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

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### Use getConnection()

JMS connections are served from a connection pool. This means that calling `getConnection()` on a Queue connection factory is fast.

Caution –

Previous to version 8.1, it was possible to reuse a connection with a servlet or EJB component. That is, the servlet could call `getConnection()` in its `init()` method and then continually call `getSession()` for each servlet invocation. If you use JMS within a global transaction, that no longer works: applications can only call `getSession()` once for each connection. After than, the connection must be closed (which doesn’t actually close the connection; it merely returns it to the pool). This is a general feature of portable J2EE 1.4 applications; the Sun Java System Application Server enforces that restriction where previous (J2EE 1.3-based) application servers did not.

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