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java.lang.NullPointerException: 	at org.apache.log4j.Category.isEnabledFor(Category.java:746)	at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)	at org.apache.catalina.startup.TldConfig.tldScanResourcePaths(TldConfig.java:582)	at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:283)	at org.apache.catalina.core.StandardContext.processTlds(StandardContext.java:4307)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4144)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)	at org.apache.catalina.core.StandardService.start(StandardService.java:448)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)	at org.apache.catalina.startup.Catalina.start(Catalina.java:552)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)