POJOMappingFeature for HTTP errors? - google-app-engine

Question

I have com.sun.jersey.api.json.POJOMappingFeature set to true and it works fine for HTTP 200 responses.
However, when my application returns an error, it shows text/html response with error headline instead.
Even if I create my custom exception (in ContainerRequestFilter) like this:
throw new WebApplicationException(
Response.status(Response.Status.FORBIDDEN)
.type(MediaType.APPLICATION_JSON)
.build()
);
It still shows generic text/html 403 error.

Answer 1

You should try the ExceptionMapper from Jersey:
First, your Custom Exception:
public class UnauthorizedException extends RuntimeException {
public UnauthorizedException() {}
}
Then, your Entity, you want to send back:
#XmlRootElement
public class ErrorMessage{
#XmlElement
private String message;
public ErrorMessage(String message){
this.message = message;
}
}
And finally, the Magic kicks in :)
#Provider
public class UnauthorizedExceptionMapper implements ExceptionMapper<UnauthorizedException>{
#Override
public Response toResponse(UnauthorizedException exception) {
return Response.status(Response.Status.UNAUTHORIZED)
.entity(new ErrorMessage("Not Authorized"))
.build();
}
}
Now, a JSON-Entity should be returned when you
throw new UnauthorizedException();
Regards