Same problem here (after update to 1.5.3):
Dec 30, 2020 12:49:23 PM WARNING io.jenkins.plugins.gitlabbranchsource.GitLabWebHookAction isValidToken
Error while validating token: null
Dec 30, 2020 12:49:23 PM WARNING hudson.init.impl.InstallUncaughtExceptionHandler handleException
Caught unhandled exception with ID 7e758815-1e42-4de5-ad7d-d1d7dca1225e
java.lang.Exception: Expecting a valid secret token
at org.kohsuke.stapler.HttpResponses.error(HttpResponses.java:91)
at io.jenkins.plugins.gitlabbranchsource.GitLabSystemHookAction.doPost(GitLabSystemHookAction.java:75)
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:396)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:408)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:212)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:145)
at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:536)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:766)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:898)
at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:457)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:766)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:898)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:694)
at org.kohsuke.stapler.Stapler.service(Stapler.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:763)
at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1633)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at jenkins.telemetry.impl.UserLanguages$AcceptLanguageFilter.doFilter(UserLanguages.java:129)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
at jenkins.security.ResourceDomainFilter.doFilter(ResourceDomainFilter.java:76)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
at hudson.plugins.locale.LocaleFilter.doFilter(LocaleFilter.java:42)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at io.jenkins.plugins.gitlabbranchsource.GitLabSystemHookAction.process(GitLabSystemHookAction.java:49)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:127)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
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:119)
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:135)
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$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:51)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:36)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1609)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:561)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:578)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1612)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1582)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:516)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:556)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:135)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:773)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:905)
at java.lang.Thread.run(Thread.java:748)
Moreover - not our webhooks not working due to 401 return code from Jenkins:
Hook executed successfully but returned HTTP 401 <!DOCTYPE html><html class=""><head resURL="/static/f52db8db" data-rooturl="" data-resurl="/static/f52db8db" data-extensions-available="true" data-unit-test="false" data-imagesurl="/static/f52db8db/images" data-crumb-header="Jenkins-Crumb" data-crumb-value="f29ef53118bb44cbe643d9afd701c257a96cde0a531dd23f232c429a1db78ebc"> <title>Jenkins [Jenkins]</title><link rel="stylesheet" href="/static/f52db8db/jsbundles/base-styles-v2.css" type="text/css"><link rel="stylesheet" href="/static/f52db8db/css/color.css" type="text/css"><link rel="stylesheet" href="/static/f52db8db/css/responsive-grid.css" type="text/css"><link rel="shortcut icon" href="/static/f52db8db/favicon.ico" type="image/vnd.microsoft.icon"><link color="black" rel="mask-icon" href="/images/mask-icon.svg"><script src="/static/f52db8db/scripts/prototype.js" type="text/javascript"></script><script src="/static/f52db8db/scripts/behavior.js" type="text/javascript"></script><script src='/adjuncts/f52db8db/org/kohsuke/stapler/bind.js' type='text/javascript'></script><script src="/static/f52db8db/scripts/yui/yahoo/yahoo-min.js"></script><script src="/static/f52db8db/scripts/yui/dom/dom-min.js"></script><script src="/static/f52db8db/scripts/yui/event/event-min.js"></script><script src="/static/f52db8db/scripts/yui/animation/animation-min.js"></script><script src="/static/f52db8db/scripts/yui/dragdrop/dragdrop-min.js"></script><script src="/static/f52db8db/scripts/yui/container/container-min.js"></script><script src="/static/f52db8db/scripts/yui/connection/connection-min.js"></script><script src="/static/f52db8db/scripts/yui/datasource/datasource-min.js"></script><script src="/static/f52db8db/scripts/yui/autocomplete/autocomplete-min.js"></script><script src="/static/f52db8db/scripts/yui/menu/menu-min.js"></script><script src="/static/f52db8db/scripts/yui/element/element-min.js"></script><script src="/static/f52db8db/scripts/yui/button/button-min.js"></script><script src="/static/f52db8db/scripts/yui/storage/storage-min.js"></script><script src="/static/f52db8db/scripts/polyfills.js" type="text/javascript"></script><script src="/static/f52db8db/scripts/hudson-behavior.js" type="text/javascript"></script><script src="/static/f52db8db/scripts/sortable.js" type="text/javascript"></script><link rel="stylesheet" href="/static/f52db8db/scripts/yui/container/assets/container.css" type="text/css"><link rel="stylesheet" href="/static/f52db8db/scripts/yui/container/assets/skins/sam/container.css" type="text/css"><link rel="stylesheet" href="/static/f52db8db/scripts/yui/menu/assets/skins/sam/menu.css" type="text/css"><link rel="stylesheet" href="/static/f52db8db/jsbundles/ui-refresh-overrides.css" type="text/css"><meta name="ROBOTS" content="INDEX,NOFOLLOW"><meta name="viewport" content="width=device-width, initial-scale=1"><script src="/adjuncts/f52db8db/org/kohsuke/stapler/jquery/jquery.full.js" type="text/javascript"></script><script>var Q=jQuery.noConflict()</script><script src="/static/f52db8db/jsbundles/vendors.js" type="text/javascript"></script><script src="/static/f52db8db/jsbundles/page-init.js" type="text/javascript"></script></head><body data-model-type="hudson.model.Hudson" id="jenkins" class="yui-skin-sam one-column jenkins-2.263.1" data-version="2.263.1"><a href="#skip2content" class="skiplink">Skip to content</a><div id="page-head"><header id="header" class="page-header"><div class="page-header__brand"><div class="logo"><a id="jenkins-home-link" href="/"><img src="/static/f52db8db/images/jenkins-header-logo-v2.svg" alt="[Jenkins]" id="jenkins-head-icon"><img src="/static/f52db8db/images/title.png" alt="Jenkins" width="139" id="jenkins-name-icon" height="34"></a></div><a href="/" class="page-header__brand-link"><img src="/static/f52db8db/images/jenkins-header-logo-v2.svg" alt="[Jenkins]" class="page-header__brand-image"><span class="page-header__brand-name">Jenkins</span></a></div><div class="searchbox hidden-xs"><form role="search" method="get" name="search" action="/search/" style="position:relative;" class="no-json"><div id="search-box-sizer"></div><div id="searchform"><input role="searchbox" name="q" placeholder="search" id="search-box" class="main-search__input"><span class="main-search__icon-leading"><svg viewBox="0 0 24 24" tooltip="" focusable="false" class="svg-icon "><use href="/static/f52db8db/images/material-icons/svg-sprite-action-symbol.svg#ic_search_24px"></use></svg></span><a href="https:
Downgraded to 1.5.1 and waiting for update
Same problem here (after update to 1.5.3):
Moreover - not our webhooks not working due to 401 return code from Jenkins:
Downgraded to 1.5.1 and waiting for update