ExceptionMapper not catching WebApplicationException with entity

I'm on Jersey 2.26

I have my own exception class that extends javax.ws.rs.WebApplicationException. It seems that when this custom exception sets an entity in the javax.ws.rs.core.Response, an ExceptionMapper cannot be used.

If I null out the entity, my ExceptionMapper behaves as expected. I had my ExceptionMapper catching Throwable/RuntimeException, so it took a day of googling to determine why this was happening.

If this is the intended result, may I suggest that the ExceptionMapper interface be documented with this gotcha.

Related issues.
https://stackoverflow.com/questions/33732408/exceptionmapper-not-working-as-expected
https://stackoverflow.com/questions/29414041/exceptionmapper-for-webapplicationexceptions-thrown-with-entity

Start by reproducing the Jersey 2.26 case with a custom javax.ws.rs.WebApplicationException containing a Response entity and an ExceptionMapper for Throwable or RuntimeException. Compare it with the same exception when the entity is null; done means the behavior is corrected or the ExceptionMapper interface documents this behavior clearly.

Written by the indexing model from the issue text.