gistfile1.txt

   public void returnBlocking(Exception cause)
   {
      lock.lock();

      try
      {
         HornetQException ex = HornetQClientMessageBundle.BUNDLE.unblockingACall();
         ex.initCause(cause);
         response = new HornetQExceptionMessage(ex);

         sendCondition.signal();
      }
      finally
      {
         lock.unlock();
      }
   }