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# EJB 3.0 Persistence Manager Customization

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For an EJB 3.0 persistent application deployed to OC4J, you customize the TopLink persistence manager by creating a TopLink project XML file named `toplink-ejb-jar.xml` and a TopLink session XML file named `ejb3-toplink-sessions.xml` and packaging them in the `META-INF` directory of the EJB-JAR that contains your entities. For more information, see "Customizing the TopLink Persistence Manager in an EJB 3.0 Application" in the Oracle Containers for J2EE Enterprise JavaBeans Developer's Guide.