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container managed transactions + shared cache eviction [message #1008215]

Mon, 11 February 2013 09:27

Who Cares
Messages: 2
Registered: February 2013

Junior Member

Hi there

I'm trying to understand how I can evict the shared cache from an EJB.

Obviously, this doesn't work:

@PersistenceContext(unitName="pu")
private EntityManager em;

public void persist(Entity entity) {
  em.persist(entity);
  em.flush();
  em.getEntityManagerFactory().getCache().evictAll();
}

Since the transaction is container managed and the cache is evicted before the transaction completes, there still is stale data.

Any suggestion?

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Re: container managed transactions + shared cache eviction [message #1008286 is a reply to message #1008215]

Mon, 11 February 2013 13:59

Super User
Messages: 9
Registered: January 2013

Junior Member

Hi,
In which way do you check is data stale?

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Re: container managed transactions + shared cache eviction [message #1008302 is a reply to message #1008286]

Mon, 11 February 2013 15:00

Chris Delahunt
Messages: 863
Registered: July 2009

Senior Member

em.getEntityManagerFactory().getCache().evictAll(); operates on the shared second level cache, but the EntityManager itself still has a cache of managed entities. You can simply call em.clear() after em.flush() to detach all managed entities.

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Re: container managed transactions + shared cache eviction [message #1008388 is a reply to message #1008286]

Tue, 12 February 2013 04:47

Who Cares
Messages: 2
Registered: February 2013

Junior Member

Super User wrote on Mon, 11 February 2013 13:59

Hi,
In which way do you check is data stale?

By comparing the JAX-RS responses and the database content.

Quote:

em.getEntityManagerFactory().getCache().evictAll(); operates on the shared second level cache, but the EntityManager itself still has a cache of managed entities. You can simply call em.clear() after em.flush() to detach all managed entities.

thank you

em.flush();
em.clear();
em.getEntityManagerFactory().getCache().evictAll();

Seems to work.
Need to do a bit more testing.

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