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