java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
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$StopChild.call(ContainerBase.java:1590)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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