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https://issues.apache.org/jira/browse/GROOVY-8217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16055039#comment-16055039
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Radoslav Ivanov commented on GROOVY-8217:
-----------------------------------------

Still can't reproduce it. Please mark this as a duplicate and close it. If we 
reproduce it, we will reopen that. Thanks.

> java.lang.ClassNotFoundException: java$lang$Enum
> ------------------------------------------------
>
>                 Key: GROOVY-8217
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8217
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-runtime
>    Affects Versions: 2.4.8
>            Reporter: Radoslav Ivanov
>            Priority: Critical
>
> Hi guys
> It looks like we are hitting pretty rare but severe problem [2]. Note that 
> restart fixed the problem as it was also suggested here [1].
> Regards
> Rado
> Details
> 1. 
> https://stackoverflow.com/questions/40854472/java-lang-classnotfoundexception-java-langenum-in-jenkins-2-0-while-executing
> 2. Caused by: java.lang.TypeNotPresentException: Type java$lang$Enum not 
> present
>       at 
> sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:117)
>  [rt.jar:1.8.0_112]
>       at 
> sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
>  [rt.jar:1.8.0_112]
>       at 
> sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
>  [rt.jar:1.8.0_112]
>       at 
> sun.reflect.generics.repository.ClassRepository.getSuperclass(ClassRepository.java:90)
>  [rt.jar:1.8.0_112]
>       at java.lang.Class.getGenericSuperclass(Class.java:777) 
> [rt.jar:1.8.0_112]
>       at 
> com.sun.beans.finder.MethodFinder.findAccessibleMethod(MethodFinder.java:151) 
> [rt.jar:1.8.0_112]
>       at 
> java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1344) 
> [rt.jar:1.8.0_112]
>       at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1197) 
> [rt.jar:1.8.0_112]
>       at java.beans.Introspector.getBeanInfo(Introspector.java:426) 
> [rt.jar:1.8.0_112]
>       at java.beans.Introspector.getBeanInfo(Introspector.java:173) 
> [rt.jar:1.8.0_112]
>       at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:3313) 
> [groovy-2.4.8.jar:2.4.8]
>       at java.security.AccessController.doPrivileged(Native Method) 
> [rt.jar:1.8.0_112]
>       at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3311) 
> [groovy-2.4.8.jar:2.4.8]
>       at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3288) 
> [groovy-2.4.8.jar:2.4.8]
>       at 
> org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:271)
>  [groovy-2.4.8.jar:2.4.8]
>       at 
> org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:313) 
> [groovy-2.4.8.jar:2.4.8]
>       at 
> org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.getMetaClass(MetaClassRegistryImpl.java:258)
>  [groovy-2.4.8.jar:2.4.8]
>       at 
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.selectConstructorAndTransformArguments(ScriptBytecodeAdapter.java:236)
>  [groovy-2.4.8.jar:2.4.8]
>       ... 11 more
> Caused by: java.lang.ClassNotFoundException: java$lang$Enum
>       at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
> [rt.jar:1.8.0_112]
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
> [rt.jar:1.8.0_112]
>       at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:677) 
> [groovy-2.4.8.jar:2.4.8]
>       at 
> groovy.lang.GroovyClassLoader$InnerLoader.loadClass(GroovyClassLoader.java:425)
>  [groovy-2.4.8.jar:2.4.8]
>       at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:787) 
> [groovy-2.4.8.jar:2.4.8]
>       at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:775) 
> [groovy-2.4.8.jar:2.4.8]
>       at java.lang.Class.forName0(Native Method) [rt.jar:1.8.0_112]
>       at java.lang.Class.forName(Class.java:348) [rt.jar:1.8.0_112]
>       at 
> sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
>  [rt.jar:1.8.0_112]
>       ... 30 more



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