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java.lang.NullPointerException: 	at org.apache.catalina.loader.WebappClassLoader.loadedByThisOrChild(WebappClassLoader.java:2584)	at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks(WebappClassLoader.java:2500)	at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalsForLeaks(WebappClassLoader.java:2455)	at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1996)	at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1902)	at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:662)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5669)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)	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:744)