Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Performance Tuning Guide

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### Limit Use of JMS Connections

When designing an application that uses JMS connections make sure you use a methodology that sparingly uses connections, by either pooling them or using the same connection for multiple sessions.

The JMS connection uses two threads and the sessions use one thread each. Since these threads are not taken from a pool and the resultant objects aren’t pooled, you could run out of memory during periods of heavy usage.

One workaround is to move `createTopicConnection` into the `init` of the servlet.

Make sure to specifically close the session, or it will stay open, which ties up resources.

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- Next: Chapter 3 Tuning the Application Server

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