java.lang.AssertionError: Chat room jscreenpicker@muc.kenai.com already joined
   at org.netbeans.modules.kenai.collab.chat.KenaiConnection.join(KenaiConnection.java:247)
   at org.netbeans.modules.kenai.collab.chat.ChatPanel.<init>(ChatPanel.java:408)
   at org.netbeans.modules.kenai.collab.chat.ChatTopComponent.setActiveGroup(ChatTopComponent.java:312)
   at org.netbeans.modules.kenai.collab.chat.GroupListItem.openChat(GroupListItem.java:93)
   at org.netbeans.modules.kenai.collab.chat.ContactList.contactJListMouseClicked(ContactList.java:288)
   at org.netbeans.modules.kenai.collab.chat.ContactList.access$200(ContactList.java:64)
   at org.netbeans.modules.kenai.collab.chat.ContactList$4.mouseClicked(ContactList.java:179)
   at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
   at java.awt.Component.processMouseEvent(Component.java:6351)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
   at java.awt.Component.processEvent(Component.java:6113)
   at java.awt.Container.processEvent(Container.java:2085)
   at java.awt.Component.dispatchEventImpl(Component.java:4714)
   at java.awt.Container.dispatchEventImpl(Container.java:2143)
   at java.awt.Component.dispatchEvent(Component.java:4544)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4618)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4291)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4212)
   at java.awt.Container.dispatchEventImpl(Container.java:2129)
   at java.awt.Window.dispatchEventImpl(Window.java:2475)
   at java.awt.Component.dispatchEvent(Component.java:4544)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:635)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)