ConstraintViolationException in spring rest

Question

I have next spring rest controller for handle my exception:

@ExceptionHandler(ConstraintViolationException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
pub         


        

Answer 1

Reason for TransactionSystemException

1. Hibernate entity manager is responsible for throwing all hibernate exceptions

If you go inside the code AbstractEntityManagerImpl.convert() method, you will see that by default it's not handling any specific exception like ConstraintViolation instead it just throws and wraps in PersistenceException.

2. JPA transaction manager catches the above exception if you are calling your code inside @Transaction and converts to TransactionSystemException,you can see the code of spring JPA transaction manager class="org.springframework.orm.jpa.JpaTransactionManager"

Solution for correctly resolving your exception

1. First register a JPA dialect which can intercept those HibernateExceptions and wrap into specific spring exceptions like this in your transaction manager bean.

HibernateJpaDialect catches those exception and converts to spring specific exceptions like this

if (ex instanceof ConstraintViolationException) {
          ConstraintViolationException jdbcEx = (ConstraintViolationException) ex;
          return new DataIntegrityViolationException(ex.getMessage()  + "; SQL [" + jdbcEx.getSQL() +
                  "]; constraint [" + jdbcEx.getConstraintName() + "]", ex);
      }

2. You can also register that your entitymanager is using hibernate jpaVendorAdapter to be complete that your using hibernate everywhere.

3. Now in your controller you can expect dataIntegrityException which came from hibernate dialect which is thrown because of ConstraintViolationException

@ExceptionHandler(DataIntegrityViolationException.class)