Hello,

When I'm saving the Jenkins configuration on a Multibranch Pipeline I get a 
stacktrace error after the update to Jenkins 2.138.1.

Is this a known issue? And is there a workaround of this problem?

java.lang.ClassCastException: 
org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject cannot be 
cast to hudson.model.AbstractProject
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.getPollingNodeListRequiredWS(AbstractTrigger.java:381)
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.getPollingNodeList(AbstractTrigger.java:345)
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.getPollingNodesWithExecutors(AbstractTrigger.java:329)
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.getPollingNode(AbstractTrigger.java:309)
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:84)
        at 
org.jenkinsci.lib.xtrigger.AbstractTrigger.start(AbstractTrigger.java:29)
        at 
com.cloudbees.hudson.plugins.folder.computed.ComputedFolder.submit(ComputedFolder.java:458)
        at jenkins.branch.MultiBranchProject.submit(MultiBranchProject.java:884)
        at 
com.cloudbees.hudson.plugins.folder.AbstractFolder.doConfigSubmit(AbstractFolder.java:1353)
        at 
com.cloudbees.hudson.plugins.folder.computed.ComputedFolder.doConfigSubmit(ComputedFolder.java:402)
        at java.lang.invoke.MethodHandle.invokeWithArguments(Unknown Source)
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
        at 
org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:77)
        at 
org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
        at 
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
        at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
        at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:734)
Caused: javax.servlet.ServletException
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:784)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:864)
        at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
        at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:734)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:864)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:668)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
        at hudson.plugins.locale.LocaleFilter.doFilter(LocaleFilter.java:42)
        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:1642)
        at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        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:1642)
        at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:531)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at 
org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:291)
        at 
org.eclipse.jetty.io.ssl.SslConnection$3.succeeded(SslConnection.java:151)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at 
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at 
winstone.BoundedExecutorService.lambda$scheduleNext$0(BoundedExecutorService.java:80)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)


Kind regards,

Roel de Wildt
Software Engineer

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