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。

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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。

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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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