java.lang.NoClassDefFoundError: org/apache/log4j/AppenderSkeleton

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java.lang.NoClassDefFoundError: org/apache/log4j/AppenderSkeleton
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at com.bea.wlw.runtime.core.util.InternalLogger.(InternalLogger.java:23)
at com.bea.wlw.runtime.core.servlet.WebappContextListener.(WebappContextListener.java:38)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:308)
at java.lang.Class.newInstance(Class.java:261)
at weblogic.servlet.internal.WebAppServletContext.registerEventListener(WebAppServletContext.java:2992)
at weblogic.servlet.internal.WebAppServletContext.activateFromDescriptors(WebAppServletContext.java:2532)
at weblogic.servlet.internal.WebAppServletContext.activate(WebAppServletContext.java:6217)
at weblogic.servlet.internal.WebAppServletContext.setActive(WebAppServletContext.java:6195)
at weblogic.j2ee.J2EEApplicationContainer.activateModule(J2EEApplicationContainer.java:3385)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2248)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2221)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2169)
at weblogic.management.deploy.slave.SlaveDeployer$Application.setActivation(SlaveDeployer.java:3111)
at weblogic.management.deploy.slave.SlaveDeployer.setActivationStateForAllApplications(SlaveDeployer.java:1769)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:352)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemManager.java:136)
at weblogic.t3.srvr.T3Srvr.resume(T3Srvr.java:965)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:360)
at weblogic.Server.main(Server.java:32)

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