高分跪求····着急 解决weblogic9.2 Unmarshaller failed问题

有一个web工程之前是在jboss下开发的，现在根据客户需要，要把工程移植到weblogic9.2下。此工程在jboss tomcat下均能正常运行。
但是我在weblogic9.2下无法正常发布。发生了错误，搞了我好几天都没有搞定。现在望高手们能救救小弟。谢谢了。
后台错误信息如下：
009-3-3 下午02时41分28秒 CST> <Error> <J2EE> <BEA-160197> <Unable to load descriptor D:\bea\user_projects\domains\base_domain\.\servers\AdminServer\stage\_appsdir_xhfm_war\xhfm.war/WEB-INF/web.xml of module xhfm.war. The error is weblogic.descriptor.DescriptorException: Unmarshaller failed
at weblogic.descriptor.internal.MarshallerFactory$1.createDescriptor(MarshallerFactory.java:147)
at weblogic.descriptor.DescriptorManager.createDescriptor(DescriptorManager.java:280)
at weblogic.descriptor.DescriptorManager.createDescriptor(DescriptorManager.java:248)
at weblogic.application.descriptor.AbstractDescriptorLoader2.getDescriptorBeanFromReader(AbstractDescriptorLoader2.java:749)
at weblogic.application.descriptor.AbstractDescriptorLoader2.createDescriptorBean(AbstractDescriptorLoader2.java:378)
at weblogic.application.descriptor.AbstractDescriptorLoader2.loadDescriptorBeanWithoutPlan(AbstractDescriptorLoader2.java:720)
at weblogic.application.descriptor.AbstractDescriptorLoader2.loadDescriptorBean(AbstractDescriptorLoader2.java:729)
at weblogic.servlet.internal.WebAppDescriptor.getWebAppBean(WebAppDescriptor.java:134)
at weblogic.servlet.internal.WebAppModule.loadDescriptor(WebAppModule.java:778)
at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:275)
at weblogic.application.internal.flow.ScopedModuleDriver.prepare(ScopedModuleDriver.java:176)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:93)
at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:360)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:56)
at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:46)
at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:621)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:26)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:208)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:147)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:61)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.createAndPrepareContainer(ActivateOperation.java:189)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doPrepare(ActivateOperation.java:87)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.prepare(AbstractOperation.java:217)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentPrepare(DeploymentManager.java:718)
at weblogic.deploy.internal.targetserver.DeploymentManager.prepareDeploymentList(DeploymentManager.java:1185)
at weblogic.deploy.internal.targetserver.DeploymentManager.handlePrepare(DeploymentManager.java:247)
at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.prepare(DeploymentServiceDispatcher.java:157)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doPrepareCallback(DeploymentReceiverCallbackDeliverer.java:157)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$000(DeploymentReceiverCallbackDeliverer.java:12)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$1.run(DeploymentReceiverCallbackDeliverer.java:45)
at weblogic.work.ServerWorkManagerImpl$WorkAdapterImpl.run(ServerWorkManagerImpl.java:518)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: com.bea.xml.XmlException: weblogic.descriptor.BeanAlreadyExistsException: Bean already exists: "weblogic.j2ee.descriptor.ServletMappingBeanImpl@c7fae83b(/ServletMappings[weblogic.descriptor.internal.CompoundKey@c6490b27])"
at com.bea.staxb.runtime.internal.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:54)
at com.bea.staxb.runtime.internal.RuntimeBindingType$BeanRuntimeProperty.setValue(RuntimeBindingType.java:483)
at com.bea.staxb.runtime.internal.AttributeRuntimeBindingType$QNameRuntimeProperty.fillCollection(AttributeRuntimeBindingType.java:385)
at com.bea.staxb.runtime.internal.MultiIntermediary.getFinalValue(MultiIntermediary.java:52)
at com.bea.staxb.runtime.internal.AttributeRuntimeBindingType.getFinalObjectFromIntermediary(AttributeRuntimeBindingType.java:145)
at com.bea.staxb.runtime.internal.UnmarshalResult.unmarshalBindingType(UnmarshalResult.java:185)
at com.bea.staxb.runtime.internal.UnmarshalResult.unmarshalDocument(UnmarshalResult.java:154)
at com.bea.staxb.runtime.internal.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:65)
at weblogic.descriptor.internal.MarshallerFactory$1.createDescriptor(MarshallerFactory.java:136)
... 33 more