在運行java中HttpSessionListener監聽器時，運行報錯：嚴重:?StandardWrapper.Throwablecom.sun.jersey.api.container.ContainerException:?The?ResourceConfig?instance?does?not?contain?any?root?resource?classes.以下是監聽器程序：package?Listener1; import?javax.servlet.annotation.WebListener; import?javax.servlet.http.HttpSessionEvent; import?javax.servlet.http.HttpSessionListener; @WebListener public?class?HSL?implements?HttpSessionListener?{ private?int?ub; @Override public?void?sessionCreated(HttpSessionEvent?se)?{ ub++; se.getSession().getServletContext().setAttribute("ub",?ub); } @Override public?void?sessionDestroyed(HttpSessionEvent?se)?{ ub--; se.getSession().getServletContext().setAttribute("ub",?ub); } } 求大神指點哪里錯誤?。。。?！非常感謝?。。?！