Many thanx, 
the Error in the Manage Jenkins > System log 
is gone, log there is clean now, but the error is still raised when i'm in 
the log out page. I guess it is an other problem then, I will open a new 
post, anyway I attach here also, in case it is related: 

Stack trace

java.lang.NullPointerException
        at java.util.TreeMap.put(TreeMap.java:556)
        at java.util.TreeSet.add(TreeSet.java:255)
        at jenkins.model.Jenkins.getUnprotectedRootActions(Jenkins.java:3876)
        at jenkins.model.Jenkins.getTarget(Jenkins.java:3852)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:674)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
        at 
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:123)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        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: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:76)
        at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:558)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
        at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
        at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
        at 
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
        at 
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
        at java.lang.Thread.run(Thread.java:745)






Il giorno mercoledì 16 marzo 2016 14:47:13 UTC+1, Victor Martinez ha 
scritto:
>
> Hi,
>
>
>  AFAIK java.lang.NoClassDefFoundError: 
> com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescripton means 
> you are missing some jars/plugins so you need to install the 
> https://wiki.jenkins-ci.org/display/JENKINS/CloudBees+Folders+Plugin plugin
>
>
>  Give a go and see whether it works 
>
>
> Cheers
>
>
> On Wednesday, 16 March 2016 13:14:30 UTC, cardio palma wrote:
>>
>> Dear everybody, 
>> hoping I'm not asking in the wrong channel, 
>> I'm facing the following issue and I'm unable to find more information 
>> around the web. 
>>
>> This error is raised when I logout from Jenkins, and in general always when 
>> the login page is loaded: 
>>
>> Mar 16, 2016 9:47:14 AM WARNING hudson.ExtensionFinder$Sezpoz scout
>>
>> Failed to scout 
>> com.cloudbees.hudson.plugins.folder.properties.AuthorizationMatrixProperty$DescriptorImpl
>> java.lang.InstantiationException: java.lang.NoClassDefFoundError: 
>> com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescriptor
>>      at net.java.sezpoz.IndexItem.element(IndexItem.java:146)
>>      at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:667)
>>      at 
>> hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:382)
>>      at hudson.ExtensionList.load(ExtensionList.java:349)
>>      at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)
>>      at hudson.ExtensionList.iterator(ExtensionList.java:156)
>>      at 
>> hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:381)
>>      at hudson.ExtensionList.load(ExtensionList.java:349)
>>      at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)
>>      at hudson.ExtensionList.get(ExtensionList.java:171)
>>      at 
>> hudson.PluginManager$PluginUpdateMonitor.getInstance(PluginManager.java:1261)
>>      at hudson.maven.PluginImpl.init(PluginImpl.java:58)
>>      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>      at 
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>>      at 
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>      at java.lang.reflect.Method.invoke(Method.java:606)
>>      at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:106)
>>      at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:176)
>>      at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
>>      at jenkins.model.Jenkins$7.runTask(Jenkins.java:905)
>>      at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
>>      at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
>>      at 
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>>      at 
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>>      at java.lang.Thread.run(Thread.java:745)
>> Caused by: java.lang.NoClassDefFoundError: 
>> com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescriptor
>>      at java.lang.ClassLoader.defineClass1(Native Method)
>>      at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
>>      at 
>> jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1139)
>>      at 
>> hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:801)
>>      at 
>> jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1310)
>>      at 
>> jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1366)
>>      at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
>>      at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
>>      at 
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>      at java.lang.reflect.Method.invoke(Method.java:606)
>>      at 
>> jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)
>>      at 
>> jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:86)
>>      at 
>> hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1123)
>>      at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
>>      at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
>>      at net.java.sezpoz.IndexItem.element(IndexItem.java:134)
>>      ... 24 more
>> Caused by: java.lang.ClassNotFoundException: 
>> com.cloudbees.hudson.plugins.folder.AbstractFolderPropertyDescriptor
>>      at 
>> jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1376)
>>      at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
>>      at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
>>      at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
>>      ... 40 more
>>
>>
>> I've checked and the plugin *cloudbees* is not installed in my Jenkins 
>> instance, this is confusing me. 
>>
>> I've updated all the installed plugin and then upgraded Jenkins to the 
>> lastest version: 
>> http://updates.jenkins-ci.org/download/war/*1.642.2*/jenkins.war
>>
>> Currently I've no Idea on how to proceed
>>
>> Many thanks for any hint
>>
>>

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