How do I catch the constraint violation exception from EclipseLink?

Question

I am using EclipseLink in my web application, and I am having a hard time gracefully catching and handling Exceptions it generates. I see from this thread what seems to be a si

Answer 1

I'm using Spring Boot 1.1.9 + EclipseLink 2.5.2. This is the only way I can catch ConstraintViolationException. Note that my handleError(ConstraintViolationException) is a very simple implementation which just returns the first violation it finds.

Note that this code was also required when I switched to Hibernate 4.3.7 and Hibernate Validator 5.1.3.

It seems that adding PersistenceExceptionTranslationPostProcessor exceptionTranslation() to my persistence JavaConfig class also has no effect.

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import javax.persistence.RollbackException;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.transaction.TransactionSystemException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice
class GlobalExceptionHandler
{
    @ExceptionHandler(TransactionSystemException.class)
    public ResponseEntity