No Idea why : The ResourceConfig instance does not contain any root resource classes [duplicate]
问题 This question already has answers here : The ResourceConfig instance does not contain any root resource classes (25 answers) Closed last year . I'm new to jersey and web services and I'm try to run a simple RESTful web service. I followed http://www.mkyong.com/webservices/jax-rs/jersey-hello-world-example/ but my project doesn't use maven and I download the jersey.1.17.1.jar and include it to my project path. When I want to call the service on http://localhost:8080/sycotext/rest/service