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Don't get programmatical cache invalidation to work [JPA] [message #788063]

Wed, 01 February 2012 05:03

Marian Seitner
Messages: 4
Registered: October 2009

Junior Member

Hi,

my database is externally modified so at some point I need to invalidate the entity cache in my web application.

I wrote a servlet which basically does the following:

@PersistenceContext // injected via Spring
EntityManager em;

JpaEntityManager nativeEm = em.unwrap(JpaEntityManager.class);

// this method always throws an NPE
Session session = nativeEm.getSession();

session.getIdentityMapAccessor().invalidateAll();

I also tried the other flavors of get*Session(), but none of them worked. What is the correct way to get access to an active session?

Thanks,
Marian

Environment:

GlassFish 3.1.1 w/ EclipseLink 2.3.0
MySQL 5.x

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Re: Don't get programmatical cache invalidation to work [JPA] [message #788278 is a reply to message #788063]

Wed, 01 February 2012 10:44

Shaun Smith
Messages: 189
Registered: July 2009

Senior Member

In JPA 2.0, you can use the http://docs.oracle.com/javaee/6/api/javax/persistence/Cache.html#evictAll() method to invalidate the EclipseLink caches. You'll need to inject the EntityManagerFactory and call http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManagerFactory.html#getCache().evictAll().

--Shaun

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Re: Don't get programmatical cache invalidation to work [JPA] [message #788370 is a reply to message #788278]

Wed, 01 February 2012 13:17

Marian Seitner
Messages: 4
Registered: October 2009

Junior Member

Thanks, works like a charm!

However I wonder what would have been the "hard way" using the EclipseLink session... could you give me some pointers? Especially for the problem of not getting a session through the EntityManager...

Thanks,
Marian

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