Add SmackAndOsgiInitializer

OSGi ServiceComponents need the activate method, make sure it exists for
every SmackInitializer by using this class.

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

@@ -0,0 +1,28 @@
+/**
+ *
+ * Copyright 2014 Florian Schmaus
+ *
+ * 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.initializer;
+
+public abstract class SmackAndOsgiInitializer implements SmackInitializer {
+
+    /**
+     * A simple wrapper around {@link #initialize} for OSGi, as the activate method of a component
+     * must have a void return type.
+     */
+    public final void activate() {
+        initialize();
+    }
+}

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

@@ -34,17 +34,9 @@ import org.jivesoftware.smack.util.FileUtils;
  * 
  * @author Florian Schmaus
  */
-public abstract class UrlInitializer implements SmackInitializer {
+public abstract class UrlInitializer extends SmackAndOsgiInitializer {
     private static final Logger LOGGER = Logger.getLogger(UrlInitializer.class.getName());
 
-    /**
-     * A simple wrapper around {@link #initialize} for OSGi, as the activate method of a component
-     * must have a void return type.
-     */
-    public final void activate() {
-        initialize();
-    }
-
     @Override
     public List<Exception> initialize() {
         return initialize(this.getClass().getClassLoader());

smack-resolver-javax/src/main/java/org/jivesoftware/smack/util/dns/javax/JavaxResolver.java

@@ -28,7 +28,7 @@ import javax.naming.directory.Attributes;
 import javax.naming.directory.DirContext;
 import javax.naming.directory.InitialDirContext;
 
-import org.jivesoftware.smack.initializer.SmackInitializer;
+import org.jivesoftware.smack.initializer.SmackAndOsgiInitializer;
 import org.jivesoftware.smack.util.DNSUtil;
 import org.jivesoftware.smack.util.dns.DNSResolver;
 import org.jivesoftware.smack.util.dns.SRVRecord;
@@ -39,7 +39,7 @@ import org.jivesoftware.smack.util.dns.SRVRecord;
  * @author Florian Schmaus
  *
  */
-public class JavaxResolver implements DNSResolver, SmackInitializer {
+public class JavaxResolver extends SmackAndOsgiInitializer implements DNSResolver {
     
     private static JavaxResolver instance;
     private static DirContext dirContext;