Same persistence unit names in unrelated deployments cause service name collision, prevents deployment ("Service jboss.naming.context.java.myEMF is already registered")

11:03:13,184 INFO  [org.jboss.as.repository] (management-handler-thread - 11) JBAS014900: Content added at location /home/ondra/work/AS7/ozizka-git2/build/target/jboss-as-7.1.1.Final-redhat-1/standalone/data/content/d7/ef102ffa0086dd1ed05a85c063618f1ddab907/content
11:03:13,300 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-15) JBAS015876: Starting deployment of "as7-quickstart-wicket-war.war"
11:03:15,144 INFO  [org.jboss.as.jpa] (MSC service thread 1-15) JBAS011401: Read persistence.xml for defaultPersistenceUnit
11:03:15,213 INFO  [org.jboss.weld.deployer] (MSC service thread 1-12) JBAS016002: Processing weld deployment as7-quickstart-wicket-war.war
11:03:15,326 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-12) JNDI bindings for session bean named ContactDaoBean in deployment unit deployment "as7-quickstart-wicket-war.war" are as follows:

        java:global/as7-quickstart-wicket-war/ContactDaoBean!org.jboss.as.quickstarts.wicket.war.dao.ContactDaoLocal
        java:app/as7-quickstart-wicket-war/ContactDaoBean!org.jboss.as.quickstarts.wicket.war.dao.ContactDaoLocal
        java:module/ContactDaoBean!org.jboss.as.quickstarts.wicket.war.dao.ContactDaoLocal
        java:global/as7-quickstart-wicket-war/ContactDaoBean
        java:app/as7-quickstart-wicket-war/ContactDaoBean
        java:module/ContactDaoBean

11:03:15,566 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-14) MSC00001: Failed to start service jboss.deployment.unit."as7-quickstart-wicket-war.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."as7-quickstart-wicket-war.war".INSTALL: Failed to process phase INSTALL of deployment "as7-quickstart-wicket-war.war"
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:119) [jboss-as-server-7.1.1.Final-redhat-1.jar:7.1.1.Final-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_26]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_26]
        at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_26]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS011446: Failed to add persistence unit service for defaultPersistenceUnit
        at org.jboss.as.jpa.processor.PersistenceUnitDeploymentProcessor.deployPersistenceUnit(PersistenceUnitDeploymentProcessor.java:383)
        at org.jboss.as.jpa.processor.PersistenceUnitDeploymentProcessor.addPuService(PersistenceUnitDeploymentProcessor.java:258)
        at org.jboss.as.jpa.processor.PersistenceUnitDeploymentProcessor.handleWarDeployment(PersistenceUnitDeploymentProcessor.java:194)
        at org.jboss.as.jpa.processor.PersistenceUnitDeploymentProcessor.deploy(PersistenceUnitDeploymentProcessor.java:118)
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:113) [jboss-as-server-7.1.1.Final-redhat-1.jar:7.1.1.Final-redhat-1]
        ... 5 more
Caused by: org.jboss.msc.service.DuplicateServiceException: Service jboss.naming.context.java.myEMF is already registered
        at org.jboss.msc.service.ServiceRegistrationImpl.setInstance(ServiceRegistrationImpl.java:154) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceControllerImpl.startInstallation(ServiceControllerImpl.java:227) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceContainerImpl.install(ServiceContainerImpl.java:560) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2228) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2228) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.msc.service.ServiceBuilderImpl.install(ServiceBuilderImpl.java:307) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
        at org.jboss.as.jpa.processor.PersistenceUnitDeploymentProcessor.deployPersistenceUnit(PersistenceUnitDeploymentProcessor.java:358)
        ... 9 more

11:03:15,835 INFO  [org.jboss.as.server] (management-handler-thread - 11) JBAS015870: Deploy of deployment "as7-quickstart-wicket-war.war" was rolled back with failure message {"JBAS014671: Failed services" => {"jboss.deployment.unit.\"as7-quickstart-wicket-war.war\".INSTALL" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"as7-quickstart-wicket-war.war\".INSTALL: Failed to process phase INSTALL of deployment \"as7-quickstart-wicket-war.war\""}}
11:03:15,861 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-8) JBAS015877: Stopped deployment as7-quickstart-wicket-war.war in 26ms
11:03:15,863 INFO  [org.jboss.as.controller] (management-handler-thread - 11) JBAS014774: Service status report
JBAS014777:   Services which failed to start:      service jboss.deployment.unit."as7-quickstart-wicket-war.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."as7-quickstart-wicket-war.war".INSTALL: Failed to process phase INSTALL of deployment "as7-quickstart-wicket-war.war"