6 +97,7 @@ import org.jivesoftware.smack.util.XmppElementUtil;
  *     </extensionProvider>
  * &lt;/smackProviders&gt;</pre>
  *
+ * <p>
  * If multiple provider entries attempt to register to handle the same element name and namespace,
  * the first entry loaded from the classpath will take precedence. Whenever a stanza extension
  * is found in a packet, parsing will be passed to the correct provider. Each provider
@@ -106,7 +107,8 @@ import org.jivesoftware.smack.util.XmppElementUtil;
  * set the properties of th class using the values in the stanza extension sub-element. When an
  * extension provider is not registered for an element name and namespace combination, Smack will
  * store all top-level elements of the sub-packet in DefaultPacketExtension object and then
- * attach it to the packet.<p>
+ * attach it to the packet.
+ * </p>
  *
  * @author Matt Tucker
  */

smack-core/src/main/java/org/jivesoftware/smack/provider/package-info.java

@@ -16,7 +16,7 @@
  */
 
 /**
- * The Smack provider architecture is a system for plugging in custom XML parsing of staza extensions
+ * The Smack provider architecture is a system for plugging in custom XML parsing of stanza extensions
  * ({@link org.jivesoftware.smack.packet.ExtensionElement}, {@link org.jivesoftware.smack.packet.IQ} stanzas and
  * {@link org.jivesoftware.smack.packet.Nonza}. Hence, there are the the following providers:
  * <ul>

smack-core/src/main/java/org/jivesoftware/smack/proxy/HTTPProxySocketConnection.java

@@ -23,6 +23,7 @@ import java.io.StringReader;
 import java.net.HttpURLConnection;
 import java.net.InetSocketAddress;
 import java.net.Socket;
+import java.nio.charset.StandardCharsets;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -58,7 +59,7 @@ class HTTPProxySocketConnection implements ProxySocketConnection {
             proxyLine = "\r\nProxy-Authorization: Basic " + Base64.encode(username + ":" + password);
         }
         socket.getOutputStream().write((hostport + " HTTP/1.1\r\nHost: "
-            + host + ":" + port + proxyLine + "\r\n\r\n").getBytes("UTF-8"));
+            + host + ":" + port + proxyLine + "\r\n\r\n").getBytes(StandardCharsets.UTF_8));
 
         InputStream in = socket.getInputStream();
         StringBuilder got = new StringBuilder(100);

smack-core/src/main/java/org/jivesoftware/smack/proxy/ProxyInfo.java

@@ -41,6 +41,7 @@ public class ProxyInfo {
     private ProxyType proxyType;
     private final ProxySocketConnection proxySocketConnection;
 
+    @SuppressWarnings("this-escape")
     public ProxyInfo(ProxyType pType, String pHost, int pPort, String pUser,
                         String pPass) {
         this.proxyType = pType;

smack-core/src/main/java/org/jivesoftware/smack/sasl/SASLMechanism.java

@@ -358,7 +358,7 @@ public abstract class SASLMechanism implements Comparable<SASLMechanism> {
      * SASLprep the given String. The resulting String is in UTF-8.
      *
      * @param string the String to sasl prep.
-     * @return the given String SASL preped
+     * @return the given String SASL prepped
      * @see <a href="http://tools.ietf.org/html/rfc4013">RFC 4013 - SASLprep: Stringprep Profile for User Names and Passwords</a>
      */
     protected static String saslPrep(String string) {

smack-core/src/main/java/org/jivesoftware/smack/sasl/core/ScramMechanism.java

@@ -271,6 +271,7 @@ public abstract class ScramMechanism extends SASLMechanism {
         return null;
     }
 
+    @SuppressWarnings("MixedMutabilityReturnType")
     private static Map<Character, String> parseAttributes(String string) throws SmackSaslException {
         if (string.length() == 0) {
             return Collections.emptyMap();

smack-core/src/main/java/org/jivesoftware/smack/util/CollectionUtil.java

@@ -55,6 +55,7 @@ public class CollectionUtil {
         boolean test(T t);
     }
 
+    @SuppressWarnings("NonApiType")
     public static <T> ArrayList<T> newListWith(Collection<? extends T> collection) {
         if (collection == null) {
             return null;

smack-core/src/main/java/org/jivesoftware/smack/util/LazyStringBuilder.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014-2019 Florian Schmaus
+ * Copyright 2014-2023 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,10 +24,12 @@ public class LazyStringBuilder implements Appendable, CharSequence {
 
     private final List<CharSequence> list;
 
-    private String cache;
+    private transient String cache;
+    private int cachedLength = -1;
 
     private void invalidateCache() {
         cache = null;
+        cachedLength = -1;
     }
 
     public LazyStringBuilder() {
@@ -65,9 +67,10 @@ public class LazyStringBuilder implements Appendable, CharSequence {
 
     @Override
     public int length() {
-        if (cache != null) {
-            return cache.length();
+        if (cachedLength >= 0) {
+            return cachedLength;
         }
+
         int length = 0;
         try {
             for (CharSequence csq : list) {
@@ -78,6 +81,8 @@ public class LazyStringBuilder implements Appendable, CharSequence {
             StringBuilder sb = safeToStringBuilder();
             throw new RuntimeException("The following LazyStringBuilder threw a NullPointerException:  " + sb, npe);
         }
+
+        cachedLength = length;
         return length;
     }
 

smack-core/src/main/java/org/jivesoftware/smack/util/MAC.java

@@ -33,7 +33,7 @@ public class MAC {
             HMAC_SHA1 = Mac.getInstance(HMACSHA1);
         }
         catch (NoSuchAlgorithmException e) {
-            // Smack wont be able to function normally if this exception is thrown, wrap it into
+            // Smack won't be able to function normally if this exception is thrown, wrap it into
             // an ISE and make the user aware of the problem.
             throw new IllegalStateException(e);
         }

smack-core/src/main/java/org/jivesoftware/smack/util/MD5.java

@@ -31,7 +31,7 @@ public class MD5 {
             MD5_DIGEST = MessageDigest.getInstance(StringUtils.MD5);
         }
         catch (NoSuchAlgorithmException e) {
-            // Smack wont be able to function normally if this exception is thrown, wrap it into
+            // Smack won't be able to function normally if this exception is thrown, wrap it into
             // an ISE and make the user aware of the problem.
             throw new IllegalStateException(e);
         }

smack-core/src/main/java/org/jivesoftware/smack/util/MultiMap.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2015-2021 Florian Schmaus
+ * Copyright © 2015-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -184,13 +184,14 @@ public class MultiMap<K, V> {
     }
 
     /**
-     * Remove the given number of values for a given key. May return less values then requested.
+     * Remove the given number of values for a given key. May return less values than requested.
      *
      * @param key the key to remove from.
      * @param num the number of values to remove.
      * @return a list of the removed values.
      * @since 4.4.0
      */
+    @SuppressWarnings("MixedMutabilityReturnType")
     public List<V> remove(K key, int num) {
         List<V> values = map.get(key);
         if (values == null) {

smack-core/src/main/java/org/jivesoftware/smack/util/NumberUtil.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2015-2020 Florian Schmaus
+ * Copyright © 2015-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,18 +18,6 @@ package org.jivesoftware.smack.util;
 
 public class NumberUtil {
 
-    /**
-     * Checks if the given long is within the range of an unsigned 32-bit integer, the XML type "xs:unsignedInt".
-     *
-     * @param value TODO javadoc me please
-     * @deprecated use {@link #requireUInt32(long)} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5.
-    public static void checkIfInUInt32Range(long value) {
-        requireUInt32(value);
-    }
-
     /**
      * Checks if the given long is within the range of an unsigned 32-bit integer, the XML type "xs:unsignedInt".
      *

smack-core/src/main/java/org/jivesoftware/smack/util/PacketParserUtils.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software, 2019-2023 Florian Schmaus.
+ * Copyright 2003-2007 Jive Software, 2019-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,6 @@ import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.logging.Level;
@@ -87,7 +86,7 @@ public class PacketParserUtils {
         return parser;
     }
 
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     public static <S extends Stanza> S parseStanza(String stanza) throws XmlPullParserException, SmackParsingException, IOException {
         return (S) parseStanza(getParserFor(stanza), XmlEnvironment.EMPTY);
     }
@@ -230,7 +229,7 @@ public class PacketParserUtils {
                 // Assume this is the end tag of the start tag at the
                 // beginning of this method. Typical examples where this
                 // happens are body elements containing the empty string,
-                // ie. <body></body>, which appears to be valid XMPP, or a
+                // i.e. <body></body>, which appears to be valid XMPP, or a
                 // least it's not explicitly forbidden by RFC 6121 5.2.3
                 return "";
             } else {
@@ -644,7 +643,7 @@ public class PacketParserUtils {
         assert parser.getEventType() == XmlPullParser.Event.START_ELEMENT;
         String name;
         final int initialDepth = parser.getDepth();
-        List<String> methods = new LinkedList<>();
+        List<String> methods = new ArrayList<>();
         outerloop: while (true) {
             XmlPullParser.Event eventType = parser.next();
             switch (eventType) {
@@ -850,7 +849,7 @@ public class PacketParserUtils {
                     throws XmlPullParserException, IOException {
         ParserUtils.assertAtStartTag(parser);
         assert parser.getNamespace().equals(StartTls.NAMESPACE);
-        int initalDepth = parser.getDepth();
+        int initialDepth = parser.getDepth();
         boolean required = false;
         outerloop: while (true) {
             XmlPullParser.Event event = parser.next();
@@ -864,7 +863,7 @@ public class PacketParserUtils {
                 }
                 break;
             case END_ELEMENT:
-                if (parser.getDepth() == initalDepth) {
+                if (parser.getDepth() == initialDepth) {
                     break outerloop;
                 }
                 break;

smack-core/src/main/java/org/jivesoftware/smack/util/PacketUtil.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2021 Florian Schmaus
+ * Copyright © 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,7 +32,7 @@ public class PacketUtil {
      *
      * @return the extension element
      */
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({"unchecked", "TypeParameterUnusedInFormals"})
     public static <PE extends XmlElement> PE extensionElementFrom(Collection<XmlElement> collection,
                     String element, String namespace) {
         for (XmlElement packetExtension : collection) {

smack-core/src/main/java/org/jivesoftware/smack/util/Pair.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2020 Florian Schmaus.
+ * Copyright 2020-2024 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,11 +26,12 @@ public final class Pair<F, S> {
         this.second = second;
     }
 
-    public static <F extends Object, S extends Object> Pair<F, S> create(F first, S second) {
+    public static <F, S> Pair<F, S> create(F first, S second) {
         return new Pair<>(first, second);
     }
 
-    public static <F extends Object, S extends Object> Pair<F, S> createAndInitHashCode(F first, S second) {
+    @SuppressWarnings("ReturnValueIgnored")
+    public static <F, S> Pair<F, S> createAndInitHashCode(F first, S second) {
         Pair<F, S> pair = new Pair<>(first, second);
         pair.hashCode();
         return pair;

smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2014-2023 Florian Schmaus
+ * Copyright © 2014-2024 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,8 +23,6 @@ import java.text.ParseException;
 import java.util.Date;
 import java.util.Locale;
 
-import javax.xml.namespace.QName;
-
 import org.jivesoftware.smack.datatypes.UInt16;
 import org.jivesoftware.smack.datatypes.UInt32;
 import org.jivesoftware.smack.packet.XmlEnvironment;
@@ -146,7 +144,7 @@ public class ParserUtils {
     }
 
     /**
-     * Prase a string to a boolean value as per "xs:boolean". Valid input strings are "true", "1" for true, and "false", "0" for false.
+     * Phrase a string to a boolean value as per "xs:boolean". Valid input strings are "true", "1" for true, and "false", "0" for false.
      *
      * @param booleanString the input string.
      * @return the boolean representation of the input string
@@ -367,19 +365,6 @@ public class ParserUtils {
         return parser.getAttributeValue("http://www.w3.org/XML/1998/namespace", "lang");
     }
 
-    /**
-     * Get the QName of the current element.
-     *
-     * @param parser the parser.
-     * @return the Qname.
-     * @deprecated use {@link XmlPullParser#getQName()} instead.
-     */
-    @Deprecated
-    // TODO: Remove in Smack 4.5
-    public static QName getQName(XmlPullParser parser) {
-        return parser.getQName();
-    }
-
     public static InternetAddress getInternetAddressIngoringZoneIdAttribute(XmlPullParser parser, String attribute) {
         String inetAddressString = parser.getAttributeValue(attribute);
         if (inetAddressString == null) {

smack-core/src/main/java/org/jivesoftware/smack/util/SHA1.java

@@ -31,7 +31,7 @@ public class SHA1 {
             SHA1_DIGEST = MessageDigest.getInstance(StringUtils.SHA1);
         }
         catch (NoSuchAlgorithmException e) {
-            // Smack wont be able to function normally if this exception is thrown, wrap it into
+            // Smack won't be able to function normally if this exception is thrown, wrap it into
             // an ISE and make the user aware of the problem.
             throw new IllegalStateException(e);
         }