Issue

During startup, jboss sometimes complains about duplicate deployments (but not on every startup) and throws the following Exception:

ERROR [org.jboss.msc.service] (MSC service thread 1-8) MSC000002: Invocation of listener "org.jboss.as.connector.util.RaServicesFactory$1@1c6338ba" failed: java.lang.IllegalStateException: JBAS014666: Duplicate resource resource-adapters
        at org.jboss.as.controller.registry.AbstractModelResource$DefaultResourceProvider.register(AbstractModelResource.java:225) [jboss-as-controller-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
        at org.jboss.as.controller.registry.AbstractModelResource.registerChild(AbstractModelResource.java:135) [jboss-as-controller-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
        at org.jboss.as.connector.deployers.ra.processors.AbstractResourceAdapterDeploymentServiceListener.transition(AbstractResourceAdapterDeploymentServiceListener.java:122) [jboss-as-connector-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
        at org.jboss.msc.service.ServiceControllerImpl.invokeListener(ServiceControllerImpl.java:1565) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl.access$2800(ServiceControllerImpl.java:52) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$ListenerTask.run(ServiceControllerImpl.java:2131) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_55]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_55]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_55]