Persistence Unit or Persistence Context?

Sunday, October 29, 2006

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.

Unknown said...: clean & simple

Thank you; 24 March, 2008 07:24
imran raza khan said...: Hi,

We cant use PersistenceContext with Servlets.

Regards,
imran; 15 December, 2010 03:58
John Yeary said...: 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.; 05 January, 2011 21:42

Java Evangelist John Yeary