CODEWITHSUNDEEP
cachingjbossentitymanager
Dmitry
Dmitry

Reputation: 41

Globally disable EntityManager cache in jboss

Is it possible to disable caching with EntityManager in some jboss config?

I'll explain. I have some final "ear" of our product that is using EntityManager through hibernate (something like this, i an newbie to this) and I need to test some behaviour. The easy way for me is to change(remove, create) state of entities direct in the database. But after i did this, the application remain to find old values for some time. I've read about some jboss cache, that is used for entity-manager.

So, for testing, i want to disable EntityManager cache, but it can not be disabled on application-level, only on jboss-level.

In brief: i need application always to reload actual entity state, because it can be edited in database with come other application. And its impossible to disable caching on application-level(hibernate.xml and other)

PS: jboss 4.2.3, ejb3, hibernate3

Upvotes: 1

Views: 569

Answers (1)

kostja
kostja

Reputation: 61578

The cache you are referring to is probably the PersistenceContext. It cannot be disabled. You can only tweak it's scope. In a Java EE environment, the scope of the persistence context is the transaction per default. So if you need for some changes to take effect immediately, you can extract these changes (including fetching the entities in question) into a separate method and annotate it to require a new transaction:

@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)

Once the method returns, all changes are committed.

You could also use bean managed transactions, so you can control the commit yourself. For this, annotate your bean with @TransactionManagement( TransactionManagementType.BEAN ) and use UserTransaction:

@Resource
private UserTransaction tx;
...
tx.begin();
//do stuff
tx.commit();

Upvotes: 1

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