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Don't get programmatical cache invalidation to work [JPA] [message #788067]

Wed, 01 February 2012 05:03

Eclipse User

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

Re: Don't get programmatical cache invalidation to work [JPA] [message #788276 is a reply to message #788067]

Wed, 01 February 2012 10:44

Eclipse User

In JPA 2.0, you can use the Cache.evictAll() method to invalidate the EclipseLink caches. You'll need to inject the EntityManagerFactory and call emf.getCache().evictAll().

--Shaun

Re: Don't get programmatical cache invalidation to work [JPA] [message #788373 is a reply to message #788276]

Wed, 01 February 2012 13:17

Eclipse User

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

Re: Don't get programmatical cache invalidation to work [JPA] [message #788380 is a reply to message #788373]

Wed, 01 February 2012 13:35

Eclipse User

You should have called getServerSession() on the JpaEntityManager. The ServerSession is the object that underlies the EntityManagerFactory.

--Shaun

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