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4. Conclusion

This tutorial, "Java 5 Persistence in Practice," has provided examples for building multi-tier architectures where

  • data access is controlled by a JPA layer
  • the [service] and [DAO] layers run within a Spring or EJB3 container

We concluded with an example of a web application bringing all the layers together:

Although this tutorial is quite long, it is by no means exhaustive:

  • some JPA topics were not covered (entity caching, translating the concept of object inheritance into a DBMS schema, etc.)
  • Difficulties were encountered, reported but not resolved, particularly regarding the use of the EJB3 container.

Readers should therefore consider this document only as a starting point for their first steps with Java 5 persistence.

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This tutorial written by Serge Tahé is made available to the public under the terms of the Creative Commons Attribution – Non-Commercial – ShareAlike 3.0 Unported.