> Migrating to Jenkins 1.462 : Bad version number in .class file (unable to load class com.google.common.collect.ImmutableSet)
> --------------------------------------------------------------------------- -------------------------------------------------

>                 Key: JENKINS-13659
>                 URL: https://issues.jenkins-ci.org/browse/JENKINS-13659
>             Project: Jenkins
>          Issue Type: Bug
>          Components: core, jclouds
>    Affects Versions: current
>         Environment: Tomcat 6.0.33
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03)
> Java HotSpot(TM) Server VM (build 1.5.0_22-b03, mixed mode)
> Solaris 2.10
>            Reporter: Laurent Schoelens
>            Assignee: olamy
>            Priority: Blocker
>              Labels: exception, jenkins
>             Fix For: current

> Can't start Jenkins 1.462 because of the following error on Java 5.
> SEVERE: Failed to initialize Jenkins
> java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class com.google.common.collect.ImmutableSet)
>         at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassL oader.java:2822)
>         at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.ja va:1159)
>         at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja va:1647)
>         at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.ja va:1526)
>         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
>         at hudson.security.PermissionScope.<init>(PermissionScope.java:70)
>         at hudson.security.PermissionScope.<clinit>(PermissionScope.java:95)
>         at hudson.security.Permission.<init>(Permission.java:179)
>         at hudson.security.Permission.<clinit>(Permission.java:292)
>         at jenkins.model.Jenkins.<clinit>(Jenkins.java:3817)
>         at hudson.WebAppMain.installLogger(WebAppMain.java:256)
>         at hudson.WebAppMain.contextInitialized(WebAppMain.java:107)
>         at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java :4206)
>         at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
>         at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java: 799)
>         at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
>         at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
>         at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:675 )
>         at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:60 1)
>         at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
>         at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
>         at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
>         at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSuppo rt.java:142)
>         at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
>         at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
>         at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
>         at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
>         at org.apache.catalina.core.StandardService.start(StandardService.java:525)
>         at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
>         at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:3 9)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:592)
>         at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
>         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
> May 2, 2012 12:30:44 PM org.apache.catalina.core.StandardContext start
> SEVERE: Error listenerStart
> May 2, 2012 12:30:44 PM org.apache.catalina.core.StandardContext start
> SEVERE: Context [/hudson] startup failed due to previous errors
> Reverting to 1.461 solve the issue.