The interceptor doesn't catch JDBC exceptions if it occur in a nested @Transactional method.

[matadini]

Hello everyone.

I have the following problem/question: what am I doing wrong?

1. I have an application with a MainService where I call the @Transactional method response() via REST API.
2. Inside the response() method, I call a method from another service, NastedService.anotherSave(), which is also @Transactional.
3. Sometimes the NastedService.anotherSave() method throws a database-related exception, which is a normal situation.
4. I would like to catch all exceptions (related to the database) from the MainService and NastedService using an interceptor. (ExceptionRepacker)
   I want to wrap the exceptions so that the REST layer in the application only has information about domain/service errors.
   My case makes more sense if the application is divided into artifacts, per layer.
5. Unfortunately, the Interceptor does not catch errors thrown by Hibernate. Interestingly, if I throw an exception manually, the Interceptor works. For example:

@Override
@Transactional
public void anotherSave(int i) {
    // Expect that the interceptor will catch the error"
    if (i % 5 == 0) {
        // throw exception, invalid save try: interceptor does not catch it
        Product entity = new Product();
        productRepository.save(entity);

        // throw the same exception as in first case: interceptor does catch it
        //try {
        //    Thread.sleep(500);
        //} catch (InterruptedException e) {
        //    throw new RuntimeException(e);
        //}
        //throw new org.hibernate.exception.ConstraintViolationException("asd", null, null);
    }
}

I am posting a sample application below:
https://github.com/matadini/interceptor-bug

I would be grateful in advance for any comments/advice.