请问在weblogic上发布war时，发生以下错误，是什么原因？

numeleven 2007-06-06 04:48:16

java.lang.NoClassDefFoundError
[java] at java.lang.Class.forName0(Native Method)
[java] at java.lang.Class.forName(Class.java:164)
[java] at org.apache.commons.logging.LogFactory$2.run(LogFactory.java:568)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:517)
[java] at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:308)
[java] at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
[java] at org.apache.struts.action.ActionServlet.<clinit>(ActionServlet.java:226)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
[java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
[java] at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
[java] at java.lang.Class.newInstance0(Class.java:350)
[java] at java.lang.Class.newInstance(Class.java:303)
[java] at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:250)
[java] at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
[java] at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
[java] at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:68)
[java] at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
[java] at weblogic.servlet.internal.StubLifecycleHelper.<init>(StubLifecycleHelper.java:48)
[java] at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:504)
[java] at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:1698)
[java] at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:1675)
[java] at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1595)
[java] at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:2734)
[java] at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:892)
[java] at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:336)
[java] at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:204)
[java] at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
[java] at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
[java] at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)
[java] at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:117)
[java] at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:204)
[java] at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
[java] at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
[java] at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:26)
[java] at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:641)
[java] at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
[java] at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:229)
[java] at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:154)
[java] at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:80)
[java] at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:565)
[java] at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:136)
[java] at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:104)
[java] at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:320)
[java] at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:815)
[java] at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1222)
[java] at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:433)
[java] at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:161)
[java] at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
[java] at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
[java] at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
[java] at weblogic.work.ServerWorkManagerImpl$WorkAdapterImpl.run(ServerWorkManagerImpl.java:518)
[java] at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
[java] at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

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