ExceptionMapper in Jersey throws mapMappableContainerException

Question

I created one Rest service and wanted to implement exception handling, but it throws a mapMappableContainerException while I try to start the services. You can find my code here.

MyService:

@GET
@Produces({MediaType.APPLICATION_JSON})
@Path("add")
public Response addJobSeeker() throws MyCustomException{

    throw new MyCustomException("My Exception");    

}

My exception class.

@Provider
public class MyExceptionMapper extends Exception implements ExceptionMapper<MyCustomException>{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public MyExceptionMapper(String str){
        super(str);
    }
    @Override
    public Response toResponse(MyCustomException exception) {
        System.out.println("In my exception mapper -- "+exception.getMessage());
        Success sc = new Success(404, "Hello", "I am mukesh");
        return Response.status(404).entity(sc).type(MediaType.APPLICATION_JSON).build();        
    }

}

Mycustomclass

public class MyCustomException extends Exception {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public MyCustomException(String str){
        super(str);
    }