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java.lang.NullPointerException at org.apache.catalina.loader.WebappClassLoader.loadedByThisOrChild(WebappClassLoader.java:2636) at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks(WebappClassLoader.java:2552) at org.apache.catalina.loader.WebappClassLoader.checkThreadLocalsForLeaks(WebappClassLoader.java:2507) at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:2013) at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1908) 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:5730) 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$StartChild.call(ContainerBase.java:1575) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722)