Trouble Registering Custom MBean in WLS 6.1 (Example from JMX Guide)

Question

Hi there,
I have trouble getting an example to work provided in the BEA Manual
"Programming WebLogic JMX Services". The example of registering a
custom MBeans produces in my case:
java -cp .;C:\bea\wlserver6.1\lib\weblogic.jar jmx.dummy.MyClient
Getting BEA MBean Server
Using domain: weblogic
Create object name
Create MBean Dummy within MBean Server
Could not create MBean Dummy
java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException: jmx.dummy.MyClient
java.lang.ClassNotFoundException: jmx.dummy.MyClient
<<no stack trace available>>
--------------- nested within: ------------------
weblogic.rmi.extensions.RemoteRuntimeException - with nested
exception:
[java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
        java.lang.ClassNotFoundException: jmx.dummy.MyClient]
at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:60)
at $Proxy2.registerMBean(Unknown Source)
at jmx.dummy.MyClient.registerMBean(MyClient.java:57)
at jmx.dummy.MyClient.main(MyClient.java:19)
I have a custom MBean: MyCustomMBean:
package jmx.dummy;
public interface MyCustomMBean
public int      getAttribute();
and it's implementation class MyClient listed below. Does anybody know
what I'm doing wrong ?
Greetings,
Alex
package jmx.dummy;
import weblogic.management.MBeanHome;
import weblogic.management.Helper;
import weblogic.management.RemoteMBeanServer;
import javax.management.*;
public class MyClient implements MyCustomMBean, java.io.Serializable
MBeanServer server = null;
ObjectName mbo = null;
String mbeanName = null;
public static void main(String[] args)
MyClient client = new MyClient();
client.createMBeanServer();
client.registerMBean();
client.getMBeanInfo();
private void createMBeanServer()
MBeanHome mbh =
Helper.getMBeanHome("system","beabeabea","t3://localhost:7001","petstoreServer");
echo("Getting BEA MBean Server");
server = mbh.getMBeanServer();
if (server == null)
echo("Server is null");
System.exit(2);
private void registerMBean()
String domain = server.getDefaultDomain();
echo("Using domain: " + domain);
mbeanName = new String("Dummy");
try
echo("Create object name");
mbo = new ObjectName(domain + ":type="+mbeanName);
catch (MalformedObjectNameException e1)
echo("MalformedObjectNameException");
e1.printStackTrace();
System.exit(1);
echo("Create MBean " + mbeanName + " within MBean Server");
try
//server.createMBean(mbeanName,mbo);
server.registerMBean((Object) new MyClient(), mbo);
catch (Exception e)
echo("Could not create MBean " + mbeanName);
e.printStackTrace();
System.exit(1);
private void getMBeanInfo()
echo("getting management information for "+mbeanName);
MBeanInfo info = null;
try
info = server.getMBeanInfo(mbo);
catch (Exception e)
echo("could not get MBeanInfo object for "+mbeanName);
e.printStackTrace();
return;
echo("CLASSNAME: \t"+info.getClassName());
echo("DESCRIPTION: \t"+info.getDescription());
echo("ATTRIBUTES: todo ....");
echo("\n\n");
try
echo("Get MBean Values:");
String state = (String)
server.getAttribute(mbo,"MyAttribute");
catch (Exception e)
echo("Could not read attributes");
e.printStackTrace();
return;
echo("End of DEMO");
private void echo(String error)
System.out.println(error);
public int getAttribute()
return 3434;

Answer 1

Hi, i'm using wl 6.0 on HPunix.
And.. we don't have any serverclasses folder. :(
Audun
[email protected] (Alex) wrote:
OK, I got it working. Will answer it here in case somebody else has a
problem. Editing the CLASSPATH of WLS did not work for me but putting
my classes in ./config/serverclasses/ did the trick. But then I
encountered another problem, new exception that my code was not JMX
compliant. Seperating the MBean implementation for the MyClient class
to a new class worked:
new class MyCustom:
package jmx.dummy;
public class MyCustom implements
jmx.dummy.MyCustomMBean,java.io.Serializable
public int getMyAttribute()
return 3434;
untouched MyCustomMBean class:
package jmx.dummy;
public interface MyCustomMBean
public int      getMyAttribute();
edited MyClient class:
package jmx.dummy;
import weblogic.management.MBeanHome;
import weblogic.management.Helper;
import weblogic.management.RemoteMBeanServer;
import javax.management.*;
public class MyClient
MBeanServer server = null;
ObjectName mbo = null;
String mbeanName = null;
public static void main(String[] args)
MyClient client = new MyClient();
client.createMBeanServer();
client.registerMBean();
client.getMBeanInfo();
     client.unregister();
private void createMBeanServer()
MBeanHome mbh =
Helper.getMBeanHome("system","beabeabea","t3://localhost:7001","examplesServer");
echo("Getting BEA MBean Server");
server = mbh.getMBeanServer();
if (server == null)
echo("Server is null");
System.exit(2);
private void registerMBean()
String domain = server.getDefaultDomain();
echo("Using domain: " + domain);
mbeanName = new String("MyCustomMBean");
try
echo("Create object name");
mbo = new ObjectName(domain + ":type="+mbeanName);
catch (MalformedObjectNameException e1)
echo("MalformedObjectNameException");
e1.printStackTrace();
System.exit(1);
echo("Create MBean " + mbeanName + " within MBean Server");
try
//server.createMBean(mbeanName,mbo);
server.registerMBean((Object) new MyCustom(), mbo);
catch (Exception e)
echo("Could not create MBean " + mbeanName);
e.printStackTrace();
System.exit(1);
private void getMBeanInfo()
echo("getting management information for "+mbeanName);
MBeanInfo info = null;
try
info = server.getMBeanInfo(mbo);
catch (Exception e)
echo("could not get MBeanInfo object for "+mbeanName);
e.printStackTrace();
return;
echo("CLASSNAME: \t"+info.getClassName());
echo("DESCRIPTION: \t"+info.getDescription());
echo("ATTRIBUTES: todo ....");
echo("\n\n");
try
echo("Get MBean Values:");
String state =
(server.getAttribute(mbo,"MyAttribute")).toString();
System.out.println("state is "+state);
catch (Exception e)
echo("Could not read attributes");
e.printStackTrace();
return;
echo("End of DEMO");
private void echo(String error)
System.out.println(error);
public int getAttribute()
return 3434;
private void unregister()
try
server.unregisterMBean(mbo);
catch (Exception e)
echo("could not unregister mbean");
[email protected] (Alex) wrote in message news:<[email protected]>...
Hi there,
I have trouble getting an example to work provided in the BEA Manual
"Programming WebLogic JMX Services". The example of registering a
custom MBeans produces in my case:
java -cp .;C:\bea\wlserver6.1\lib\weblogic.jar jmx.dummy.MyClient
Getting BEA MBean Server
Using domain: weblogic
Create object name
Create MBean Dummy within MBean Server
Could not create MBean Dummy
java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException: jmx.dummy.MyClient
java.lang.ClassNotFoundException: jmx.dummy.MyClient
<<no stack trace available>>
--------------- nested within: ------------------
weblogic.rmi.extensions.RemoteRuntimeException - with nested
exception:
[java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException: jmx.dummy.MyClient]
at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:60)
at $Proxy2.registerMBean(Unknown Source)
at jmx.dummy.MyClient.registerMBean(MyClient.java:57)
at jmx.dummy.MyClient.main(MyClient.java:19)
I have a custom MBean: MyCustomMBean:
package jmx.dummy;
public interface MyCustomMBean
public int      getAttribute();
and it's implementation class MyClient listed below. Does anybody know
what I'm doing wrong ?
Greetings,
Alex
package jmx.dummy;
import weblogic.management.MBeanHome;
import weblogic.management.Helper;
import weblogic.management.RemoteMBeanServer;
import javax.management.*;
public class MyClient implements MyCustomMBean, java.io.Serializable
MBeanServer server = null;
ObjectName mbo = null;
String mbeanName = null;
public static void main(String[] args)
MyClient client = new MyClient();
client.createMBeanServer();
client.registerMBean();
client.getMBeanInfo();
private void createMBeanServer()
MBeanHome mbh =
Helper.getMBeanHome("system","beabeabea","t3://localhost:7001","petstoreServer");
echo("Getting BEA MBean Server");
server = mbh.getMBeanServer();
if (server == null)
echo("Server is null");
System.exit(2);
private void registerMBean()
String domain = server.getDefaultDomain();
echo("Using domain: " + domain);
mbeanName = new String("Dummy");
try
echo("Create object name");
mbo = new ObjectName(domain + ":type="+mbeanName);
catch (MalformedObjectNameException e1)
echo("MalformedObjectNameException");
e1.printStackTrace();
System.exit(1);
echo("Create MBean " + mbeanName + " within MBean Server");
try
//server.createMBean(mbeanName,mbo);
server.registerMBean((Object) new MyClient(), mbo);
catch (Exception e)
echo("Could not create MBean " + mbeanName);
e.printStackTrace();
System.exit(1);
private void getMBeanInfo()
echo("getting management information for "+mbeanName);
MBeanInfo info = null;
try
info = server.getMBeanInfo(mbo);
catch (Exception e)
echo("could not get MBeanInfo object for "+mbeanName);
e.printStackTrace();
return;
echo("CLASSNAME: \t"+info.getClassName());
echo("DESCRIPTION: \t"+info.getDescription());
echo("ATTRIBUTES: todo ....");
echo("\n\n");
try
echo("Get MBean Values:");
String state = (String)
server.getAttribute(mbo,"MyAttribute");
catch (Exception e)
echo("Could not read attributes");
e.printStackTrace();
return;
echo("End of DEMO");
private void echo(String error)
System.out.println(error);
public int getAttribute()
return 3434;