UnsupportedClassVersionError is thrown while adding user. --------------------------------------------------------- Key: WFLY-3887 URL: https://issues.jboss.org/browse/WFLY-3887 Project: WildFly Issue Type: Bug Components: Domain Management, Security Affects Versions: 8.1.0.Final, 9.0.0.Alpha1 Environment: Windows Server 2008 Java 8u20 Reporter: shinzey shinzey Assignee: Darran Lofthouse Labels: domain, security Fix For: 8.1.0.Final The server can be successfully started, but I'm unable to manage it because running add-user.bat immediately fails with the following error: Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jboss/as/domain/management/security/adduser/AddUser : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:361) at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:482) at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:277) at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:92) at org.jboss.modules.Module.loadModuleClass(Module.java:568) at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:205) at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:447) at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:414) at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.jboss.modules.Module.run(Module.java:300) at org.jboss.modules.Main.main(Main.java:460)