How to validate before saving and throw checked exception

emazzotta :

I have the following scenario:

• There's a user repository which can save/update a user
• I want to validate the user's firstname/lastname (perform some string operations) before saving/updating
• If the user's firstname/lastname is < 2 character after having performed the operations, a checked custom UnacceptableStringValueException should be thrown

Note that many services access the user repository, so it's cumbersome to implement new logic directly before saving.

What I tried to do in order to perform the validation just before saving/updating without having to implement this for every save/update call explicitly, is to use a JPA listener. Using @PrePersist and @PreUpdate I achieved the goal of performing the validation before each save/update. However there are two problems with this solution:

• The checked exception is not enforced on the methods which save/update a user and the exception gets automatically wrapped as a RuntimeException via the listener
• When trying to use AOP to catch said RuntimeException and unpack the original checked exception, I keep getting org.springframework.transaction.UnexpectedRollbackException: Transaction silently rolled back because it has been marked as rollback-only

Note that a simple service layer performing the check before saving/updating the user won't solve my use case because there's a user role repository which could also save/update a user (@ManyToOne(optional = false, cascade = CascadeType.PERSIST))

What's a good way to solve the constraints described in the scenario on top?

emazzotta :

I found a somewhat viable solution by fixing the org.springframework.transaction.UnexpectedRollbackException: Transaction silently rolled back because it has been marked as rollback-only error.

The problem was, that the checked exception caused an unexpected rollback, in order to fix this, I added my custom checked exception to the exceptions which can be rolled back like this: @Transactional(rollbackFor = {UnacceptableStringValueException.class})