log.error(ex);
System.err.println(ex);
    public void sendClearPanelMsg() {	int                  tmp[]=new int[1]; tmp[0]=0;	DrawCommand          comm=new DrawCommand(DrawCommand.CLEAR);	ObjectOutputStream   os;	try {	    out.reset();	    os=new ObjectOutputStream(out);	    os.writeObject(comm);	    os.flush();	    data_channel.send(new Message(null, null, out.toByteArray()));	}	catch(Exception ex) {	    log.error(ex);	}    }