solve the memory leak problems which is caused by add LocalMUCRoom objects to...

solve the memory leak problems which is caused by add LocalMUCRoom objects to GroupEventDispatcher but never remove it.

src/java/org/jivesoftware/openfire/muc/spi/MultiUserChatServiceImpl.java

@@ -45,6 +45,7 @@ import org.jivesoftware.openfire.disco.DiscoItem;
 import org.jivesoftware.openfire.disco.DiscoItemsProvider;
 import org.jivesoftware.openfire.disco.DiscoServerItem;
 import org.jivesoftware.openfire.disco.ServerItemsProvider;
+import org.jivesoftware.openfire.event.GroupEventDispatcher;
 import org.jivesoftware.openfire.group.ConcurrentGroupList;
 import org.jivesoftware.openfire.group.GroupAwareList;
 import org.jivesoftware.openfire.group.GroupJID;
@@ -676,6 +677,9 @@ public class MultiUserChatServiceImpl implements Component, MultiUserChatService
 
     private void removeChatRoom(String roomName, boolean notify) {
         MUCRoom room = rooms.remove(roomName);
+		Log.info("removing chat room:" + roomName + "|" + room.getClass().getName());
+		if (room instanceof LocalMUCRoom)
+			GroupEventDispatcher.removeListener((LocalMUCRoom) room);
         if (room != null) {
             totalChatTime += room.getChatLength();
             if (notify) {