On 10. June 2020 at 04:52:38, 陌路人 (h5ru@qq.com) wrote:

Hi,

Firstly thank you for your time.

Sometimes, logback does not print exception's cause, I can't use the log to fix bug, as followings:

2020-06-09 16:54:32,393 ERROR [task-executor-27] [SimpleDispatcher.java:203] Exception occurred during dispatch web socket frame for uri[/ws/partydungeon/move] by uid[‪6493203‬].

java.lang.reflect.InvocationTargetException: null

at sun.reflect.GeneratedMethodAccessor100.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.mitu.game.dispatcher.SimpleDispatcher$EventRunnable.doWebSocketMessage(SimpleDispatcher.java:187)

at com.mitu.game.dispatcher.SimpleDispatcher$EventRunnable.run(SimpleDispatcher.java:106)

at com.mitu.game.wrapper.ThreadPoolTaskExecutorEx$SafeRunnable.run(ThreadPoolTaskExecutorEx.java:74)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.NullPointerException: null

2020-06-09 16:54:32,405 INFO [nioEventLoopGroup-3-4] [SimpleLoggingHandler.java:35] IN {uid=‪5589867‬, forward=183.200.25.192, 183.200.25.192:24172, type=websocket, uri=/ws/user/bind, ts=‪1591692869‬} /10.0.0.70:34948 10

And the code is like:

    private void doWebSocketMessage(Event event) {

            String uri = "some uri";

            String uid = "some id";

            try {

                Object ret = action.method.invoke(action.instance, event.getData(), new Object[]{event});

            } catch (Exception ex) {

                logger.error(String.format("Exception occurred during dispatch web socket frame for uri[%s] by uid[%s].", uri, uid), ex);

            }

        }

I tried to look for answers by google and bing, but failed, and I tried to reproduce this problem, failed too, the cause can be printed, and it likes:

java.lang.reflect.InvocationTargetException: null

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.mitu.game.Application.main(Application.java:54)

Caused by: java.lang.NullPointerException: null

at com.mitu.game.Application$T.f(Application.java:42)

... 5 common frames omitted 

the difference is NativeMethodAccessorImpl vs GeneratedMethodAccessor100, is it matter? I steped into the logback code, maybe the target of the exception is null, but I do not know the reason:(

Thank you again, for your patient, and sorry for my poor english:(

BR,

Mike Yu

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