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

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Expert tip

This might be caused by and outdated version of Java, SonarQube now uses Java 8 as default.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 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
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 winstone.classLoader.WebappClassLoader.loadClass(WebappClassLoader.java:68)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at hudson.DNSMultiCast.(DNSMultiCast.java:26)
at hudson.model.Hudson.(Hudson.java:691)
at hudson.model.Hudson.(Hudson.java:605)
at hudson.WebAppMain$2.run(WebAppMain.java:221)

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