Wicket Websocket - Exception is logged in WicketEndpoint if the user is closing the browser

[Marc]

Hi,

I've a page with a WebSocketBehavior. Everything is OK until the user is
closing the browser or tab. An exception is logged in
org.apache.wicket.protocol.ws.javax.WicketEndpoint. 

I don't know if this kind of exception should reach the onError method.
Everything is working fine but the error message is annoying. Is it really
an error which should be logged?

I've created a quickstart attached. websockets.zip
  

Thanks!

2017-01-27 20:55:44.672 ERROR 18092 --- [nio-8080-exec-2]
o.a.w.protocol.ws.javax.WicketEndpoint   : An error occurred in web socket
connection with id : 1

java.io.IOException: java.io.IOException: Eine bestehende Verbindung wurde
softwaregesteuert
durch den Hostcomputer abgebrochen (an existing connection was forcibly
closed by the remote host)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:315)
~[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:258)
~[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:606)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:526)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:348)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:290)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:131)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:69)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:148)
[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:54)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:53)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[na:1.8.0_91]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_91]
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[tomcat-embed-core-8.5.6.jar:8.5.6]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Caused by: java.io.IOException: Eine bestehende Verbindung wurde
softwaregesteuert
durch den Hostcomputer abgebrochen
at sun.nio.ch.SocketDispatcher.write0(Native Method) ~[na:1.8.0_91]
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:51)
~[na:1.8.0_91]
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) 
~[na:1.8.0_91]
at sun.nio.ch.IOUtil.write(IOUtil.java:65) ~[na:1.8.0_91]
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
~[na:1.8.0_91]
at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:134)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:157)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1221)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.SocketWrapperBase.flushBlocking(SocketWrapperBase.java:451)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.util.net.SocketWrapperBase.flush(SocketWrapperBase.java:441)
~[tomcat-embed-core-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:97)
~[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:494)
~[tomcat-embed-websocket-8.5.6.jar:8.5.6]
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:309)
~[tomcat-embed-websocket-8.5.6.jar:8.5.6]
... 17 common frames omitted

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Re: How it Feels to Learn Javascript in 2016

[Martin Grigorov]

On Fri, Jan 27, 2017 at 2:58 AM, fzb  wrote:

> Must read article if you are thinking to start new app development in Java
> script world. Also read the comments below, how many of them had echoed the
> same concerns..
>
> https://hackernoon.com/how-it-feels-to-learn-javascript-in-
> 2016-d3a717dd577f#.gkg3u1pdp
>
> Wicket is so easy to develop and maintain.. Thank you Guys for continuing
> to
> develop & support Wicket ..
>

Thanks!
I feel the same about JavaScript. It is like a toddler - it is fun to play
with but you never know when it will start crying! :-)


>
>
> --
> View this message in context: http://apache-wicket.1842946.
> n4.nabble.com/How-it-Feels-to-Learn-Javascript-in-2016-tp4676883.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> -
> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org
> For additional commands, e-mail: users-h...@wicket.apache.org
>
>

Re: How it Feels to Learn Javascript in 2016

[Andrea Del Bene]

Go straight to slide 26 of my presentation :-D

http://events.linuxfoundation.org/sites/events/files/slides/Wicket_The_story_so_far_and_beyond.pdf

On 27/01/2017 02:58, fzb wrote:

Must read article if you are thinking to start new app development in Java
script world. Also read the comments below, how many of them had echoed the
same concerns..

https://hackernoon.com/how-it-feels-to-learn-javascript-in-2016-d3a717dd577f#.gkg3u1pdp

Wicket is so easy to develop and maintain.. Thank you Guys for continuing to
develop & support Wicket ..
   


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View this message in context: 
http://apache-wicket.1842946.n4.nabble.com/How-it-Feels-to-Learn-Javascript-in-2016-tp4676883.html
Sent from the Users forum mailing list archive at Nabble.com.

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