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# Migrating OC4J Orion Persistence to OC4J TopLink Persistence

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In 10g (10.1.3.1.0), OC4J is shipped configured to use TopLink as its default persistence manager.

If you upgrade your OC4J to this release, you must migrate persistence configuration from your original `orion-ejb-jar.xml` file to the `toplink-ejb-jar.xml` file.

In this release, Oracle provides a TopLink migration tool that you can use to automate this migration for Release 2 (9.0.4) or later OC4J installations.

After using the TopLink migration tool, you may need to make some additional changes as described in "Post-Migration Changes".

If you encounter problems during migration, see "Troubleshooting Your Migration".

This section explains how to use the TopLink migration tool, including:

- Overview

- Using the TopLink Migration Tool From TopLink Workbench

- Using the TopLink Migration Tool From the Command Line

- Post-Migration Changes

- Troubleshooting Your Migration