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java.lang.NoClassDefFoundError: org/apache/log4j/Layout	at org.apache.commons.logging.impl.Log4jFactory.getInstance(Log4jFactory.java:140)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:253)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:375)	at org.apache.struts.action.ActionServlet.(ActionServlet.java:375)	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:306)	at java.lang.Class.newInstance(Class.java:259)	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:889)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:813)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3346)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:3592)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:638)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:345)	at org.apache.catalina.startup.Embedded.start(Embedded.java:957)	at com.iplanet.ias.web.WebContainer.start(WebContainer.java:426)	at com.iplanet.ias.web.WebContainer.startInstance(WebContainer.java:514)	at com.iplanet.ias.server.J2EERunner.confPostInit(J2EERunner.java:170)