Problème mbeans jmx

j'utilise jdevloper 11g
Dans l’exécution de mon programme j’ai les erreurs suivants :
Create an RMI connector client and connect it to the RMI connector server
java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.NameNotFoundException: server
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:323)
at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:248)
at pack.Client.main(Client.java:25)
Caused by: javax.naming.NameNotFoundException: server
at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:99)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:185)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1871)
at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1841)
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:257)
... 2 more
Process exited with exit code 0.

et voici mon class :

package pack;

import java.io.IOException;
import java.util.Iterator;
import java.util.Set;
import javax.management.Attribute;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerInvocationHandler;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

public class Client {

public static void main(String[] args) {
try {
// Create an RMI connector client and
// connect it to the RMI connector server
//
echo("\nCreate an RMI connector client and " +
"connect it to the RMI connector server");
JMXServiceURL url = new JMXServiceURL(
"service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/server");
JMXConnector jmxc = JMXConnectorFactory.connect(url, null);

// Create listener
//
ClientListener listener = new ClientListener();

// Get an MBeanServerConnection
//
echo("\nGet an MBeanServerConnection");
MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
waitForEnterPressed();

// Get domains from MBeanServer
//
echo("\nDomains:");
String domains[] = mbsc.getDomains();
for (int i = 0; i < domains.length; i++) {
echo("\tDomain[" + i + "] = " + domains[i]);
}
waitForEnterPressed();

// Get MBeanServer's default domain
//
String domain = mbsc.getDefaultDomain();

// Create SimpleStandard MBean
//
ObjectName stdMBeanName =
new ObjectName(domain +":type=SimpleStandard,index=2");
echo("\nCreate SimpleStandard MBean...");
mbsc.createMBean("SimpleStandard", stdMBeanName, null, null);
waitForEnterPressed();

// Create SimpleDynamic MBean
//
ObjectName dynMBeanName =
new ObjectName(domain +":type=SimpleDynamic,index=2");
echo("\nCreate SimpleDynamic MBean...");
mbsc.createMBean("SimpleDynamic", dynMBeanName, null, null);
waitForEnterPressed();

// Get MBean count
//
echo("\nMBean count = " + mbsc.getMBeanCount());

// Query MBean names
//
echo("\nQuery MBeanServer MBeans:");
Set names = mbsc.queryNames(null, null);
for (Iterator i = names.iterator(); i.hasNext(); ) {
echo("\tObjectName = " + (ObjectName) i.next());
}
waitForEnterPressed();

// -------------------------------
// Manage the SimpleStandard MBean
// -------------------------------
echo("\n>>> Perform operations on SimpleStandard MBean <<<");

// Get State attribute in SimpleStandard MBean
//
echo("\nState = " + mbsc.getAttribute(stdMBeanName, "State"));

// Set State attribute in SimpleStandard MBean
//
mbsc.setAttribute(stdMBeanName,
new Attribute("State", "changed state"));

// Get State attribute in SimpleStandard MBean
//
// Another way of interacting with a given MBean is through a
// dedicated proxy instead of going directly through the MBean
// server connection
//
SimpleStandardMBean proxy = (SimpleStandardMBean)
MBeanServerInvocationHandler.newProxyInstance(
mbsc,
stdMBeanName,
SimpleStandardMBean.class,
true);
echo("\nState = " + proxy.getState());

// Add notification listener on SimpleStandard MBean
//
echo("\nAdd notification listener...");
mbsc.addNotificationListener(stdMBeanName, listener, null, null);

// Invoke "reset" in SimpleStandard MBean
//
// Calling "reset" makes the SimpleStandard MBean emit a
// notification that will be received by the registered
// ClientListener.
//
echo("\nInvoke reset() in SimpleStandard MBean...");
mbsc.invoke(stdMBeanName, "reset", null, null);

// Sleep for 2 seconds in order to have time to receive the
// notification before removing the notification listener.
//
echo("\nWaiting for notification...");
sleep(2000);

// Remove notification listener on SimpleStandard MBean
//
echo("\nRemove notification listener...");
mbsc.removeNotificationListener(stdMBeanName, listener);

// Unregister SimpleStandard MBean
//
echo("\nUnregister SimpleStandard MBean...");
mbsc.unregisterMBean(stdMBeanName);
waitForEnterPressed();

// ------------------------------
// Manage the SimpleDynamic MBean
// ------------------------------
echo("\n>>> Perform operations on SimpleDynamic MBean <<<");

// Get State attribute in SimpleDynamic MBean
//
echo("\nState = " + mbsc.getAttribute(dynMBeanName, "State"));

// Set State attribute in SimpleDynamic MBean
//
mbsc.setAttribute(dynMBeanName,
new Attribute("State", "changed state"));

// Get State attribute in SimpleDynamic MBean
//
echo("\nState = " +
mbsc.getAttribute(dynMBeanName, "State"));

// Add notification listener on SimpleDynamic MBean
//
echo("\nAdd notification listener...");
mbsc.addNotificationListener(dynMBeanName, listener, null, null);

// Invoke "reset" in SimpleDynamic MBean
//
// Calling "reset" makes the SimpleDynamic MBean emit a
// notification that will be received by the registered
// ClientListener.
//
echo("\nInvoke reset() in SimpleDynamic MBean...");
mbsc.invoke(dynMBeanName, "reset", null, null);

// Sleep for 2 seconds in order to have time to receive the
// notification before removing the notification listener.
//
echo("\nWaiting for notification...");
sleep(2000);

// Remove notification listener on SimpleDynamic MBean
//
echo("\nRemove notification listener...");
mbsc.removeNotificationListener(dynMBeanName, listener);

// Unregister SimpleDynamic MBean
//
echo("\nUnregister SimpleDynamic MBean...");
mbsc.unregisterMBean(dynMBeanName);
waitForEnterPressed();

// Close MBeanServer connection
//
echo("\nClose the connection to the server");
jmxc.close();
echo("\nBye! Bye!");
} catch (Exception e) {
e.printStackTrace();
}
}

private static void echo(String msg) {
System.out.println(msg);
}

private static void sleep(int millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

private static void waitForEnterPressed() {
try {
echo("\nPress <Enter> to continue...");
System.in.read();
} catch (IOException e) {
e.printStackTrace();
}
}
}