为什么在MessageConsumer上设置MessageListener不会导致程序在主线程死后继续？

Question

我正在设置一个MessageListener并期望程序仍然会运行（因为监听线程仍处于活动状态），但是在＆＃34;完成后＃34;在屏幕上打印，程序终止。知道为什么会这样，以及如何解决它？

    MessageListener messageListener = new DelegationReceiver();
    Properties p = PropertiesLoader.getProperties("jms.properties");
    InitialContext cntxt = new InitialContext();

    cntxt.addToEnvironment(Context.INITIAL_CONTEXT_FACTORY, p.getProperty("namingFactory"));
    cntxt.addToEnvironment(Context.URL_PKG_PREFIXES, p.getProperty("urlPackages"));
    cntxt.addToEnvironment(Context.PROVIDER_URL,p.getProperty("providerURL"));
    cntxt.addToEnvironment(Context.SECURITY_PRINCIPAL,"default");
    cntxt.addToEnvironment(Context.SECURITY_CREDENTIALS,"password");
    ConnectionFactory tfact = (ConnectionFactory) cntxt.lookup(p.getProperty("topicFactory"));
    Topic topic = (Topic) cntxt.lookup(p.getProperty("myTopic"));
    Connection connection = tfact.createConnection();
    Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    MessageConsumer mc = session.createConsumer(topic);
    mc.setMessageListener(messageListener);
    connection.start();
    System.out.println("Finished");