Question Resource with null check.

QuestionResource.java

@Path("questions/")
public class QuestionResource {
  
  @GET
  @Path("{id}")
  @Produces("application/json")
  Response getQuestion(@PathParam("id") String questionId) {
    QuestionDto question = questionService.getQuestionById(questionId);
    if (question == null) {
            return Response.status(NOT_FOUND).build();
    }
    return Response.status(OK).entity(question).build();
  }
  
}