[jboss-as7-dev] Problems with HA singleton service on JBoss 7.1.1

[IK81]

Dear all,

I've been playing around with the HA singleton service of JBoss AS7. I 
took the example in 
https://access.redhat.com/site/documentation/en-US/JBoss_Enterprise_Application_Platform/6/html/Development_Guide/Implement_an_HA_Singleton.html 
as a basis and use a EJB Singleton to start and stop the HA singleton 
service.

Starting the service works fine, I also tested the fail-over behaviour 
between different nodes. However, I encountered some strange behaviour 
when it is up to stop the service:

- When I shutdown the server, the service is properly stopped and the 
corresponding method stop() method is executed
- When I undeploy the app the PreDestroy method of the EJB singleton is 
executed and I try to stop the HA singleton service as in the example. 
However, it seems that the service is already in the REMOVED state and 
unfortunately, the stop method of the singleton service is never 
executed. So I have no possibility to clean up the resources that are 
claimed by the service (TCP socket connection). This is not the 
behaviour I'd expect

The code of the EJB singleton for service starting/stopping is as 
follows:

@Singleton
@Startup
public class ServiceInstaller {

     private static final Logger LOGGER = 
LoggerFactory.getLogger(ServiceInstaller.class);

     @PostConstruct
     public void init() {
         LOGGER.info("Starting singleton");

         SimpleService service = new SimpleService();
         SingletonService<String> singleton = new 
SingletonService<String>(service, SimpleService.SINGLETON_SERVICE_NAME);
         ServiceController<String> controller = 
singleton.build(CurrentServiceContainer.getServiceContainer())
             .addDependency(ServerEnvironmentService.SERVICE_NAME, 
ServerEnvironment.class, service.getEnvInjector())
             .install();

         ServiceListener<String> listener = new 
NotifyingServiceListener<String>();
         controller.addListener(listener);
         controller.setMode(ServiceController.Mode.ACTIVE);

         LOGGER.info("Singleton started");
     }

     @PreDestroy
     public void destroy() {
         LOGGER.info("Destroying singleton");

         ServiceController<?> controller = 
CurrentServiceContainer.getServiceContainer().getRequiredService(SimpleService.SINGLETON_SERVICE_NAME);
         controller.setMode(ServiceController.Mode.REMOVE);

         LOGGER.info("Singleton destroyed");
     }

     private static class NotifyingServiceListener<T> extends 
AbstractServiceListener<T> {
         @Override
         public void transition(ServiceController<? extends T> 
controller, Transition transition) {
             LOGGER.info("Change state from " + 
transition.getBefore().toString() + " to " + 
transition.getAfter().toString());
         }
       }
}


I've tested this using JBoss 7.1.1 and the standalone-ha.xml 
configuration.

Another weird issue is that, if I redeploy the app after I've deployed 
it, the deployment fails. The log shows me that the service with the 
same name is already registered. However, I have not found a possibility 
to unregister such a service.

Any suggestions? Is this a bug in JBoss?

Thanks,
Ingo