Program: 103083
Project: 103083
Buggy source:
/** 
 * Opens the currently selected chat.
 */
void openChatForSelection(){
  Object selectedValue=this.chatRoomsTableModel.getValueAt(this.chatRoomList.getSelectedRow());
  ChatRoomWrapper chatRoomWrapper;
  if (selectedValue instanceof ChatRoomWrapper)   chatRoomWrapper=(ChatRoomWrapper)selectedValue;
 else   return;
  if (chatRoomWrapper.getChatRoom() == null) {
    chatRoomWrapper=GuiActivator.getUIService().getConferenceChatManager().createChatRoom(chatRoomWrapper.getChatRoomName(),chatRoomWrapper.getParentProvider().getProtocolProvider(),new ArrayList<String>(),"String_Node_Str",false,true);
    if (chatRoomWrapper.getChatRoom().isJoined())     chatRoomWrapper.getChatRoom().leave();
    this.chatRoomsTableModel.setValueAt(chatRoomWrapper,this.chatRoomList.getSelectedRow(),this.chatRoomList.getSelectedColumn());
  }
  String savedNick=ConfigurationUtils.getChatRoomProperty(chatRoomWrapper.getParentProvider().getProtocolProvider(),chatRoomWrapper.getChatRoomID(),"String_Node_Str");
  if (savedNick == null) {
    String[] joinOptions=chatRoomWrapper.getJoinOptions();
    String nickName=joinOptions[0];
    if (nickName == null)     return;
    if (!chatRoomWrapper.getChatRoom().isJoined()) {
      GuiActivator.getUIService().getConferenceChatManager().joinChatRoom(chatRoomWrapper,nickName,null,joinOptions[1]);
    }
  }
 else {
    if (!chatRoomWrapper.getChatRoom().isJoined())     GuiActivator.getUIService().getConferenceChatManager().joinChatRoom(chatRoomWrapper,savedNick,null);
  }
  ChatWindowManager chatWindowManager=GuiActivator.getUIService().getChatWindowManager();
  ChatPanel chatPanel=chatWindowManager.getMultiChat(chatRoomWrapper,true);
  chatWindowManager.openChat(chatPanel,true);
}

Fixed version (ground truth):
/** 
 * Opens the currently selected chat.
 */
void openChatForSelection(){
  Object selectedValue=this.chatRoomsTableModel.getValueAt(this.chatRoomList.getSelectedRow());
  ChatRoomWrapper chatRoomWrapper;
  if (selectedValue instanceof ChatRoomWrapper)   chatRoomWrapper=(ChatRoomWrapper)selectedValue;
 else   return;
  if (chatRoomWrapper.getChatRoom() == null) {
    chatRoomWrapper=GuiActivator.getUIService().getConferenceChatManager().createChatRoom(chatRoomWrapper.getChatRoomName(),chatRoomWrapper.getParentProvider().getProtocolProvider(),new ArrayList<String>(),"String_Node_Str",false,false,true);
    if (chatRoomWrapper.getChatRoom().isJoined())     chatRoomWrapper.getChatRoom().leave();
    this.chatRoomsTableModel.setValueAt(chatRoomWrapper,this.chatRoomList.getSelectedRow(),this.chatRoomList.getSelectedColumn());
  }
  String savedNick=ConfigurationUtils.getChatRoomProperty(chatRoomWrapper.getParentProvider().getProtocolProvider(),chatRoomWrapper.getChatRoomID(),"String_Node_Str");
  if (savedNick == null) {
    String[] joinOptions=chatRoomWrapper.getJoinOptions();
    String nickName=joinOptions[0];
    if (nickName == null)     return;
    if (!chatRoomWrapper.getChatRoom().isJoined()) {
      GuiActivator.getUIService().getConferenceChatManager().joinChatRoom(chatRoomWrapper,nickName,null,joinOptions[1]);
    }
  }
 else {
    if (!chatRoomWrapper.getChatRoom().isJoined())     GuiActivator.getUIService().getConferenceChatManager().joinChatRoom(chatRoomWrapper,savedNick,null);
  }
  ChatWindowManager chatWindowManager=GuiActivator.getUIService().getChatWindowManager();
  ChatPanel chatPanel=chatWindowManager.getMultiChat(chatRoomWrapper,true);
  chatWindowManager.openChat(chatPanel,true);
}