Question

How do I catch these invalid URLs so that I return a proper error resource?

Thanks.

Basically, I want to override the “The resource not found Page.” and instead I want to return an XML describing the error.

Answer 1

It depends a bit in which JAX-RS implementation you are using.

If you are using RESTEasy, you can create an ExceptionMapper that catches org.jboss.resteasy.spi.NotFoundException. That enables you to build and return a custom javax.ws.rs.core.Response

public class MyExceptionMapper implements ExceptionMapper<NotFoundException> {

    @Override
    public Response toResponse(NotFoundException exception) {
        return Response.status(exception.getErrorCode()).build();
    }
}

I’m a bit unsure on how to do this with Jersey, but maybe you can create an ExceptionMapper that catches com.sun.jersey.api.NotFoundException.