Spring EntityManager Hibernate Exception Handling

Question

In a Spring, JPA, Hibernate project I'm trying to get exception handling working. For the following code:

    @Repository("mscoutService")
    public class MScoutServiceImpl implements MScoutService, Serializable {

        @PersistenceContext
        private EntityManager em;

...
        @Override
        @Transactional
        public void deleteMission(Long missionId) {
            try {
                Mission mis = em.find(Mission.class, missionId);
                em.remove(mis);
            } catch (Exception e) {
                handle_exception();
            }
        }

I'm trying to catch underlying hibernate/jdbc/db exceptions (for example when dependent entities are still present the remove will fail with a org.springframework.orm.hibernate3.HibernateJdbcException) and perform some actions. However the catch code is never reached (checked in the debugger).

I guess this has to do with the way Spring manages this, but I don't know just how I can catch exceptions during em.remove()...

Any help is appreciated!

Bozho · Accepted Answer · 2011-01-29 22:01:07Z

4

This is because the exception occurs when the session gets flushed. And perhaps it gets flushed when the transaction is committed - i.e. by the spring proxy. If you want to manually flush, you can use entityManager.flush().

answered Jan 29, 2011 at 22:01

Bozho

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3 Comments

Tom Over a year ago

Thanks! adding em.flush() caused the exception handler to catch, so this solved my problem.

oberger Over a year ago

I know this thread is a little old, but would a better way be to handle the exception one layer above the repository where you are using @Transactional? Or is this the preferred way to handle exceptions?

Bozho Over a year ago

yes, it's generally better to do that outside the repository.

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