How to handle exceptions using EntityManager in Spring Boot

Question

I have dao layer:

@Transactional
public class DatabaseCollectionDao implements IDatabaseCollectionDao {

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public void create(Collection collection) {
           entityManager.persist(collection);
    }
}

It works correctly but:

When database isn't available I have SocketException.
When database contains a duplicate key I have SQLIntegrityConstraintViolationException

I am trying to try/catch it inside create method:

@Override
    public void create(Collection collection) {
           try{
               entityManager.persist(collection);
           } catch (SQLIntegrityConstraintViolationException e){
               //do smth
           }
    }

But Intellij says that It is never thrown.
When I try to try/catch Exception i have UnexpectedRollbackException.

How to handle exceptions using JPA entityManager?

update: An attempt to remove @Transactional gave nothing

P.S. To be sure i tried to try/catch it in higher layers. I don't know what i can try more to solve it.

Yes, It works correctly. But when I stop db and try to send request or persist one more time this entity(with the same id) I have a such problem — Donatello
– Donatello, Commented Feb 28, 2019 at 0:55
Maybe you are thinking of Entitymanager::persist ? docs.oracle.com/javaee/7/api/javax/persistence/… — Scary Wombat
– Scary Wombat, Commented Feb 28, 2019 at 1:05

sankar · Accepted Answer · 2019-02-28 02:48:42Z

1

create customException handler extend ResponseEntityExceptionHandler . @ExceptionHandler(ConstraintViolationException::class) fun handleConstraintViolation(ex: ConstraintViolationException, request: WebRequest): ResponseEntity {} this kotlin snippet u can convert to java easily –

answered Feb 28, 2019 at 2:48

sankar

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