At transaction level you can track when the message is being dequeued from the input source and when the message transaction ends.
在事务级别，您可以跟踪消息何时从输入源中的队列离开，以及消息事务何时结束。
When the message is dequeued, typically by an MDB in J2EE, the original caller's identity is not available.
当消息离开队列时(在J2EE中通常由MDB将消息从队列取出)，原始调用方的标识将不可用。
When the message is dequeued again, the same condition occurs.
当该讯息再度从伫列移除时，相同情况还会发生。
When the message is dequeued again, the same condition occurs.
当该讯息再度从伫列移除时，相同情况还会发生。
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