How did you fix it please let us know as I am also facing this issue. My JBoss is using 1.6 Java but still Iam facing issue with <> <1356537043559> <BEA-101216> <Servlet: "AppLogInvoker" failed to preload on startup in Web application: "grpltcAppWiz.war". java.lang.UnsupportedClassVersionError: unsupported classversion 50.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:570) at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:258) at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:241) at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:88) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.drools.rule.MVELDialectRuntimeData.getParserConfiguration(MVELDialectRuntimeData.java:259) at org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:208) at org.drools.base.mvel.MVELConsequence.compile(MVELConsequence.java:74) at org.drools.rule.MVELDialectRuntimeData.onBeforeExecute(MVELDialectRuntimeData.java:162) at org.drools.rule.DialectRuntimeRegistry.onBeforeExecute(DialectRuntimeRegistry.java:138) at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:511) at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458) at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150) at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016)
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