JMS 1.1 持久订阅 - 无法设置客户端 ID

Question

I am trying to setup a durable subscription with JMS 1.1 but I get in a Catch 22:

• if I don't set the clientID, I get a "clientID cannot be null" error...
• if I try to set it, I get: com.ibm.msg.client.jms.DetailedIllegalStateException: JMSCC3031: A client ID cannot be set after connection has been used. The client ID of a connection can be set only once, and only before the connection is used. Set the client ID before using the connection.

How do I solve this? How do I make the connection 'unused'? Or - as the exception message suggests - how do I set the ID before I use the connection?

My code snippet:

public class BbsListener implements MessageListener {

...

public BbsListener(BbsListenerConfig config) {
    try {
        Context context = new InitialContext();
        TopicConnectionFactory topicConnectionFactory = (TopicConnectionFactory) context.lookup(config.getConnectionFactoryName());
        TopicConnection topicConnection = topicConnectionFactory.createTopicConnection();
        topicConnection.setClientID("ID");
        TopicSession topicSession = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
        Topic topic = (Topic) context.lookup(config.getTopicName());
        topicSubscriber = topicSession.createDurableSubscriber(topic, "EAMPtestSubscriber");
        topicSubscriber.setMessageListener(this);
        topicConnection.start();
    }
    
...

Thank you

Answer 1

It looks like your app is running on a Java EE application server. If that's the case you'll need to be careful about what kind of connection factory you use and where you invoke setMessageListener() . First, an "outbound" connection factory is meant to be used for sending messages (hence the name "outbound"). This is part of JCA. Second, you can't call setMessageListener() in an EJB as that's not allowed by spec. I recommend you just use a normal JMS connection factory rather than a pooled one from the application server.