异常日志如下，请帮忙解决下：
Url : POST /msg
Controller : com.javen.weixin.controller.WeixinMsgController.(WeixinMsgController.java:1)
Method : index
Interceptor : com.handler.ParaValidateInterceptor.(ParaValidateInterceptor.java:1)
com.jfinal.weixin.sdk.jfinal.MsgInterceptor.(MsgInterceptor.java:1)
Parameter : signature=15f70c0b1ec87c8af9980600dd26091144b12caf timestamp=1520581870 nonce=84111626 openid=o3zK11TZFf4AnTUpSdGchgYzyvYo
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2018-03-09 15:51:10
[ERROR]-[Thread: http-nio-8080-exec-1]-[com.jfinal.core.ActionHandler.handle()]: /msg?signature=15f70c0b1ec87c8af9980600dd26091144b12caf×tamp=1520581870&nonce=84111626&openid=o3zK11TZFf4AnTUpSdGchgYzyvYo
com.jfinal.render.RenderException: java.lang.RuntimeException: File not found : /usr/local/tomcat-8080/webapps/wxapp/msg/index.html
view = baseViewPath + viewPath + methodName + ".html";
对应到你的项目中，正好是 "/wxapp/msg/index.html"
当然，你可以通过调用 renderNull() 方法告知 jfinal 不要帮你调用 render(view)