maven 项目引入jfinal 2.2依赖和jetty 8.1.8，然后配置web.xml，启动application，main class 是core.JFinal，然后报错
Exception in thread "main" java.lang.RuntimeException: WEB-INF directory not found. at com.jfinal.server.ServerFactory.detectWebAppDir(ServerFactory.java:75) at com.jfinal.server.ServerFactory.getServer(ServerFactory.java:64) at com.jfinal.core.JFinal.main(JFinal.java:167) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
项目：JFinal
