THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Since Sun Java System Application Server is based on code from Glassfish project (http://glassfish.dev.java.net), the instructions to use OpenJPA in Glassfish and Sun Java System Application Server remain same.
Integrating with WebSphere Application Server V6.1
See IBM WebSphere Developer Technical Journal: Leveraging OpenJPA with WebSphere Application Server V6.1.