EclipseLink/UserGuide/JPA/Advanced JPA Development/Customizers
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EclipseLink allows extended configuration of the ORM meta-data through Java code. EclipseLink provides a descriptor and mapping API that allows its meta-data to be accessed and configured through Java code. EclipseLink also provides a session API that allows the persistence unit meta-data to be accessed and configured through Jacva code. The APIs allows access to certain extended features not provided through annotations or XML. They also allow usage of custom extensions, allow configurations that are only possible through code, and allow easier configuration of defaults or computed configurations.
EclipseLink provides two types of customizers:
- DescriptorCustomizer : defines an interface to customize the mapping meta-data for a class.
- SessionCustomizer : defines an interface to customize the meta-data for a persistence unit, or a set of its classes.