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https://issues.jenkins-ci.org/browse/JENKINS-3896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=160308#comment-160308
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Marc Günther commented on JENKINS-3896:
---------------------------------------
Fix available in JENKINS-8043
> hudson loses swarm slave information when refreshed from disk.
> --------------------------------------------------------------
>
> Key: JENKINS-3896
> URL: https://issues.jenkins-ci.org/browse/JENKINS-3896
> Project: Jenkins
> Issue Type: Bug
> Components: swarm
> Affects Versions: current
> Environment: Platform: All, OS: All
> Reporter: aravindg
>
> Hi,
> I am using the latest hudson war file and the 1.0 swarm client. I am running
> these swarm clients from the local machine with a different fsroot than hudson
> home. It appears that hudson loses all information/context about the
> connected
> swarm clients/slaves. I have verified that before hudson is refreshed from
> disk, it can see and configure the swarm clients etc. Once its refreshed, it
> no
> longer appears to be able to find any details about the swarm slaves.
> Clicking
> on the swarm slaves throws this null pointer exception
> Problem accessing /hudson/computer/blah/. Reason:
> INTERNAL_SERVER_ERROR
> Caused by:
> java.lang.NullPointerException
> at hudson.model.Hudson.getComputer(Hudson.java:1220)
> at hudson.model.ComputerSet.getDynamic(ComputerSet.java:178)
> at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:176)
> at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:92)
> at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:307)
> at org.kohsuke.stapler.Stapler.invoke(Stapler.java:486)
> at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:143)
> at
> org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
> at org.kohsuke.stapler.Stapler.invoke(Stapler.java:486)
> at org.kohsuke.stapler.Stapler.invoke(Stapler.java:404)
> at org.kohsuke.stapler.Stapler.service(Stapler.java:117)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:91)
> at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
> at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:58)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
> at
> hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
> at
> hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
> at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:155)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
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