Weblogic upgrade to 12c: deployment fails because url mapped to multiple servlet

Question

I've recently setup a new Weblogic 12c environment. On deploying an application that I know works in Weblogic 11g I get the error "The url-pattern /resources/* in web application is mapped to multiple Servlets."

The mapping it's referring to is in the web.xml inside the application.ear that's being deployed, but it's only mapped once:

  <servlet-mapping>
    <servlet-name>velocity</servlet-name>
    <url-pattern>/resources/*</url-pattern>
  </servlet-mapping> 

The project doesn't contain any other references to the url pattern /resources/*, can someone explain where the duplicated mapping is coming from and how I can work around it?

The closest issue I could find is this: https://bugster.forgerock.org/jira/si/jira.issueviews:issue-html/OPENAM-7947/OPENAM-7947.html, which has been marked as unreproducible.

Full stack trace from deployment:

<Error> <Deployer> <BEA-149205> <Failed to initialize the application "<application_name>" due to error weblogic.application.ModuleException: weblogic.management.DeploymentException: [HTTP:101401]The url-pa
ttern /resources/* in web application <application_name> is mapped to multiple Servlets.
weblogic.application.ModuleException: weblogic.management.DeploymentException: [HTTP:101401]The url-pattern /resources/* in web application <application_name> is mapped to multiple Servlets.
        at weblogic.application.internal.ExtensibleModuleWrapper.prepare(ExtensibleModuleWrapper.java:114)
        at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:100)
        at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:192)
        at weblogic.application.internal.flow.ModuleStateDriver$1.next(ModuleStateDriver.java:187)
        at weblogic.application.utils.StateMachineDriver$ParallelChange.run(StateMachineDriver.java:83)
        at weblogic.application.utils.StateMachineDriver.nextStateInParallel(StateMachineDriver.java:144)
        at weblogic.application.internal.flow.ModuleStateDriver.parallelPrepare(ModuleStateDriver.java:46)
        at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:75)
        at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:55)
        at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:731)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
        at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:243)
        at weblogic.application.internal.EarDeployment.prepare(EarDeployment.java:66)
        at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:158)
        at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:65)
        at weblogic.deploy.internal.targetserver.AppDeployment.prepare(AppDeployment.java:158)
        at weblogic.management.deploy.internal.DeploymentAdapter$1.doPrepare(DeploymentAdapter.java:41)
        at weblogic.management.deploy.internal.DeploymentAdapter.prepare(DeploymentAdapter.java:193)
        at weblogic.management.deploy.internal.AppTransition$1.transitionApp(AppTransition.java:31)
        at weblogic.management.deploy.internal.ConfiguredDeployments$2.doItem(ConfiguredDeployments.java:684)
        at weblogic.management.deploy.internal.parallel.BucketInvoker.invoke(BucketInvoker.java:138)
        at weblogic.management.deploy.internal.ConfiguredDeployments.transitionAppsParallel(ConfiguredDeployments.java:692)
        at weblogic.management.deploy.internal.ConfiguredDeployments.prepare(ConfiguredDeployments.java:322)
        at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:202)
        at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:207)
        at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:129)
        at weblogic.server.AbstractServerService.postConstruct(AbstractServerService.java:76)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.glassfish.hk2.utilities.reflection.ReflectionHelper.invoke(ReflectionHelper.java:1262)
        at org.jvnet.hk2.internal.ClazzCreator.postConstructMe(ClazzCreator.java:332)
        at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:374)
        at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
        at org.glassfish.hk2.runlevel.internal.AsyncRunLevelContext.findOrCreate(AsyncRunLevelContext.java:232)
        at org.glassfish.hk2.runlevel.RunLevelContext.findOrCreate(RunLevelContext.java:85)
        at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
        at org.jvnet.hk2.internal.ServiceHandleImpl.getService(ServiceHandleImpl.java:114)
        at org.jvnet.hk2.internal.ServiceHandleImpl.getService(ServiceHandleImpl.java:88)
        at org.glassfish.hk2.runlevel.internal.CurrentTaskFuture$QueueRunner.oneJob(CurrentTaskFuture.java:1213)
        at org.glassfish.hk2.runlevel.internal.CurrentTaskFuture$QueueRunner.run(CurrentTaskFuture.java:1144)
        at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:666)
        at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:348)
        at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:333)
        at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:54)
        at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
        at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:640)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:406)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:346)

Answer 1

If you use web annotations in java code, you don't have to declare the servlet in the web.xml file any more.

You can try by removing the corresponding "servlet" and "servlet-mapping" tags in web.xml

It seems that WebLogic 12.1.3 can deal with double declaration (inline annotation & xml) but not anymore in WebLogic 12.2.

I had this error with @webservice annotation when I specified the "serviceName" parameter and when I declared the servlet in web.xml file with the same value.