JAX-RS jersey ExceptionMappers用户定义的异常

Question

我是新手,试图阅读一些文档,但它不起作用,请耐心等待.

我创建了一个UserNotFoundMapper使用ExceptionMappers这样的:

public class UserNotFoundMapper implements ExceptionMapper<UserNotFoundException> {

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

}

这在我的服务中:

@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();
}

这UserNotFoundException是一个User-Defined例外.

我试过这个:

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

但是当我调用该服务时,UserDefinedExceptionMapper不会被调用.看来我可能会遗漏一些东西UserDefinedException.那么如何定义这个异常呢？

请让我知道如何定义UserNotFoundException.

Answer 1

您需要注释您的异常映射器@Provider,否则它将永远不会在JAX-RS运行时注册.

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