如何在Spring Boot中使用EntityManager处理异常

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:

1. When database isn't available I have SocketException .
2. 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

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

Answer 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 –