Custom ExceptionMapper mapper is not catching swagger validation

[ktalebian]

I have a custom exception mapper:

@Provider
public class AppExceptionMapper implements ExceptionMapper<Exception> {
    @Context
    private HttpServletRequest httpRequest;
  
    @Override
    public Response toResponse(final Exception e) {
        if (e instanceof ValidationException) {
           // return a custom Response here
        } 
        // other mappers
    }
}

And have it registered as environment.jersey().register(new AppExceptionMapper());

This would work when in my code I do throw new ValidationException(...). However, I have swagger annotations for validating the request:

@POST
public void doSomething(@Valid @NotNull final SomeObject object);

When this validation fails, my custom exception mapper does not catch it, and the generic exception is returned. I put a breakpoint inside ValidationException, and swagger does throw this exception, but for some reason, my exception mapper is not catching it.

How come?

[reneploetz]

(These are likely not swagger annotations, but javax.validation / hibernate-validator annotations.)

As you also commented in #2380 and eclipse-ee4j/jersey#3425 I would assume you tried to register this exact class in Jersey.

Did you try the approach stated in the upstream ticket you commented on?

environment.jersey().register(new AbstractBinder() {
    @Override
    protected void configure() {
        bind(CustomExceptionMapper.class).to(ExceptionMapper.class).in(Singleton.class);
    }
});

Note that the referenced CustomExceptionMapperclass must implement javax.ws.rs.ext.ExceptionMapper<ValidationException> and therefore use javax.validation.ValidationException as parameter to toResponse to override the default jersey implementation (and Dropwizards override itself unless you already disabled that with registerDefaultExceptionMappers=false). This means you cannot use a generic exception mapper for the whole application.

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