Hi

After a system change to our Jenkins master,  *Manage Jenkins > Manage
Plugins > Check now* gives an exception (see below).

What could be causing this?

Best regards

David

Caught exception evaluating: it.shouldDisplay() in /jenkins/log/.
Reason: java.lang.ClassCastException:
hudson.node_monitors.ResponseTimeMonitor cannot be cast to
hudson.model.UpdateSite
java.lang.ClassCastException: hudson.node_monitors.ResponseTimeMonitor
cannot be cast to hudson.model.UpdateSite
        at hudson.model.UpdateCenter.getCoreSource(UpdateCenter.java:586)
        at 
hudson.model.UpdateCenter$CoreUpdateMonitor.getData(UpdateCenter.java:1003)
        at 
hudson.model.UpdateCenter$CoreUpdateMonitor.isActivated(UpdateCenter.java:998)
        at 
jenkins.model.Jenkins.lambda$getActiveAdministrativeMonitors$0(Jenkins.java:2124)
        at 
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174)
        at java.util.Iterator.forEachRemaining(Iterator.java:116)
        at 
java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
        at 
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
        at 
java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at 
java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
        at 
jenkins.model.Jenkins.getActiveAdministrativeMonitors(Jenkins.java:2124)
        at 
jenkins.management.AdministrativeMonitorsDecorator.getActiveAdministrativeMonitors(AdministrativeMonitorsDecorator.java:81)
        at 
jenkins.management.AdministrativeMonitorsDecorator.getActiveAdministrativeMonitorsCount(AdministrativeMonitorsDecorator.java:76)
        at 
jenkins.management.AdministrativeMonitorsDecorator.shouldDisplay(AdministrativeMonitorsDecorator.java:139)
        at sun.reflect.GeneratedMethodAccessor315.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:258)
        at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
        at 
org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
        at 
org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
        at 
org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
        at 
org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
        at 
hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:74)
        at 
org.apache.commons.jelly.expression.ExpressionSupport.evaluateRecurse(ExpressionSupport.java:61)
        at 
org.apache.commons.jelly.expression.ExpressionSupport.evaluateAsBoolean(ExpressionSupport.java:71)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:97)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
        at 
org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)
        at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:147)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)
        at 
org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:98)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:98)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at 
org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
        at 
org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)
        at 
org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)
        at 
org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)
        at 
org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:63)
        at 
org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:53)
        at 
org.kohsuke.stapler.jelly.JellyClassTearOff.serveIndexJelly(JellyClassTearOff.java:112)
        at 
org.kohsuke.stapler.jelly.JellyFacet.handleIndexRequest(JellyFacet.java:140)
        at 
org.kohsuke.stapler.IndexViewDispatcher.dispatch(IndexViewDispatcher.java:30)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:734)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:864)
        at org.kohsuke.stapler.MetaClass$3.doDispatch(MetaClass.java:209)
        at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:734)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:864)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:668)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:860)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
        at 
org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:225)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at 
io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:61)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at 
com.cloudbees.jenkins.support.slowrequest.SlowRequestFilter.doFilter(SlowRequestFilter.java:37)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at 
io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at 
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:239)
        at 
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:215)
        at 
net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:88)
        at 
org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:114)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
        at 
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:105)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
        at 
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
        at 
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
        at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:530)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:347)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:256)
        at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
        at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:382)
        at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

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