Fix some NPEs in jabber provider and fixing build.

src/net/java/sip/communicator/impl/protocol/jabber/ContactGroupJabberImpl.java

@@ -96,7 +96,10 @@ public class ContactGroupJabberImpl
                         ServerStoredContactListJabberImpl ssclCallback,
                         boolean isResolved)
     {
-        this.id = rosterGroup.getName();
+        // rosterGroup can be null when creating volatile contact group
+        if(rosterGroup != null)
+            this.id = rosterGroup.getName();
+
         this.isResolved = isResolved;
         this.ssclCallback = ssclCallback;
 

src/net/java/sip/communicator/impl/protocol/jabber/ContactJabberImpl.java

@@ -82,7 +82,10 @@ public class ContactJabberImpl
                    boolean isPersistent,
                    boolean isResolved)
     {
-        this.jid = rosterEntry.getUser();
+        // rosterEntry can be null when creating volatile contact
+        if(rosterEntry != null)
+            this.jid = rosterEntry.getUser();
+
         this.ssclCallback = ssclCallback;
         this.isPersistent = isPersistent;
         this.isResolved = isResolved;

src/net/java/sip/communicator/impl/protocol/jabber/OperationSetPersistentPresenceJabberImpl.java

@@ -786,6 +786,7 @@ else if(evt.getNewState() == RegistrationState.UNREGISTERED
                 fireProviderStatusChangeEvent(oldStatus, currentStatus);
 
                 ssContactList.cleanup();
+                subscribtionPacketListener = null;
 
                 if(parentProvider.getConnection() != null &&
                     parentProvider.getConnection().getRoster() != null)

src/net/java/sip/communicator/impl/protocol/jabber/OperationSetTypingNotificationsJabberImpl.java

@@ -266,8 +266,11 @@ else if(evt.getNewState() == RegistrationState.UNREGISTERED
 
                 smackChatManagerListener = null;
 
-                messageEventManager.destroy();
-                messageEventManager = null;
+                if(messageEventManager != null)
+                {
+                    messageEventManager.destroy();
+                    messageEventManager = null;
+                }
             }
         }
     }

src/net/java/sip/communicator/impl/protocol/jabber/ServerStoredContactListJabberImpl.java

@@ -696,7 +696,9 @@ void cleanup()
             imageRetriever = null;
         }
 
-        this.roster.removeRosterListener(rosterChangeListener);
+        if(this.roster != null)
+            this.roster.removeRosterListener(rosterChangeListener);
+
         this.rosterChangeListener = null;
         this.roster = null;
     }

src/net/java/sip/communicator/impl/protocol/jabber/VolatileContactGroupJabberImpl.java

@@ -44,6 +44,7 @@ public class VolatileContactGroupJabberImpl
      * Returns the name of this group.
      * @return a String containing the name of this group.
      */
+    @Override
     public String getGroupName()
     {
         return contactGroupName;
@@ -54,6 +55,7 @@ public String getGroupName()
      * JabberGroup.GroupName[size]{ buddy1.toString(), buddy2.toString(), ...}.
      * @return  a String representation of the object.
      */
+    @Override
     public String toString()
     {
         StringBuffer buff = new StringBuffer("VolatileJabberGroup.");
@@ -77,6 +79,7 @@ public String toString()
      * containing non persistent contacts.
      * @return true if the contact group is persistent and false otherwise.
      */
+    @Override
     public boolean isPersistent()
     {
         return false;

src/net/java/sip/communicator/impl/protocol/jabber/VolatileContactJabberImpl.java

@@ -34,6 +34,7 @@ public class VolatileContactJabberImpl
      * Returns the Jabber Userid of this contact
      * @return the Jabber Userid of this contact
      */
+    @Override
     public String getAddress()
     {
         return contactId;
@@ -46,6 +47,7 @@ public String getAddress()
      * @return a String that can be used for referring to this contact when
      * interacting with the user.
      */
+    @Override
     public String getDisplayName()
     {
         return contactId;
@@ -57,6 +59,7 @@ public String getDisplayName()
      *
      * @return  a string representation of this contact.
      */
+    @Override
     public String toString()
     {
         StringBuffer buff =  new StringBuffer("VolatileJabberContact[ id=");
@@ -71,9 +74,9 @@ public String toString()
      * containing non persistent contacts.
      * @return true if the contact group is persistent and false otherwise.
      */
+    @Override
     public boolean isPersistent()
     {
         return false;
     }
-
 }