Retain smack-core API

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

@@ -280,6 +280,16 @@ public final class SmackConfiguration {
         compressionHandlers.add(xmppInputOutputStream);
     }
 
+    /**
+     * Get compression handlers.
+     *
+     * @deprecated use {@link #getCompressionHandlers()} instead.
+     */
+    @Deprecated
+    public static List<XMPPInputOutputStream> getCompresionHandlers() {
+        return getCompressionHandlers();
+    }
+
     public static List<XMPPInputOutputStream> getCompressionHandlers() {
         List<XMPPInputOutputStream> res = new ArrayList<>(compressionHandlers.size());
         for (XMPPInputOutputStream ios : compressionHandlers) {

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

@@ -215,6 +215,14 @@ public abstract class IQ extends Stanza {
      */
     protected abstract IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml);
 
+    /**
+     * @deprecated use {@link #initializeAsResultFor(IQ)} instead.
+     */
+    @Deprecated
+    protected final void initialzeAsResultFor(IQ request) {
+        initializeAsResultFor(request);
+    }
+
     protected final void initializeAsResultFor(IQ request) {
         if (!(request.getType() == Type.get || request.getType() == Type.set)) {
             throw new IllegalArgumentException(

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

@@ -17,6 +17,17 @@
 package org.jivesoftware.smack.util;
 
 public class ByteUtils {
+
+    /**
+     * Concatenate two byte arrays.
+     *
+     * @deprecated use {@link #concat(byte[], byte[])} instead.
+     */
+    @Deprecated
+    public static byte[] concact(byte[] arrayOne, byte[] arrayTwo) {
+        return concat(arrayOne, arrayTwo);
+    }
+
     public static byte[] concat(byte[] arrayOne, byte[] arrayTwo) {
         int combinedLength = arrayOne.length + arrayTwo.length;
         byte[] res = new byte[combinedLength];

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

@@ -22,6 +22,22 @@ import org.jivesoftware.smack.packet.ExtensionElement;
 
 public class PacketUtil {
 
+    /**
+     * Get a extension element from a collection.
+     * @param collection
+     * @param element
+     * @param namespace
+     * @param <PE>
+     * @return the extension element
+     * @deprecated use {@link #extensionElementFrom(Collection, String, String)} instead.
+     */
+    @Deprecated
+    public static <PE extends ExtensionElement> PE packetExtensionfromCollection(
+            Collection<ExtensionElement> collection, String element,
+            String namespace) {
+        return extensionElementFrom(collection, element, namespace);
+    }
+
     /**
      * Get a extension element from a collection.
      *