In chapter 12, validatingLifecycle example,
I modified this to make the example easier to understand:
I first add id=10, name=Jason, vacation= 111 to the database.
Then, when I remove Jason, it throws an exception like this:
javax.validation.ConstraintViolationException: Bean Validation constraint(s) violated while executing Automatic Bean Validation on callback event:'preRemove'
Then, I update Jason's vacation = 1.
Then, I remove Jason. It works.
When Jason is removed from the front-end, the automated validation occurs before Jason is removed without exception.