DefaultMessageListenerContainer消息应答方式

    AbstractMessageListenerContainer类
protected void commitIfNecessary(Session session, Message message) throws JMSException {
         // Commit session or acknowledge message.
         if (session.getTransacted()) {
             // Commit necessary - but avoid commit call within a JTA transaction.
             if (isSessionLocallyTransacted(session)) {
                 // Transacted session created by this container -> commit.
                 JmsUtils.commitIfNecessary(session);
             }
         }
         else if (message != null && isClientAcknowledge(session)) {
             message.acknowledge();
         }
     }
JmsAccessor类
    protected boolean isClientAcknowledge(Session session) throws JMSException {
         return (session.getAcknowledgeMode() == Session.CLIENT_ACKNOWLEDGE);
     }