Golang-为什么在ServeHTTP函数中发生此错误：反射：调用reflect.Value.Call对零值

Question

My code and error message are in here: https://gist.github.com/WithGJR/a700e5d5bd35b5c8eef2

Could anyone explain for me why this error occured and how to fix it? Thanks.

Answer 1

Because value.MethodByName(info.controllerMethodName) probably returns an invalid method, you should check method.IsValid().

When something like this happens you start adding a bunch of log.Printlns to see what's happening, well until a proper debugger is introduced.

//edit

router.Get("/", controllers.IndexController{}, "Index")

You're passing a value, func (this *IndexController) Index() is defined on the pointer so your MethodByName isn't working right, change your router.Get to :

router.Get("/", &controllers.IndexController{}, "Index")