NoClassDefFoundError when creating service stub

[Jack_Emmerichs]

I'm an Axis newby, so please pardon any obvious dumb mistakes I'm trying to find.

I'm trying to follow the example in the Axis User Guide for implementing the client side bindings.  I've created all the generated Java code from the service WSDL (using the Lavadora Eclipse plugin, but the code looks correct).  I'll generalize the names of the four interface class files as ServiceInterface, ServiceLocator, PortInterface, and PortStub.  This is all in one test project, so the client and server components are in different packages.

Using the User Guide example, I'm trying to execute the following code:

        ServiceInterface myService = new ServiceLocator();
        PortInterface MyPort = myService.getServerName();

The first line works fine.  The second line executes the portion of myService.getServerName() which creates the URL and than calls myService.getServerName(URL)  However, the line of code which essentially says:

        clientPackage.PortStub _stub = new clientPackag.PortStub(portAddress, this);

This line of code generates a  java.lang.NoClassDefFoundError exception, and won't tell me what the class is that is not found, and blows up in code that I don't have the source for

If I create my own Call object and use it directly, the service works just fine, so the problem is not the client, the service, Tomcat, Axis, or any other external items.  
I seem to have some sort of class definition (classpath?) error in creating the PortStub.  Anybody have any idea what this might be?

JFE.