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  1. ,
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    This might be caused by and outdated version of Java, SonarQube now uses Java 8 as default. You might upgrade java or use an older version of SonarQube.

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    If you're using intellij plugin of sonarqube, you might have to set the JAVA_HOME ambient variable manually.

Solutions on the web

via Jenkins JIRA by Brian Hicks, 1 year ago
Bad version number in .class file
via Jenkins JIRA by Brian Hicks, 1 year ago
Bad version number in .class file
via Stack Overflow by alex
, 2 years ago
Bad version number in .class file
via gotoanswer.com by Unknown author, 2 years ago
via Stack Overflow by Suvasis
, 2 years ago
via Stack Overflow by TyC
, 2 years ago
Bad version number in .class file
java.lang.UnsupportedClassVersionError: Bad version number in .class file	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)	at java.net.URLClassLoader.access$100(URLClassLoader.java:56)	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)	at hudson.plugins.jabber.im.transport.JabberPublisherDescriptor.(JabberPublisherDescriptor.java:73)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:242)	at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:439)	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:283)	at hudson.ExtensionList.load(ExtensionList.java:258)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:229)	at hudson.ExtensionList.iterator(ExtensionList.java:136)	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:282)	at hudson.ExtensionList.load(ExtensionList.java:258)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:229)	at hudson.ExtensionList.getComponents(ExtensionList.java:147)	at hudson.DescriptorExtensionList.load(DescriptorExtensionList.java:181)	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:229)	at hudson.ExtensionList.iterator(ExtensionList.java:136)	at org.jenkinsci.plugins.xunit.AliasInitializer.addAliases(AliasInitializer.java:23)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:114)	at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:178)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)	at jenkins.model.Jenkins$5.runTask(Jenkins.java:798)	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)	at java.lang.Thread.run(Thread.java:595)