Return HTTP 500 instead of 400 on ValidationException (#254)

[jburkal]

Fixes #254 by having ValidationExceptionMapper return a HttpProblem with INTERNAL_SERVER_ERROR instead of BAD_REQUEST.

I tried deleting the ValidationExceptionMapper in the hope that the exception would then be handled by the DefaultExceptionMapper, but that didn't work as it was instead handled by the exception mapper from Quarkus.

Also adds an additional integration-test, checking that a HTTP 500 is returned if a subclass of ValidationException is thrown, and renames ValidationExceptionsResource to fix a typo.

The branch passes both run-jvm-tests and run-native-tests, but fails when running ./mvnw verify with an exception:

java.lang.IllegalStateException: The current thread cannot be blocked: vert.x-eventloop-thread-0

However, as the master branch fails with the same exception on my machine, I assume it's unrelated to the changes made in this branch.

[jburkal]

After merging this, the documentation at https://github.com/tietoevry/quarkus-resteasy-problem/wiki#javaxvalidationvalidationexception should be updated.

[lwitkowski]

I tried deleting the ValidationExceptionMapper in the hope that the exception would then be handled by the DefaultExceptionMapper, but that didn't work as it was instead handled by the exception mapper from Quarkus.

Yeap, exceptions (re)thrown from Exception Mappers are not routed through other mappers...

Also adds an additional integration-test, checking that a HTTP 500 is returned if a subclass of ValidationException is thrown, and renames ValidationExceptionsResource to fix a typo.

Excellent.

The branch passes both run-jvm-tests and run-native-tests, but fails when running ./mvnw verify with an exception:

java.lang.IllegalStateException: The current thread cannot be blocked: vert.x-eventloop-thread-0

However, as the master branch fails with the same exception on my machine, I assume it's unrelated to the changes made in this branch.

Don't worry about it then, I'll look into it separately, maybe there are some defaults for maven profiles missing.