Question

I am trying to determine if it is possible to setup an interceptor like solution on a REST resource such that if an exception is thrown I can log the exception and change the response returned. I basically don’t want to wrap all my REST resources with try/catch blocks. If a REST resource was managed I would just use an @Interceptor on all of my calls but since it is not managed that seems to be out of the question.

Answer 1

You can use an implementation javax.ws.rs.ext.ExceptionMapper. Let’s suppose that your code might throw a YourFancyException from the resources. Then you can use the following mapper:

@Provider
public class YourFancyExceptionMapper 
                implements ExceptionMapper <YourFancyException> {
    @Override
    public Response toResponse(YourFancyException exception) {
        return Response.status(Response.Status.BAD_REQUEST)
                        .entity(exception.getMessage()).build();
    }
}

Don’t forget to annotate the mapper with @Provider and to make your resources methods to throw YourFancyException.