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java.lang.StackOverflowError: 	at sun.misc.Unsafe.getObjectVolatile(Native Method)	at java.util.concurrent.ConcurrentHashMap.tabAt(	at java.util.concurrent.ConcurrentHashMap.putVal(	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(	at java.lang.ClassLoader.getClassLoadingLock(	at java.lang.ClassLoader.loadClass(	at sun.misc.Launcher$AppClassLoader.loadClass(	at java.lang.ClassLoader.loadClass(	at	at