与消息侦听器的事务会话，消息未被占用

Question

我正在使用Websphere java类在我的应用程序中实现jms。

发件人代码：

        MQQueueConnectionFactory connectionFactory = new MQQueueConnectionFactory();
        connectionFactory.setHostName(environment.getProperty(MQ_CONNECTION_HOSTNAME));
        connectionFactory.setPort(Integer.parseInt(environment.getProperty(MQ_CONNECTION_PORT)));
        connectionFactory.setQueueManager(environment.getProperty(MQ_CONNECTION_QMANAGER));
        connectionFactory.setChannel(environment.getProperty(MQ_CONNECTION_CHANNEL));
        connectionFactory.setTransportType(1);
        final String username = environment.getProperty(MQ_CONNECTION_USERNAME);
        final String password = environment.getProperty(MQ_CONNECTION_PASSWORD);
        MQQueueConnection connection = null;
        if(username != null && username.trim().length() > 0 && password != null && password.trim().length() > 0) {
            connection = (MQQueueConnection) connectionFactory.createQueueConnection(username, password);
        }
        else {
            connection = (MQQueueConnection) connectionFactory.createQueueConnection();
        }
        senderSession = (MQQueueSession) connection.createQueueSession(true, Session.AUTO_ACKNOWLEDGE);            
        MQQueue queue = (MQQueue) senderSession.createQueue("queue:///" + environment.getProperty(MQ_CONNECTION_QUEUE));
        MQQueueSender sender =  (MQQueueSender) senderSession.createSender(queue);
        JMSMessage message = (JMSMessage)senderSession.createTextMessage(messageContent);
        connection.start();          
        sender.send(message);
        message.acknowledge()

接收器代码：

 final MQQueueConnection connection = (MQQueueConnection) (useAuth ? connectionFactory.createQueueConnection(username, password) :      connectionFactory.createQueueConnection());
    connection.start();
    final MQQueueSession receiverSession = (MQQueueSession) connection.createQueueSession(true, Session.CLIENT_ACKNOWLEDGE);
    final MQQueue queue = MQQueue)receiverSession.createQueue(queueName);
    MQQueueReceiver receiver = createReceiver(session, queue);
    receiver.setMessageListener(listener);

当我使用这些设置发送消息时，消息侦听器从不接收任何消息。但当我打开两个transactiond为false的会话时，一切似乎都很好。我能理解原因。我想进行事务会话。

如果需要任何其他详细信息，请告诉我。

Answer 1

如果您想使用本地事务（syncpoint），那么在发送消息后，您需要提交它。即

senderSession.commit();

Answer 2

消息。不需要来自发送方的Acknowledge（）。它只能在接收方和具有确认类型ClientAcknowledge的会话中使用。此调用将通知消息传递提供程序（在本例中为MQ）从队列中删除当前和以前接收到的所有消息。