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# Persistence Manager Migration

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From the perspective of an application server, TopLink is a persistence manager. You can configure an application server to use TopLink as the default persistence manager.

You can only use one persistence manager for all the entity beans with container-managed persistence in a JAR file.

TopLink provides automated support for migrating an existing J2EE application to use TopLink as the persistence manager. For more information, see the following:

- "Migrating OC4J Orion Persistence to OC4J TopLink Persistence"

- "Migrating BEA WebLogic Persistence to OC4J TopLink Persistence"