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Sunday, October 29, 2006

Persistence Unit or Persistence Context?

Which to use for a particular application depends entirely on the environment, or preference.

  • @PersistenceUnit annotation is used in J5SE applications to handle Java Persistence API (JPA) persistence management. You may use a PeristenceUnit in an application inside a container, but it must be managed by the developer instead of the container.
  • @PersistenceContext annotation is used for Container Managed Persistence (CMP). This relieves the developer of having to worry about connection management.

3 comments:

  1. Unknown24 March, 2008 07:24

    clean & simple

    Thank you

    ReplyDelete
  2. imran raza khan15 December, 2010 03:58

    Hi,

    We cant use PersistenceContext with Servlets.

    Regards,
    imran

    ReplyDelete
  3. John Yeary05 January, 2011 21:42

    I am not sure what the issue could be. I have an example which uses both in a servlet. Using the @PersistenceContext requires more work on the part of the developer.

    Remember @PersistenceUnit uses an EntityManagerFactory, and @PersistenceContext uses an EntityManger.

    ReplyDelete