MSC throws exception "Empty name segment is not allowed" but does not give any hints about what element in the deployment descriptors has a problem. This error message should be improved.

If you have <security-domain/> in a war/WEB-INF/jboss-web.xml, you get this error below:

08:37:34,784 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) Starting deployment of "bug.war"
08:37:34,847 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC00001: Failed to start service jboss.deployment.unit."bug.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."bug.war".INSTALL: Failed to process phase INSTALL of deployment "bug.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:121) [jboss-as-server-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_27]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_27]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_27]
Caused by: java.lang.IllegalArgumentException: Empty name segment is not allowed
at org.jboss.msc.service.ServiceName.of(ServiceName.java:85) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at org.jboss.msc.service.ServiceName.append(ServiceName.java:112) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at org.jboss.as.web.deployment.WarDeploymentProcessor.processDeployment(WarDeploymentProcessor.java:215)
at org.jboss.as.web.deployment.WarDeploymentProcessor.deploy(WarDeploymentProcessor.java:112)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115) [jboss-as-server-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
... 5 more