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This exception has no message.
org.apache.log4j.LogManager: 	at org.apache.log4j.Logger.getLogger(Logger.java:118)	at org.childhealthcare.diagnosis.servlet.SessionAttributeListener.(SessionAttributeListener.java:20)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeMethod)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at java.lang.Class.newInstance0(Class.java:355)	at java.lang.Class.newInstance(Class.java:308)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3916)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.access$000(ContainerBase.java:123)	at org.apache.catalina.core.ContainerBase$PrivilegedAddChild.run(ContainerBase.java:145)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:769)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637)	at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:563)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)	at org.apache.catalina.core.StandardService.start(StandardService.java:519)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)	at org.apache.catalina.startup.Catalina.start(Catalina.java:581)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)