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java.lang.InternalError: Metadata does not appear to be polymorphic	at sun.jvm.hotspot.types.basic.BasicTypeDataBase.findDynamicTypeForAddress(BasicTypeDataBase.java:278)	at sun.jvm.hotspot.runtime.VirtualBaseConstructor.instantiateWrapperFor(VirtualBaseConstructor.java:102)	at sun.jvm.hotspot.oops.Metadata.instantiateWrapperFor(Metadata.java:68)	at sun.jvm.hotspot.memory.DictionaryEntry.klass(DictionaryEntry.java:71)	at sun.jvm.hotspot.memory.DictionaryEntry.equals(DictionaryEntry.java:79)	at sun.jvm.hotspot.memory.Dictionary.getEntry(Dictionary.java:99)	at sun.jvm.hotspot.memory.Dictionary.find(Dictionary.java:87)	at sun.jvm.hotspot.memory.SystemDictionary.find(SystemDictionary.java:159)	at sun.jvm.hotspot.memory.SystemDictionary.find(SystemDictionary.java:151)	at sun.jvm.hotspot.memory.SystemDictionary.getAbstractOwnableSynchronizerKlass(SystemDictionary.java:135)	at sun.jvm.hotspot.runtime.ConcurrentLocksPrinter.fillLocks(ConcurrentLocksPrinter.java:66)	at sun.jvm.hotspot.runtime.ConcurrentLocksPrinter.(ConcurrentLocksPrinter.java:36)	at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:71)	at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)	at sun.jvm.hotspot.tools.JStack.run(JStack.java:66)	at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)	at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)	at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)	at sun.jvm.hotspot.tools.JStack.main(JStack.java:92)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.tools.jstack.JStack.runJStackTool(JStack.java:140)	at sun.tools.jstack.JStack.main(JStack.java:106)