How to configure Apache ODE & Jar & ExtensionAcitivy of WS-BPEL Extensions

Hi Guys
I am working on a BPEL process using Apache ODE and ExtensionActivity of WS-BPEL Extensions.
So there are a BPEL process ExtensionActivity.bpel and two java file

so ExtensionActivity.bpel

<assign name="assign1">
         <copy>
            <from variable="myVar" part="TestPart"/>
            <to variable="tmpVar"/>
         </copy>
         <copy>
             <from>concat($tmpVar,' World')</from>
             <to variable="myVar" part="TestPart"/>
         </copy>
      </assign>
	  <flow>

</flow>
       <reply name="end"  
              partnerLink="helloPartnerLink"
              portType="test:HelloPortType" 
              operation="hello"
              variable="myVar"/>
   </sequence>
</process>

and B4PExtensionBundle.java

package org.wso2.bps.samples.extension;

import java.io.File;
import java.io.IOException;

import org.apache.ode.bpel.rtrep.common.extension.AbstractExtensionBundle;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Created by IntelliJ IDEA.
 * User: waruna
 * Date: Oct 19, 2009
 * Time: 9:45:09 AM
 * To change this template use File | Settings | File Templates.
 */
public class B4PExtensionBundle extends AbstractExtensionBundle {
    protected final Log log = LogFactory.getLog(getClass());
    public static final String NS = "http://ode.apache.org/extensions/b4p";

public String getNamespaceURI() {
        return NS;
        
    }

public void registerExtensionActivities() {
        log.info("Registering B4PExtensionBundle.");
        String file = "file.txt";
        File f = new File("D://", file);
        f.getParentFile().mkdirs();
        try{
            f.createNewFile();
        } catch(IOException e){
            e.printStackTrace();
        }
       
        
        registerExtensionOperation("b4ptest", B4PExtensionOperation.class);
    }
}

ExtensionOperation.java

package org.wso2.bps.samples.extension;

import java.io.File;
import java.io.IOException;

import org.w3c.dom.Element;
import org.apache.ode.bpel.rtrep.common.extension.ExtensionContext;
import org.apache.ode.bpel.extension.ExtensionOperation;
import org.apache.ode.bpel.common.FaultException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Created by IntelliJ IDEA.
 * User: waruna
 * Date: Oct 19, 2009
 * Time: 9:45:35 AM
 * To change this template use File | Settings | File Templates.
 */
public class B4PExtensionOperation implements ExtensionOperation {
    protected final Log log = LogFactory.getLog(getClass());

public void run(Object o, Element element) throws FaultException {
        log.info("Executing \"b4ptest\" activity");
        
        ExtensionContext tempEC = (ExtensionContext) o;
        ((ExtensionContext)o).complete();         //complete the activity
        /* //To complete with a fault
        Exception e = new Exception("Test Exception for the Extension activity");
        ((ExtensionContext)o).completeWithFault(e);                              */
       
        
        String file = "file.txt";
        File f = new File("D://", file);
        f.getParentFile().mkdirs();
        try{
            f.createNewFile();
        } catch(IOException e){
            e.printStackTrace();
        }
    }
}

I try to do Installation of extensions (WAR - Axis2 deployable)
Transform two java to a jar and copy the extension jar to /WEB-INF/lib.
Register the extension. Open /WEB-INF/conf/ode-axis2.properties and add the following lines:

ode-axis2.extension.bundles.runtime = org.wso2.bps.samples.extension.B4PExtensionBundle
Start/Restart Apache ODE

In fact , the BPEL process can be executed successfully but the jar seem not be invoked.
how can i do and debug?
Could you give me some suggestion?

Thanks.
Alan