The getClosure() method does not synchronize on get. This leads to multiple Weld deployments on AS7 calling the get method, all at once and leads to the following error:

java.lang.NullPointerException
at org.jboss.weld.manager.BeanManagerImpl.getMostSpecializedBean(BeanManagerImpl.java:931)
at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:605)
at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:228)
at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:207)
at org.jboss.weld.bootstrap.events.AbstractContainerEvent.fire(AbstractContainerEvent.java:75)
at org.jboss.weld.bootstrap.events.AbstractDefinitionContainerEvent.fire(AbstractDefinitionContainerEvent.java:46)
at org.jboss.weld.bootstrap.events.BeforeBeanDiscoveryImpl.fire(BeforeBeanDiscoveryImpl.java:46)
at org.jboss.weld.bootstrap.WeldBootstrap.startInitialization(WeldBootstrap.java:322)
at org.jboss.as.weld.WeldContainer.start(WeldContainer.java:80)
at org.jboss.as.weld.services.WeldService.start(WeldService.java:89)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)