springMVC 内嵌jetty时，出现了NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet；
添加了
1.jetty-6.1.25.jar
2.jetty-servlet-9.4.8.v20171121.jar
3.jetty-util-6.1.25.jar
4.jsp-2.1-glassfish-2.1.v20100127.jar
5.jsp-2.1-jetty-6.1.26.jar
6.servlet-api-3.1.jar