What is the meaning of error JBAS011084 componentClassName is null ?

Issue

• What does this error mean when deploying an MDB:

15:08:41,836 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-4) MSC000001: Failed to start service jboss.deployment.subunit."TestEAR.ear"."TestEJB.jar".PARSE: org.jboss.msc.service.StartException in service  jboss.deployment.subunit."TestEAR.ear"."TestEJB.jar" .PARSE: JBAS018733: Failed to process phase PARSE of subdeployment "TestEJB.jar" of deployment "TestEAR.ear"
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:127) [jboss-as-server-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_10]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_10]
        at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_10]
Caused by: java.lang.IllegalArgumentException: JBAS011084: componentClassName is null
        at org.jboss.as.ee.component.ComponentDescription.<init>(ComponentDescription.java:144)
        at org.jboss.as.ejb3.component.EJBComponentDescription.<init>(EJBComponentDescription.java:264)
        at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponentDescription.<init>(MessageDrivenComponentDescription.java:94)
        at org.jboss.as.ejb3.deployment.processors.MessageDrivenComponentDescriptionFactory.processMessageDrivenBeanMetaData(MessageDrivenComponentDescriptionFactory.java:242)
        at org.jboss.as.ejb3.deployment.processors.MessageDrivenComponentDescriptionFactory.processBeanMetaData(MessageDrivenComponentDescriptionFactory.java:87)
        at org.jboss.as.ejb3.deployment.processors.AnnotatedEJBComponentDescriptionDeploymentUnitProcessor.processBeanMetaData(AnnotatedEJBComponentDescriptionDeploymentUnitProcessor.java:65)
        at org.jboss.as.ejb3.deployment.processors.AbstractDeploymentUnitProcessor.processDeploymentDescriptor(AbstractDeploymentUnitProcessor.java:143)
        at org.jboss.as.ejb3.deployment.processors.AbstractDeploymentUnitProcessor.deploy(AbstractDeploymentUnitProcessor.java:84)
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:120) [jboss-as-server-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]