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java.lang.StackOverflowError: 	at sun.misc.Unsafe.getObjectVolatile(Native Method)	at java.util.concurrent.ConcurrentHashMap.tabAt(ConcurrentHashMap.java:755)	at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1018)	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1535)	at java.lang.ClassLoader.getClassLoadingLock(ClassLoader.java:463)	at java.lang.ClassLoader.loadClass(ClassLoader.java:404)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at com.oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:277)	at com.oracle.classloader.weblogic.LaunchClassLoader.loadClass(LaunchClassLoader.java:62)