Are any parts of JMS non-thread-safe, thus not reusable across threads?

Are any parts of JMS not thread-safe, thus not concurrently reusable
across threads?  There are several pieces, being the ConnectionFactory,
Connection, Session, Sender, and Message.  I'm not concerned about the
Message object itself, as I don't expect that to be reused, but I am
concerned about the other objects.

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