Hi, I deployed a MBean which implements the HASingleton in a clusterd JBoss application. I use it to manage a HashMap userd to read/store user infos. I followed the instructions found here:

http://www.jboss.org/index.html?module=bb&op=viewtopic&t=55794

So I think the configuration is fine, because trying the service on a single-server cluster it works fine. Problems arise when I start a 2nd server. The MBean definition follows:

public class LicenseSingletonService extends ServiceMBeanSupport implements
 LicenseSingletonServiceMBean
{
 private Map sessions;

 public LicenseSingletonService()
 {
 sessions = new HashMap();
 }

 public Map getUserSessions()
 {
 return sessions;
 }

 public void setUserSessions(Map sessions)
 {
 this.sessions = sessions;
 }

 public void startSingleton()
 {
 }

 public void stopSingleton()
 {
 }

}

The MBean is invoked inside a Valve, which intercepts user requests and stores session infos in a HashMap:

public class LicenseRequirementsValve extends ValveBase
{

 private MBeanServerConnection singletonService;

 private Map sessions;

 ........

The adaptor is initiallized in the LicenseRequirementsValve constructor:

public LicenseRequirementsValve() throws Exception
{
 // initialize the singleton service
 Hashtable jndiProperties = new Hashtable();
 jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY,
 "org.jnp.interfaces.NamingContextFactory");
 jndiProperties.put(Context.PROVIDER_URL, "localhost:1100");
 jndiProperties.put("java.naming.factory.url.pkgs",
 "org.jboss.naming:org.jnp.interfaces");
 Context context = new InitialContext(jndiProperties);
 this.singletonService = (MBeanServerConnection) context.lookup("jmx/invoker/SingletonRMIAdaptor");
 if ((singletonService != null)
 && (singletonService.isRegistered(new ObjectName(
 "licenseSingletonService.mbean:service=LicenseSingletonService"))))
 {
 LogHelper.logMessage("Singleton service found");
 }
 .........

The map is read/written by means of the LicenseRequirementsValve methods:

private Map getSessionsFromRemoteSingleton() throws ReflectionException,
 InstanceNotFoundException, MBeanException, IOException, MalformedObjectNameException
{
 Map sMap = (Map) singletonService.invoke(new ObjectName(
 "licenseSingletonService.mbean:service=LicenseSingletonService"),
 "getUserSessions", new Object[0], new String[0]);
 return sMap;
}

and

private void updateSessionsToRemoteSingleton() throws ReflectionException,
 InstanceNotFoundException, MBeanException, IOException, MalformedObjectNameException
{
 singletonService.invoke(new ObjectName("licenseSingletonService.mbean:service=LicenseSingletonService"),
 "setUserSessions", new Object[] { this.sessions },
 new String[] { "java.util.HashMap" });
}

The exception is thrown calling the latest:

09:50:06,898 ERROR [ROM] [USER: claves] java.rmi.MarshalException: error marshalling arguments; nested exception is:
 java.io.NotSerializableException: com.bitaplus.bitastar.web.valve.LicenseRequirementsValve
 at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:129)
 at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
 at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:118)
 at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:227)
 at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:167)
 at org.jboss.jmx.connector.invoker.client.InvokerAdaptorClientInterceptor.invoke(InvokerAdaptorClientInterceptor
.java:51)
 at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
 at org.jboss.proxy.ClientMethodInterceptor.invoke(ClientMethodInterceptor.java:59)
 at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
 at $Proxy51.invoke(Unknown Source)
 at com.ciccio.pasticcio.web.valve.LicenseRequirementsValve.updateSessionsToRemoteSingleton(LicenseRequirementsV
alve.java:211)
 at com.ciccio.pasticcio.web.valve.LicenseRequirementsValve.invoke(LicenseRequirementsValve.java:416)
 at com.ciccio.pasticcio.web.valve.LoginErrorMessageValve.invoke(LoginErrorMessageValve.java:33)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)

I really can't see where is my mistake. Can you help me, please?

TREMALNAIK