Migrating Applications to the EclipseLink Persistence Manager

You can configure an application server to use EclipseLink as the persistence manager. You can use only one persistence manager for all of the entities with container-managed persistence in a JAR file.

EclipseLink provides automated support for migrating an existing Java EE application to use EclipseLink as the persistence manager. For more information, see "Migrating from Apache OpenJPA to EclipseLink" in Solutions Guide for EclipseLink.