java.lang.UnsupportedClassVersionError: Bad version number in .class file

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This might be caused by and outdated version of Java, SonarQube now uses Java 8 as default.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 Andreas Mandel, 1 year ago
Bad version number in .class file
via Jenkins JIRA by Andreas Mandel, 1 year ago
Bad version number in .class file
via Google Groups by Steffen, 2 years ago
Bad version number in .class file
via Google Groups by Matt Raible, 2 years ago
Bad version number in .class file
via Stack Overflow by eskalera
, 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:621)
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 org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:389)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:242)
at jenkins.maven3.agent.Maven31Main.main(Maven31Main.java:138)
at jenkins.maven3.agent.Maven31Main.main(Maven31Main.java:67)

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