问只要activemq连接没有关闭，我的简单程序就不会完成并退出

EN

    public static void main(String[] args) throws Throwable
    {
        final ActiveMQConnectionFactory conFactory = new ActiveMQConnectionFactory("tcp://localhost:61616");
        final QueueConnection connection = conFactory.createQueueConnection();
        final Session session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
        final Destination destination = new ActiveMQQueue("MJ_SAF");
        final MessageProducer producer = session.createProducer(destination);

        Message message = session.createTextMessage("test");
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, 20);
        message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD, 1);
        message.setIntProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT, 1);
        producer.send(message);
}