unable to get JVMStats
I am running a stand-alone Java client code using JMX on Websphere App Server 6.0.2. It returns me null value for JVMStats object. The code is as follows. Please let me know what could be the problem.
Thanks,
Vishal
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import java.rmi.RemoteException;
import java.util.Properties;
import java.util.Set;
import javax.ejb.CreateException;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import javax.rmi.PortableRemoteObject;
import javax.management.j2ee.Management;
import javax.management.j2ee.ManagementHome;
import javax.management.j2ee.statistics.JVMStats;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
/**
* @author vopatel
*/
public class JVMEjbAdmin{
private ObjectName jvm;
Management mejb = null;
public static void main(String[] args) {
JVMEjbAdmin ace = new JVMEjbAdmin();
// Create an AdminClient
ace.createAdminClient();
// Find a NodeAgent MBean
ace.getJVMMBean();
}
private void createAdminClient() {
Properties props = new Properties();
props.setProperty(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory");
props.setProperty(Context.PROVIDER_URL, "iiop://localhost:2809");
Context ic = null;
try {
ic = new InitialContext(props);
} catch (NamingException e) {
e.printStackTrace();
}
Object obj = null;
try {
obj = ic.lookup("ejb/mgmt/MEJB");
System.out.println(" name = " + obj.getClass().getName());
System.out.println("obj = " + obj);
} catch (NamingException e1) {
e1.printStackTrace();
}
ManagementHome mejbHome = (ManagementHome)
PortableRemoteObject.narrow(obj, ManagementHome.class);
try {
mejb = mejbHome.create();
} catch (RemoteException e2) {
e2.printStackTrace();
} catch (CreateException e2) {
e2.printStackTrace();
}
System.out.println("Connected to DeploymentManager");
}
private void getJVMMBean() {
ObjectName jvmQuery = null;
try {
jvmQuery = new ObjectName("*:j2eeType=JVM,*");
} catch (MalformedObjectNameException e) {
e.printStackTrace();
}
Set s = null;
try {
s = mejb.queryNames(jvmQuery, null);
ObjectName jvmMBean = (ObjectName) s.iterator().next();
JVMStats stats = (JVMStats) mejb.getAttribute(jvmMBean,"stats");
System.out.println(" stats = " + stats);
//String[] statisticNames = stats.getStatisticNames();
} catch (AttributeNotFoundException e2) {
e2.printStackTrace();
} catch (InstanceNotFoundException e2) {
e2.printStackTrace();
} catch (MBeanException e2) {
e2.printStackTrace();
} catch (ReflectionException e2) {
e2.printStackTrace();
} catch (RemoteException e2) {
e2.printStackTrace();
}
}
}
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