java - Hibernate, spring, JPS & isolation - custom isolation not supported

Question

I have been trying this:

@Transactional(isolation=Isolation.SERIALIZABLE, 
               rollbackFor={Exception.class}, 
               propagation=Propagation.REQUIRES_NEW)

on my service methods, but spring complains saying:

Standard JPA does not support custom isolation levels - use a special JpaDialect

How can I resolve this?

Answer 1

No custom isolation levels are supported by JPA. You can extend the HibernateJpaDialect class and override connection-related methods so that you can set custom isolation levels on the Connection

Here's something that I've written, but have not tested yet:

public class HibernateExtendedJpaDialect extends HibernateJpaDialect {

    @Override
    public Object beginTransaction(EntityManager entityManager,
            TransactionDefinition definition) throws PersistenceException,
            SQLException, TransactionException {

        Session session = (Session) entityManager.getDelegate();
        DataSourceUtils.prepareConnectionForTransaction(session.connection(), definition);

        entityManager.getTransaction().begin();

        return prepareTransaction(entityManager, definition.isReadOnly(), definition.getName());
    }

}

And you define this as a property of your EntityManagerFactory:

<property name="jpaDialect">
    <bean class="com.company.util.HibernateExtendedJpaDialect" />
</property>