Implementing Exception Handling- 404 Resource Not Found with What is ... findOne(id);; if(user==null); //runtime exception; throw new UserNotFoundException("id: "+ ... We get the proper response Status: 404 Not Found when a user resource .... static class, Response.Status.Family. An enumeration representing the class of status code. ... 404 Not Found, see HTTP/1.1 documentation. ... enum type has no constant with the specified name: NullPointerException - if the argument is null ... f50e