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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)	at org.apache.catalina.loader.WebappClassLoader.loadedByThisOrChild(WebappClassLoader.java:2639)	at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks(WebappClassLoader.java:2554)	at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalsForLeaks(WebappClassLoader.java:2509)	at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:2015)	at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1910)	at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:661)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5769)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1590)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1579)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)