JAX-RS jersey ExceptionMappers User-Defined Exception

Question

I am new to this, trying to achieve reading some docs but its not working, please bear with me.

I have created a UserNotFoundMapper using ExceptionMappers like this:

public class UserNotFoundMapper implements ExceptionMapper<UserNotFoundException> {  @Override public Response toResponse(UserNotFoundException ex) {     return Response.status(404).entity(ex.getMessage()).type("text/plain").build(); }  } 

This in my service:

@GET @Path("/user") public Response getUser(@QueryParam("id") String id) throws UserNotFoundException{     //Some user validation code with DB hit, if not found then     throw new UserNotFoundException(); } 

The UserNotFoundException is an User-Defined Exception.

I tried this:

public class UserNotFoundException extends Exception {        //SOME block of code  } 

But when I invoke the service, the UserDefinedExceptionMapper is not getting invoked. It seems I might be missing something in the UserDefinedException. How to define this exception then?

Please let me know how to define the UserNotFoundException.

Answer 1

You need to annotate your exception mapper with @Provider, otherwise it will never get registered with the JAX-RS runtime.

@Provider public class UserNotFoundMapper implements         ExceptionMapper<UserNotFoundException> {     @Override     public Response toResponse(UserNotFoundException ex) {         return Response.status(404).entity(ex.getMessage()).type("text/plain")                 .build();     } }