click "bell notification" on top - error occures
Asked by Markus Holzer:

Dear community,

I have a problem again!

There is this fantastic feature - "bell notification" on top of every confluece site. But since some couple of days (I suppose the day I made an update to v 6.7.1 3 weeks ago), every user, ervery browser gets an error by clicking the notification-bell.

Server-Side there is no error when cklicking in any logs/\*.log

What makes me perpley, are the messages of the browser-developer-tools. Each load of a Site shows a lot of strange messages.

Some of those are:

1) SCRIPT12030: SCRIPT12030: WebSocket Error: Network Error 12030, Die Serververbindung wurde aufgrund eines Fehlers beendet

2) especially this one (german): HTTP500: SERVERFEHLER: Es ist ein unerwarteter Zustand aufgetreten, sodass der Server die Anforderung nicht erf?llen kann. GET - <https://wiki.XXXXX.com/plugins/servlet/notifications-miniview>

By clicking the notificaton-bell the error says something like:

### *Cause* {#toc-hId-1623626133}

*java.lang.RuntimeException: java.util.concurrent.TimeoutException*   
*at com.google.common.base.Throwables.propagate(Throwables.java:160)*

*caused by: java.util.concurrent.TimeoutException*   
*at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.tryExecuteUnderLock(LockedTaskExecutor.java:66)*

#### *Stack Trace:\[hide\]* {#toc-hId--1125044333}

```
java.lang.RuntimeException: java.util.concurrent.TimeoutException	at com.google.common.base.Throwables.propagate(Throwables.java:160)	at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.executeUnderLock(LockedTaskExecutor.java:132)	at com.atlassian.mywork.host.service.LocalRegistrationServiceImpl.getLastModified(LocalRegistrationServiceImpl.java:205)	at com.atlassian.mywork.host.service.LocalRegistrationServiceImpl.getCacheValue(LocalRegistrationServiceImpl.java:244)	at com.atlassian.mywork.host.servlet.ServletRenderer.renderWithAnchor(ServletRenderer.java:79)	at com.atlassian.mywork.host.servlet.ServletRenderer.renderWithAnchor(ServletRenderer.java:46)	at com.atlassian.mywork.host.servlet.NotificationsMiniviewServlet.doGet(NotificationsMiniviewServlet.java:23)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at com.atlassian.plugin.servlet.DelegatingPluginServlet.service(DelegatingPluginServlet.java:37)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at com.atlassian.plugin.servlet.ServletModuleContainerServlet.service(ServletModuleContainerServlet.java:45)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at com.atlassian.confluence.web.filter.DebugFilter.doFilter(DebugFilter.java:46)	at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:39)	at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58)	at com.atlassian.confluence.plugins.baseurl.IncludeResourcesFilter.doFilter(IncludeResourcesFilter.java:52). (20.000 character limit!!)
.
.
.

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)	at org.apache.catalina.valves.StuckThreadDetectionValve.invoke(StuckThreadDetectionValve.java:206)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:748)Caused by: java.util.concurrent.TimeoutException	at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.tryExecuteUnderLock(LockedTaskExecutor.java:66)	at com.atlassian.mywork.host.util.concurrent.LockedTaskExecutor.executeUnderLock(LockedTaskExecutor.java:116)	... 288 more
```

Can anybody help?

After hours of reading and hours of different approaches to solve that problem, I give up!!

some of the approaches:

.) reindexing

.) index complete new after node restarte

.) permissions check

.) file structure check

.) many more...

HOPE anybody can help!

THANKS,

markus


Answers:
author: R. Fuerst
body: Hi Markus,

I believe you're experiencing a known bug in Confluence, described in the ticket below:

* [CONFSERVER-55314](https://jira.atlassian.com/browse/CONFSERVER-55134)

Please comment on the bug with how this is affecting your team and see if the workaround will work for you.

Hope it helps!  
Best,

Rachel