Weblogic部署时报错

还有个Error：
<2013-8-16 上午10时05分47秒 CST> <Error> <Console> <BEA-240003> <Console encount
ered the following error weblogic.application.ModuleException:
        at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:295)

        at weblogic.application.internal.flow.ScopedModuleDriver.prepare(ScopedM
oduleDriver.java:176)
        at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(Modu
leListenerInvoker.java:93)
        at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(Depl
oymentCallbackFlow.java:360)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineD
river.java:26)
        at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(Dep
loymentCallbackFlow.java:56)
        at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(Dep
loymentCallbackFlow.java:46)
        at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.ja
va:621)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineD
river.java:26)
        at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.j
ava:208)
        at weblogic.application.internal.DeploymentStateChecker.prepare(Deployme
ntStateChecker.java:147)
        at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(App
ContainerInvoker.java:61)
        at weblogic.deploy.internal.targetserver.operations.ActivateOperation.cr
eateAndPrepareContainer(ActivateOperation.java:189)
        at weblogic.deploy.internal.targetserver.operations.ActivateOperation.do
Prepare(ActivateOperation.java:87)
        at weblogic.deploy.internal.targetserver.operations.AbstractOperation.pr
epare(AbstractOperation.java:217)
        at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploym
entPrepare(DeploymentManager.java:718)
        at weblogic.deploy.internal.targetserver.DeploymentManager.prepareDeploy
mentList(DeploymentManager.java:1185)
        at weblogic.deploy.internal.targetserver.DeploymentManager.handlePrepare
(DeploymentManager.java:247)
        at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.pre
pare(DeploymentServiceDispatcher.java:157)
        at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallb
ackDeliverer.doPrepareCallback(DeploymentReceiverCallbackDeliverer.java:157)
        at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallb
ackDeliverer.access$000(DeploymentReceiverCallbackDeliverer.java:12)
        at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallb
ackDeliverer$1.run(DeploymentReceiverCallbackDeliverer.java:45)
        at weblogic.work.ServerWorkManagerImpl$WorkAdapterImpl.run(ServerWorkMan
agerImpl.java:518)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: java.lang.ClassNotFoundException: com.listener.OnlineListener
        at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(Generic
ClassLoader.java:286)
        at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClass
Loader.java:259)
        at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAw
areClassLoader.java:54)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClass
Loader.java:158)
        at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAw
areClassLoader.java:35)
        at weblogic.servlet.internal.EventsManager.registerEventListener(EventsM
anager.java:271)
        at weblogic.servlet.internal.EventsManager.registerEventListeners(Events
Manager.java:257)
        at weblogic.servlet.internal.WebAppServletContext.initContextListeners(W
ebAppServletContext.java:1573)
        at weblogic.servlet.internal.WebAppServletContext.prepare(WebAppServletC
ontext.java:1037)
        at weblogic.servlet.internal.HttpServer.doPostContextInit(HttpServer.jav
a:433)
        at weblogic.servlet.internal.HttpServer.loadWebApp(HttpServer.java:408)
        at weblogic.servlet.internal.WebAppModule.registerWebApp(WebAppModule.ja
va:552)
        at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:287)

>

求解答为什么会有这样的错误，是包冲突吗？ jsf-impl.jar？求解释，我的应用目录\WebRoot\WEB-INF\lib下没有jsf开头的包。

补充：Java ,  Java EE