Server restart fails with persistent WAB deployment

04:55:16,854 INFO  [org.jboss.osgi.framework] (MSC service thread 1-2) JBOSGI011006: OSGi Framework - 2.0.0.CR21
04:55:17,211 INFO  [org.jboss.osgi.framework] (MSC service thread 1-1) JBOSGI011001: Bundle installed: jboss-osgi-logging:1.0.0
04:55:17,219 INFO  [org.jboss.osgi.framework] (MSC service thread 1-1) JBOSGI011001: Bundle installed: jboss-as-osgi-configadmin:7.2.0.Alpha1-SNAPSHOT
04:55:17,228 INFO  [org.jboss.osgi.framework] (MSC service thread 1-2) JBOSGI011001: Bundle installed: org.apache.felix.log:1.0.0
04:55:17,228 INFO  [org.jboss.osgi.framework] (MSC service thread 1-4) JBOSGI011001: Bundle installed: org.apache.felix.configadmin:1.2.8
04:55:17,479 INFO  [org.jboss.osgi.framework] (MSC service thread 1-4) JBOSGI011001: Bundle installed: updated-bundle.wab:1.0.1
04:55:17,922 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC00001: Failed to start service jboss.deployment.unit."updated-bundle.wab".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."updated-bundle.wab".INSTALL: JBAS018733: Failed to process phase INSTALL of deployment "updated-bundle.wab"
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:123) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
	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$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_33]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_33]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_33]
Caused by: java.lang.NullPointerException
	at org.jboss.as.osgi.web.WabServletContextServiceProcessor.registerServletContext(WabServletContextServiceProcessor.java:58)
	at org.jboss.as.osgi.web.WabServletContextServiceProcessor.deploy(WabServletContextServiceProcessor.java:52)
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:116) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
	... 5 more

04:55:17,938 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011011: Starting bundles for start level: 1
04:55:17,987 INFO  [org.jboss.as.server] (Controller Boot Thread) JBAS018559: Deployed "updated-bundle.wab"
04:55:18,009 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011002: Bundle started: org.apache.felix.configadmin:1.2.8
04:55:18,049 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011002: Bundle started: org.apache.felix.log:1.0.0
04:55:18,068 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011002: Bundle started: jboss-osgi-logging:1.0.0
04:55:18,100 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011002: Bundle started: jboss-as-osgi-configadmin:7.2.0.Alpha1-SNAPSHOT
04:55:18,102 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011002: Bundle started: updated-bundle.wab:1.0.1
04:55:18,115 INFO  [org.jboss.osgi.framework] (MSC service thread 1-3) JBOSGI011000: OSGi Framework started