NoClassDefFoundError running WS client

Hi all,
I'm developing a dynamix proxy client of a web service on Eclipse. I can compile the code without problems, but I get this error when executing the client:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/activation/DataHandler
     at com.sun.xml.rpc.encoding.soap.StandardSOAPTypeMappings.class$(StandardSOAPTypeMappings.java:138)
     at com.sun.xml.rpc.encoding.soap.StandardSOAPTypeMappings.<init>(StandardSOAPTypeMappings.java:891)
     at com.sun.xml.rpc.encoding.StandardTypeMappings.getSoap(StandardTypeMappings.java:32)
     at com.sun.xml.rpc.client.BasicService.createSoapMappings(BasicService.java:230)
     at com.sun.xml.rpc.client.BasicService.createStandardTypeMappingRegistry(BasicService.java:202)
     at com.sun.xml.rpc.client.BasicService.<init>(BasicService.java:79)
     at com.sun.xml.rpc.client.dii.ConfiguredService.<init>(ConfiguredService.java:52)
     at com.sun.xml.rpc.client.dii.ConfiguredService.<init>(ConfiguredService.java:48)
     at com.sun.xml.rpc.client.ServiceFactoryImpl.createService(ServiceFactoryImpl.java:41)
     at WSClient.Access.main(Access.java:33)
I have included jaxrpc and saaj jar files in the "Run As" menu, but the error appears when the program should execute this line:
Service WSService = serviceFactory.createService(WSClientWsdlUrl, new QName(nameSpaceUri, serviceName));
Any idea?
Many thanks everybody.

I found the response myself :-)
I'm using JWSDP 1.6. To solve the problem, I just included all the libraries contained in C:\Sun\jwsdp-1.6\jwsdp-shared\lib in the Run->Classpath menu and it worked.

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    import java.util.*;
    import javax.naming.Context;
    import javax.naming.InitialContext;
    import javax.rmi.PortableRemoteObject;
    public class TaxClient {
    public static void main(String[] args) {
    try {
    Context initial = new InitialContext();
    Object objRef = initial.lookup("MyTaxBean");
    TaxHome home = (TaxHome) PortableRemoteObject.narrow(objRef, TaxHome.class);
    Tax tax = null;
    tax = home.create("IL", 5.00f);
    tax = home.create("CA", 6.25f);
    tax = home.create("FL", 8.50f);
    tax = home.create("CO", 6.75f);
    tax = home.findByPrimaryKey("CA");
    System.out.println("CA tax rate: " + tax.getTaxRate());
    System.out.println("Changing tax rate for CA state");
    tax.setTaxRate(8.25f);
    System.out.println("New CA tax rate: " + tax.getTaxRate());
    Collection taxArray = home.findInRange(5.0f, 7.0f);
    Iterator it = taxArray.iterator();
    while (it.hasNext()) {
    Object objRef2 = it.next();
    tax = (Tax)PortableRemoteObject.narrow(objRef2, Tax.class);
    System.out.println("Tax Rate in " + tax.getPrimaryKey() + ": "
    + tax.getTaxRate());
    tax.remove();
    } catch (Exception ex) {
    System.err.println("Caught an exception.");
    ex.printStackTrace();
    anyone who know what is problem pls help. i'm using win2k, j2sdk 1.3.1_02 and j2ee1.3.1. thanks

    yeah its run. some problem with the deployer descriptor. but problem occured again when i try to run the client for the second time it throws exception:
    java.rmi.ServerException: RemoteException occurred in server thread; nested exce
    ption is:
    java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: O
    bject state could not be saved; nested exception is:
    javax.ejb.EJBException: Object state could not be saved
    java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Object st
    ate could not be saved; nested exception is:
    javax.ejb.EJBException: Object state could not be saved
    javax.ejb.EJBException: Object state could not be saved
    <<no stack trace available>>
    why it runs for the first time but not for the second?

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