If the MBeans for the patching subsystem are queried during server shutdown, it can result in an IllegalStateException. InstallationManagerService has already had stop() called on it, so the value is null.

This can be reproduced by the attached EJB, which does a MBeanServer.queryMBeans(null, null); from the @PreDestroy method. It's in a loop to ensure it runs after the installation manager gets de-initialised.

java.lang.IllegalStateException
at org.jboss.as.patching.installation.InstallationManagerService.getValue(InstallationManagerService.java:87) [wildfly-patching-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.patching.installation.InstallationManagerService.getValue(InstallationManagerService.java:28) [wildfly-patching-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.msc.service.ServiceControllerImpl.getValue(ServiceControllerImpl.java:1158) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
at org.jboss.as.patching.management.PatchResource$ElementProviderResourceProvider.children(PatchResource.java:139) [wildfly-patching-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.patching.management.PatchResource$ElementProviderResourceProvider.hasChildren(PatchResource.java:134) [wildfly-patching-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.controller.registry.AbstractModelResource.hasChildren(AbstractModelResource.java:81) [wildfly-controller-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.controller.registry.AbstractModelResource$DelegateResource.hasChildren(AbstractModelResource.java:279) [wildfly-controller-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:57) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.model.RootResourceIterator.iterate(RootResourceIterator.java:43) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.model.ModelControllerMBeanHelper.queryMBeans(ModelControllerMBeanHelper.java:125) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.model.ModelControllerMBeanServerPlugin.queryMBeans(ModelControllerMBeanServerPlugin.java:159) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.jmx.PluggableMBeanServerImpl.queryMBeans(PluggableMBeanServerImpl.java:816) [wildfly-jmx-8.1.0.Final.jar:8.1.0.Final]
at example.ShutdownMBeanQuery.destroy(ShutdownMBeanQuery.java:23)