How to handle JPA unique constraint violations?

Question

When a unique constraint is violated, a javax.persistence.RollbackException is thrown. But there could be multiple reasons to throw a RollbackException

Answer 1

compiler returns the exception SQLIntegrityConstraintViolationException, while trying to violate unique constraint.

Use the following catch block concept, to handle proper exceptions.

catch(SQLIntegrityConstraintViolationException e) 
{
  // Error message for integrity constraint violation
}
catch(Exception e)
{
 // Other error messages
}