When jboss is shutdown MainDeployer.shutdown() iterates over the list of deployments in reverse order and undeploys them.

deploy-hasingleton gets undeployed first, but then while deploy-hasingleton-service.xml gets undeployed it triggers a second undeploy of deploy-hasingleton which logs a WARNing:

20:50:28,325 WARN [MainDeployer] undeploy 'file:/X:/jboss/jboss-4.0.4.GA/server/all//deploy-hasingleton' : package not deployed