Acessando nome do persistence-unit em um servletlistener EAR

Vê se estou fazendo certo, no meu ambiente tendo um ear, uma jar com as classes de jpa, e um war com a parte web.
preciso acessar o persistence-unit dentro de um servletlistener. estou fazendo assim.

Esta correto essa abordagem.

ele da esse erro

java.lang.IllegalArgumentException: Container org.jboss.web.tomcat.service.TomcatInjectionContainer@70ce2e failed to resolve persistence unit JPA.jar#p-unit
	at org.jboss.injection.PersistenceUnitHandler.addPUDependency(PersistenceUnitHandler.java:135)
	at org.jboss.injection.PersistenceUnitHandler.loadXml(PersistenceUnitHandler.java:75)
	at org.jboss.web.tomcat.service.TomcatInjectionContainer.processMetadata(TomcatInjectionContainer.java:550)
	at org.jboss.web.tomcat.service.WebCtxLoader.start(WebCtxLoader.java:158)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4272)
	at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:310)
	at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:142)
	at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:461)
	at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118)
	at org.jboss.web.deployers.WebModule.start(WebModule.java:97)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
	at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
	at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:206)
	at $Proxy38.start(Unknown Source)
	at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:42)
	at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:37)
	at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
	at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
	at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
	at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
	at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:286)
	at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
	at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
	at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
	at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
	at org.jboss.system.ServiceController.doChange(ServiceController.java:688)
	at org.jboss.system.ServiceController.start(ServiceController.java:460)
	at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:163)
	at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:99)
	at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46)
	at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62)
	at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
	at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1178)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1210)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098)
	at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
	at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
	at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
	at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
	at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
	at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
	at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781)
	at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702)
	at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117)
	at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362)
	at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalArgumentException: Can't find a deployment unit named PA.jar at AbstractVFSDeploymentContext@9149170{vfsfile:/C:/jboss-5.1.0.GA/server/default/deploy/S.ear/SWeb.war/}
	at org.jboss.jpa.resolvers.BasePersistenceUnitDependencyResolver.getDeploymentUnit(BasePersistenceUnitDependencyResolver.java:87)
	at org.jboss.jpa.resolvers.BasePersistenceUnitDependencyResolver.resolvePersistenceUnitSupplier(BasePersistenceUnitDependencyResolver.java:97)
	at org.jboss.web.tomcat.service.TomcatInjectionContainer.resolvePersistenceUnitSupplier(TomcatInjectionContainer.java:685)
	at org.jboss.injection.PersistenceUnitHandler.addPUDependency(PersistenceUnitHandler.java:130)
	... 67 more

olá amigo, esperiemnte especificar somente a persistense unit:

fallow

já tentei
a estrutura esta assim

s.ear
jpa.jar
web.war

esse servlet esta no web.war, quando publico aplicação ja gera esse erro de não encontrar o persistence unit

eu acho q o web.war não esta "enchergando" o persistence.xml que esta jpa.jar(modulo EJB) como posso resolver isso.

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