jfinal用config类启动工程无法用fastjson转换,而jetty:run就可以?报错

@JFinal 你好，想跟你请教个问题：

这个问题很怪, 我一直用maven的jetty:run来启动工程的, 今天想换成Config.java#main函数的这种启动方式

public static void main(String[] args) {
        JFinal.start("src/main/webapp",20001,"/lzqxl",5);
    }

public void rendFastJson(Object object) {
        //这个filter将null变为""
        System.out.println(object);
        String json = JSON.toJSONString(object, new JsonValueFilter());
        this.renderJson(json);
    }

if (lawyer == null) {
   rendFastJson(JsonResult.build(ErrCode.USERNAME_AUTH_ERROR));
   return;
}

那么问题来了, 今天我心血来潮换下工程的启动方式, 就报错了:

java.lang.ClassCastException: com.app.common.web.json.JsonResult cannot be cast to com.app.common.web.json.JsonResult
	at com.alibaba.fastjson.serializer.ASMSerializer_1_JsonResult.writeNormal(Unknown Source)
	at com.alibaba.fastjson.serializer.ASMSerializer_1_JsonResult.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:266)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:562)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:500)
	at com.app.common.web.BaseController.rendFastJson(BaseController.java:75)
	at com.app.sign.SignInController.auth(SignInController.java:81)
	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:497)