Program: 102943
Project: 102943
Buggy source:
@Override public void onSuccess(IRCChannel channel){
  LOGGER.trace("String_Node_Str" + chatroom.getIdentifier() + "String_Node_Str");
  ChatRoomIrcImpl actualChatRoom=chatroom;
synchronized (joinSignal) {
    try {
      if (!channel.getName().equals(actualChatRoom.getIdentifier())) {
        actualChatRoom=new ChatRoomIrcImpl(channel.getName(),IrcStack.this.provider);
        MessageIrcImpl message=new MessageIrcImpl("String_Node_Str" + channel.getName(),"String_Node_Str","String_Node_Str",null);
        IrcStack.this.provider.getMUC().registerChatRoomInstance(actualChatRoom);
        chatroom.fireMessageReceivedEvent(message,null,new Date(),MessageReceivedEvent.SYSTEM_MESSAGE_RECEIVED);
      }
      IrcStack.this.joined.put(actualChatRoom.getIdentifier(),actualChatRoom);
      IrcStack.this.irc.addListener(new ChatRoomListener(actualChatRoom));
      IRCTopic topic=channel.getTopic();
      actualChatRoom.updateSubject(topic.getValue());
      for (      IRCUser user : channel.getUsers()) {
        ChatRoomMemberRole role=ChatRoomMemberRole.SILENT_MEMBER;
        Set<IRCUserStatus> statuses=channel.getStatusesForUser(user);
        for (        IRCUserStatus status : statuses) {
          role=convertMemberMode(status.getChanModeType().charValue());
        }
        if (IrcStack.this.getNick().equals(user.getNick())) {
          actualChatRoom.prepUserRole(role);
        }
 else {
          ChatRoomMemberIrcImpl member=new ChatRoomMemberIrcImpl(IrcStack.this.provider,actualChatRoom,user.getNick(),role);
          actualChatRoom.addChatRoomMember(member.getContactAddress(),member);
        }
      }
    }
  finally {
      IrcStack.this.provider.getMUC().fireLocalUserPresenceEvent(actualChatRoom,LocalUserChatRoomPresenceChangeEvent.LOCAL_USER_JOINED,null);
      LOGGER.trace("String_Node_Str" + "String_Node_Str" + chatroom.getIdentifier() + "String_Node_Str");
      joinSignal.setDone();
      joinSignal.notifyAll();
    }
  }
}

Fixed version (ground truth):
@Override public void onSuccess(IRCChannel channel){
  LOGGER.trace("String_Node_Str" + chatroom.getIdentifier() + "String_Node_Str");
  ChatRoomIrcImpl actualChatRoom=chatroom;
synchronized (joinSignal) {
    try {
      if (!channel.getName().equalsIgnoreCase(actualChatRoom.getIdentifier())) {
        actualChatRoom=new ChatRoomIrcImpl(channel.getName(),IrcStack.this.provider);
        MessageIrcImpl message=new MessageIrcImpl("String_Node_Str" + channel.getName(),"String_Node_Str","String_Node_Str",null);
        IrcStack.this.provider.getMUC().registerChatRoomInstance(actualChatRoom);
        chatroom.fireMessageReceivedEvent(message,null,new Date(),MessageReceivedEvent.SYSTEM_MESSAGE_RECEIVED);
      }
      IrcStack.this.joined.put(actualChatRoom.getIdentifier(),actualChatRoom);
      IrcStack.this.irc.addListener(new ChatRoomListener(actualChatRoom));
      IRCTopic topic=channel.getTopic();
      actualChatRoom.updateSubject(topic.getValue());
      for (      IRCUser user : channel.getUsers()) {
        ChatRoomMemberRole role=ChatRoomMemberRole.SILENT_MEMBER;
        Set<IRCUserStatus> statuses=channel.getStatusesForUser(user);
        for (        IRCUserStatus status : statuses) {
          role=convertMemberMode(status.getChanModeType().charValue());
        }
        if (IrcStack.this.getNick().equals(user.getNick())) {
          actualChatRoom.prepUserRole(role);
        }
 else {
          ChatRoomMemberIrcImpl member=new ChatRoomMemberIrcImpl(IrcStack.this.provider,actualChatRoom,user.getNick(),role);
          actualChatRoom.addChatRoomMember(member.getContactAddress(),member);
        }
      }
    }
  finally {
      IrcStack.this.provider.getMUC().fireLocalUserPresenceEvent(actualChatRoom,LocalUserChatRoomPresenceChangeEvent.LOCAL_USER_JOINED,null);
      LOGGER.trace("String_Node_Str" + "String_Node_Str" + chatroom.getIdentifier() + "String_Node_Str");
      joinSignal.setDone();
      joinSignal.notifyAll();
    }
  }
}