fine grained security with SubjectTrackingMBeanServer example

I'm trying to do fine grained security using a JMXAuthenticator, and an
MBeanServerForwarder as in the mx4j SubjectTrackingMBeanServer example. It
seems to work fine when I do an mBeanServerConnection.createMBean() call,
but not when I do a mBeanServerConnection.addNotificationListener() call. I
do both calls in one method of a unit test. I can see in
SubjectTrackingMBeanServer that the Subject is set properly for the
createMBean() call, but Subject is null for the addNotificationListener call
(causing the trace below).

Here's how I start the server:

        JMXServiceURL url = new
JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:9999/server");

        Map<String, JMXAuthenticator> environment = new HashMap<String,
JMXAuthenticator>();
        JMXAuthenticator authenticator = new MyAuthenticator();
        environment.put(JMXConnectorServer.AUTHENTICATOR, authenticator);
        MBeanServer server =
MBeanServerFactory.createMBeanServer("remote.security");
        cntorServer = JMXConnectorServerFactory.newJMXConnectorServer(url,
environment, server);
        ObjectName cntorServerName = ObjectName.getInstance(":service=" +
JMXConnectorServer.class.getName() + ",protocol=" + url.getProtocol());

        server.registerMBean(cntorServer, cntorServerName);
        NamingService naming = new NamingService();
        ObjectName namingName = ObjectName.getInstance(":service=" +
NamingService.class.getName());
        server.registerMBean(naming, namingName);
        naming.start();
        
        SubjectTrackingMBeanServer interceptor = new
SubjectTrackingMBeanServer();
        cntorServer.setMBeanServerForwarder(interceptor);
        cntorServer.start();

Here's starting the client:

	JMXServiceURL url = new
JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:9999/server");

	Map<String, String[]> environment = new HashMap<String, String[]>();
	String[] credentials = new String[]{"user", "password"};
	environment.put(JMXConnector.CREDENTIALS, credentials);		
	JMXConnector connector = JMXConnectorFactory.newJMXConnector(url,
null);
	connector.connect(environment);
	MBeanServerConnection connection =
connector.getMBeanServerConnection();				
	Object[] params = new Object[1];
	params[0] = object3;
	String[] sig = new String[1];
	sig[0] = "com.intersperse.objectmodel.ManagedObject";
	connection.createMBean(ManagedObjectMBean.class.getName(),
ObjectName.getInstance(obj3Name), params, sig);
	.
	.
	.
	connection.addNotificationListener(ObjectName.getInstance(obj3Name),
new NotificationListener() {
				public void
handleNotification(javax.management.Notification notification, Object
handback) {
					// TODO Auto-generated method stub

				}
			}, null, null);


The stack trace:

java.lang.IllegalArgumentException: Can't add listener to MBean server
delegate: java.lang.NullPointerException
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.createListeners(ArrayNot
ificationBuffer.java:531)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.<init>(ArrayNotification
Buffer.java:153)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.getNotificationBuffer(Ar
rayNotificationBuffer.java:64)
	at
javax.management.remote.rmi.RMIServerImpl.getNotifBuffer(RMIServerImpl.java:
495)
	at
javax.management.remote.rmi.RMIConnectionImpl.getServerNotifFwd(RMIConnectio
nImpl.java:148)
	at
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.
java:1444)
	at
javax.management.remote.rmi.RMIConnectionImpl.access$100(RMIConnectionImpl.j
ava:81)
	at
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMICon
nectionImpl.java:1245)
	at java.security.AccessController.doPrivileged(Native Method)
	at
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConne
ctionImpl.java:1348)
	at
javax.management.remote.rmi.RMIConnectionImpl.addNotificationListeners(RMICo
nnectionImpl.java:956)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at
sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
	at sun.rmi.transport.Transport$1.run(Transport.java:153)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
	at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:7
01)
	at java.lang.Thread.run(Thread.java:595)
	at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteC
all.java:247)
	at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
	at com.sun.jmx.remote.internal.PRef.invoke(Unknown Source)
	at
javax.management.remote.rmi.RMIConnectionImpl_Stub.addNotificationListeners(
Unknown Source)
	at
javax.management.remote.rmi.RMIConnector.addListenersWithSubjects(RMIConnect
or.java:546)
	at
javax.management.remote.rmi.RMIConnector.addListenerWithSubject(RMIConnector
.java:521)
	at
javax.management.remote.rmi.RMIConnector.access$700(RMIConnector.java:119)
	at
javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.addNoti
ficationListener(RMIConnector.java:1181)
	at
com.intersperse.clientjmx.mbeanserver.SubjectTrackingMBeanServerIntegrationT
est.testAddNotificationListener1(SubjectTrackingMBeanServerIntegrationTest.j
ava:217)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at junit.framework.TestCase.runTest(TestCase.java:154)
	at junit.framework.TestCase.runBare(TestCase.java:127)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:118)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:478)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.
java:344)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner
.java:196)
Caused by: java.lang.NullPointerException
	at
com.intersperse.clientjmx.mbeanserver.SubjectTrackingMBeanServer.getUserID(S
ubjectTrackingMBeanServer.java:73)
	at
com.intersperse.clientjmx.mbeanserver.SubjectTrackingMBeanServer.canAccess(S
ubjectTrackingMBeanServer.java:82)
	at
com.intersperse.clientjmx.mbeanserver.SubjectTrackingMBeanServer.addNotifica
tionListener(SubjectTrackingMBeanServer.java:92)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer$1.run(ArrayNotificationB
uffer.java:584)
	at java.security.AccessController.doPrivileged(Native Method)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.addNotificationListener(
ArrayNotificationBuffer.java:582)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.createListeners(ArrayNot
ificationBuffer.java:526)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.<init>(ArrayNotification
Buffer.java:153)
	at
com.sun.jmx.remote.internal.ArrayNotificationBuffer.getNotificationBuffer(Ar
rayNotificationBuffer.java:64)
	at
javax.management.remote.rmi.RMIServerImpl.getNotifBuffer(RMIServerImpl.java:
495)
	at
javax.management.remote.rmi.RMIConnectionImpl.getServerNotifFwd(RMIConnectio
nImpl.java:148)
	at
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.
java:1444)
	at
javax.management.remote.rmi.RMIConnectionImpl.access$100(RMIConnectionImpl.j
ava:81)
	at
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMICon
nectionImpl.java:1245)
	at java.security.AccessController.doPrivileged(Native Method)
	at
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConne
ctionImpl.java:1348)
	at
javax.management.remote.rmi.RMIConnectionImpl.addNotificationListeners(RMICo
nnectionImpl.java:956)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at
sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
	at sun.rmi.transport.Transport$1.run(Transport.java:153)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
	at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:7
01)
	at java.lang.Thread.run(Thread.java:595)



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