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Which of the following objects are safe to cache and are thread safe?

Which of the following objects are safe to cache and are thread safe?

We're using JMS to send out e-mail alerts. Can you tell me which of the following objects are safe to cache and are thread safe...
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QueueConnectionFactory
Queue
Connection
QueueSender

All of them are thread-safe, except QueueSender. In summary, only the following JMS classes (and their subclasses) are thread-safe:

- ConnectionFactory
- Connection
- Destination

These are explicitly *not* thread safe:

- Session
- MessageProducer
- MessageConsumer

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This was first published in March 2002

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