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java.lang.UnsupportedOperationException: null	at com.zaxxer.hikari.util.FastList.iterator(FastList.java:209)	at org.apache.catalina.loader.WebappClassLoaderBase.loadedByThisOrChild(WebappClassLoaderBase.java:1986)	at org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks(WebappClassLoaderBase.java:1890)	at org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalsForLeaks(WebappClassLoaderBase.java:1844)	at org.apache.catalina.loader.WebappClassLoaderBase.clearReferences(WebappClassLoaderBase.java:1514)	at org.apache.catalina.loader.WebappClassLoaderBase.stop(WebappClassLoaderBase.java:1460)	at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:447)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:229)	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5436)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:229)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1419)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1408)	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)