You're likely using a plugin that requires a newer version of Jenkins than 
1.532.x (specifically 1.577 or newer). Possibly because you manage those using 
Chef or a similar tool and completely ignore the plugins' dependencies.

On 07.04.2015, at 12:56, Andrew Langhorn 
<[email protected]> wrote:

> Hi,
> 
> We run Jenkins 1.532.1 in some environments, and have recently come across an 
> issue with SimpleBuildStep not being found as a valid class. This generates a 
> lovely stack trace (as below) and linked jobs then fail.
> 
> FATAL: jenkins/tasks/SimpleBuildStep
> java.lang.NoClassDefFoundError: jenkins/tasks/SimpleBuildStep
>       at java.lang.ClassLoader.defineClass1(Native Method)
>       at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
>       at 
> jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1138)
>       at 
> hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:695)
>       at 
> jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1309)
>       at 
> jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)
>       at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
>       at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)
>       at 
> jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:86)
>       at 
> hudson.ClassicPluginStrategy$DependencyClassLoader.findClass(ClassicPluginStrategy.java:572)
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
>       at jenkins.util.AntClassLoader.findBaseClass(AntClassLoader.java:1397)
>       at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1074)
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
>       at java.lang.Class.forName0(Native Method)
>       at java.lang.Class.forName(Class.java:191)
>       at 
> hudson.plugins.git.GitChangeSet.hasHudsonTasksMailer(GitChangeSet.java:293)
>       at 
> hudson.plugins.git.GitChangeSet.findOrCreateUser(GitChangeSet.java:271)
>       at hudson.plugins.git.GitChangeSet.getAuthor(GitChangeSet.java:326)
>       at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:414)
>       at 
> hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:729)
>       at hudson.model.Run.execute(Run.java:1709)
>       at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
>       at hudson.model.ResourceController.execute(ResourceController.java:88)
>       at hudson.model.Executor.run(Executor.java:231)
> Caused by: java.lang.ClassNotFoundException: jenkins.tasks.SimpleBuildStep
>       at 
> jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1375)
>       at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
>       at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> 
> I thought an unattended-upgrade of the JVM might have caused this, but I 
> can't see anything in the logs that would suggest that Java has been upgraded 
> recently. This used to work absolutely fine, and now it doesn't - hence we're 
> hesitant to upgrade right now to resolve this issue.
> 
> Does anyone have any ideas? :)
> 
> Let me know if you need any further details.
> 
> Thanks,
> 
> Andrew
> 
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