Relatime Collaborative Editor 500 (Internal Server Error) - netflux

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1

I am trying to get the Realtime Collaborative Editor working.
I see the message “Connecting to the collaborative session. Please wait…”
But in the network tab I get a status 500 for wss://mywiki/websocket/xwiki/netflux
I see the following error in the log. Not sure if this is related, but I will try to fix that.
xWiki Version: 13.10.2

2022-01-02 11:02:41,397 [http-nio-8080-exec-78 - http://wiki/webjars/wiki%3Axwiki/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0] ERROR ebJarsResourceReferenceHandler - Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2] 
org.xwiki.resource.ResourceReferenceHandlerException: Failed to read resource [font-awesome/4.7.0/fonts/fontawesome-webfont.woff2]
	at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:184)
	at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.handle(AbstractServletResourceReferenceHandler.java:86)
	at org.xwiki.resource.internal.DefaultResourceReferenceHandlerChain.handleNext(DefaultResourceReferenceHandlerChain.java:79)
	at org.xwiki.resource.internal.AbstractResourceReferenceHandlerManager.handle(AbstractResourceReferenceHandlerManager.java:82)
	at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.handleResourceReference(ResourceReferenceHandlerServlet.java:159)
	at org.xwiki.resource.servlet.ResourceReferenceHandlerServlet.service(ResourceReferenceHandlerServlet.java:87)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:63)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:711)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:353)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:313)
	at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:145)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe
	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:353)
	at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:783)
	at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:688)
	at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:388)
	at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:366)
	at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1310)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:978)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1282)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:953)
	at org.xwiki.resource.servlet.AbstractServletResourceReferenceHandler.serveResource(AbstractServletResourceReferenceHandler.java:181)
	... 35 common frames omitted
Caused by: java.io.IOException: Broken pipe
	at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
	at java.base/sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
	at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:113)
	at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:79)
	at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:50)
	at java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:462)
	at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:135)
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1373)
	at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:766)
	at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:586)
	at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:530)
	at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:547)
	at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:112)
	at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:194)
	at org.apache.coyote.Response.doWrite(Response.java:615)
	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:340)
	... 45 common frames omitted
2

Interesting. After deinstalling some of the dependencies and reinstalling them I still have the same 500 response, but no error in the logs. Only two warnings:


2022-01-02 11:50:41,980 [http-nio-8080-exec-30 - http://wiki/bin/jsx/XWiki/InplaceEditing?language=en&docVersion=5.1] WARN  c.x.x.w.JsxAction              - Failed to send SX content: [java.io.IOException: Broken pipe] 
2022-01-02 11:50:42,053 [http-nio-8080-exec-14 - http://wiki/bin/jsx/AnnotationCode/Script?language=en&docVersion=3.1] WARN  c.x.x.w.JsxAction              - Failed to send SX content: [java.io.IOException: Broken pipe]

UPDATE: No, after a restart of the container, the original StackTraces are back

3

I have checked and the URL in the StackTrace is actually correct. I can download the file fontawesome-webfont.woff2 in a browser from that URL. Interesting enough that the URL is in http schema although I am using https that is kind of weird, still should work so there must be some other issue with the code.

4

I tried the URL of the websocket that gets an InternalServerError (500) in the browser with Firebase and there seems to be no problem. I can open the connection an get a message:

[
    0,
    "",
    "IDENT",
    "bfba9209338bdd35376bd88047bd7b51"
]

But then I see an authorization error (of course)

2022-01-02 16:04:38,196 [http-nio-8080-exec-50 - http://wiki.ebanking.iss.cpbs.at//websocket/xwiki/netflux] ERROR x.x.u.i.x.XWikiAuthServiceImpl - Failed to authenticate 
java.lang.NullPointerException: null
	at org.securityfilter.filter.SecurityRequestWrapper.getUserPrincipal(SecurityRequestWrapper.java:208)
	at com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.processLogin(MyFormAuthenticator.java:147)
	at com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl.checkAuth(XWikiAuthServiceImpl.java:239)

But it means that the websocket should work, no?

5

The broken pipe exception is not related to the WebSocket connection. It simply means that the browser closed the connection (because you navigated to a different page) while the server was trying to write the response. See for instance Loading... .

I’ll check the NullPointerException during authentication and get back to you.

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