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  1. ,
    via Stack Overflow by ERJAN

    This exception occurs when using an older version of java. Mainly when trying to run a jar compiled with a newer Java version in an older Java version. We can avoid this issue by executing the jar in the same version which it was compiled.

  2. ,
    via Google Groups by Marcus Haebler

    Update "latest" to Java 8 on DockerHub.

Solutions on the web

via Jenkins JIRA by Matt Smollinger, 2 years ago
java.lang.UnsupportedClassVersionError: net/hockeyapp/jenkins/releaseNotes/ChangelogReleaseNotes$DescriptorImpl : Unsupported major.minor version 51.0
via Jenkins JIRA by Matt Smollinger, 1 year ago
java.lang.UnsupportedClassVersionError: net/hockeyapp/jenkins/releaseNotes/ChangelogReleaseNotes$DescriptorImpl : Unsupported major.minor version 51.0
via Jenkins JIRA by Markus KARG, 1 year ago
file:/usr/share/tomcat6/.jenkins/plugins/git/WEB-INF/classes/META-INF/annotations/hudson.Extension might need to be rebuilt: java.lang.ClassNotFoundException: hudson.plugins.git.GitSCM$DescriptorImpl
via Jenkins JIRA by Markus KARG, 2 years ago
file:/usr/share/tomcat6/.jenkins/plugins/git/WEB-INF/classes/META-INF/annotations/hudson.Extension might need to be rebuilt: java.lang.ClassNotFoundException: hudson.plugins.git.GitSCM$DescriptorImpl
via Google Groups by rdesg...@java.net (JIRA), 2 years ago
file:/home/jenkins/plugins/robot/WEB-INF/classes/META-INF/annotations/hudson.Extension might need to be rebuilt: java.lang.ClassNotFoundException: hudson.plugins.robot.tokens.RobotPassPercentageTokenMacr o
java.lang.InstantiationException: java.lang.UnsupportedClassVersionError: net/hockeyapp/jenkins/releaseNotes/ChangelogReleaseNotes$DescriptorImpl : Unsupported major.minor version 51.0 at net.java.sezpoz.IndexItem.element(IndexItem.java:146) at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:666) at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:349) at hudson.ExtensionList.load(ExtensionList.java:300) at hudson.ExtensionList.ensureLoaded(ExtensionList.java:253) at hudson.ExtensionList.iterator(ExtensionList.java:143) at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:348) at hudson.ExtensionList.load(ExtensionList.java:300) at hudson.ExtensionList.ensureLoaded(ExtensionList.java:253) at hudson.ExtensionList.size(ExtensionList.java:162) at com.sonyericsson.hudson.plugins.gerrit.trigger.PluginImpl.postInitialize(PluginImpl.java:298) at hudson.PluginManager$2$1$2.run(PluginManager.java:386) at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169) at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282) at jenkins.model.Jenkins$7.runTask(Jenkins.java:903) 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$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:695)Caused by: java.lang.UnsupportedClassVersionError: net/hockeyapp/jenkins/releaseNotes/ChangelogReleaseNotes$DescriptorImpl : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1138) at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:768) 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.GeneratedMethodAccessor3.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44) at jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:86) at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1110) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at net.java.sezpoz.IndexItem.element(IndexItem.java:134) ... 19 more