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The JPA spec requires some type of monitoring of Entity objects, but the spec does not define how to implement this monitoring. Some JPA providers auto-generate new subclasses or proxy objects that front the user's Entity objects at runtime, while others use byte-code weaving technologies to enhance the actual Entity class objects at build time. OpenJPA supports both enhancement methods, but strongly suggests only using the build time enhancement. The following Entity Enhancement page includes more details on both enhancement types, along with examples on how to setup build time enhancement in ANT, Maven and Eclipse environments.

Upcoming JPA 2.0 Features

Tools

OpenJPA provides several design-time and runtime tools, to perform such tasks as entity enhancement, schema mapping, generating metamodel classes and to help migrate from other JPA providers. Please checkout the Tools page for more details.

FAQ

Some common questions concerning the history, architecture and usage of OpenJPA can be found on the FAQ pageIf you really want to be on the bleeding edge, then checkout our JPA 2.0 Roadmap to see which new features of JSR-317 we have implemented on trunk.

Take the Red Pill

If you want to dive into the rabbit-hole (Hey, It's open source!), then checkout the Found a Bug page, which covers everything from posting questions to our mailing lists, to getting the source code and building it, and creating bug patches....

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