JBoss AS on shutdown (or even undeploy of applications) logs these WARN messages:

16:26:16,671 WARN [ClassLoading] Exception unregistering module, registry: org.jboss.classpool.plugins.jbosscl.RegisterModuleCallback@1762fc7,
cause: java.lang.IllegalStateException: Module VFSDeploymentClassLoaderPolicyModule juddi-service.sar:0.0.0 is not registered
16:26:16,672 WARN [ClassLoading] Exception unregistering module, registry: org.jboss.classpool.plugins.jbosscl.RegisterModuleCallback@1762fc7, cause: java.lang.IllegalStateException: Module VFSDeploymentClassLoaderPolicyModule jsr88-service.xml:0.0.0 is not registered
16:26:16,673 WARN [ClassLoading] Exception unregistering module, registry: org.jboss.classpool.plugins.jbosscl.RegisterModuleCallback@1762fc7,cause: java.lang.IllegalStateException: Module
VFSDeploymentClassLoaderPolicyModule jgroups-channelfactory.sar:0.0.0 is not registered

Either these should be logged at a lower level or the root cause needs to be fixed.