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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. ,
    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    This might be caused by and outdated version of Java, SonarQube now uses Java 8 as default.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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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:676)	at org.apache.felix.framework.ModuleImpl$ModuleClassLoader.findClass(ModuleImpl.java:1872)	at org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:758)	at org.apache.felix.framework.ModuleImpl.access$100(ModuleImpl.java:61)	at org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1733)	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)	at org.apache.felix.framework.ModuleImpl.getClassByDelegation(ModuleImpl.java:674)	at org.apache.felix.framework.searchpolicy.R4Wire.getClass(R4Wire.java:108)	at org.apache.felix.framework.ModuleImpl.searchImports(ModuleImpl.java:1440)	at org.apache.felix.framework.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:753)	at org.apache.felix.framework.ModuleImpl.access$100(ModuleImpl.java:61)	at org.apache.felix.framework.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1733)	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)	at org.springframework.roo.addon.gwt.GwtMetadataProvider.getProvidesType(GwtMetadataProvider.java:206)	at org.springframework.roo.addon.gwt.GwtMetadataProvider.activate(GwtMetadataProvider.java:194)