In order to reproduce this issue:

- Create an empty EJB project (NetBeans 6.0, glassfish v2u1).
- Add two Entity classes, "Document" and "Keyword" (persistence "TopLink" using jdbc/__default)
- Edit "Document" to contain a @OneToMany Collection<Keyword>.
- Create two "Session Beans for Entity Classes" for both "Document" and "Keyword".
- Create two web services and choose "Create Web Service from existing sesion bean" for both "DocumentFacade"
("DocumentSOAP") and "KeywordFacade" ("KeywordSOAP").
- Deploy the project to glassfish, move to the glassfish admin console, "Web Services" and copy the WSDL URL for
"DocumentSOAP".
- Create an empty java project.
- Create a new "web service client", choose "WSDL URL" and paste the URL copied from glassfish admin.
- Make the IDE create the web service.
- Move to the "DocumentSOAPPort" in "Web Service References" and drag the "create" method to the "Main" class of the
java project.

This code reproducibly (two different machines, two different installments of netbeans) will be inserted:

[01]        try { // Call Web Service Operation
[02]            demo.documents.client.DocumentSOAPService service = new demo.documents.client.DocumentSOAPService();
[03]            demo.documents.client.DocumentSOAP port = service.getDocumentSOAPPort();
[04]            // TODO initialize WS operation arguments here
[05]
[06]            demo.documents.client.Keyword arg0 = null;
[07]
[08]            port.create(arg0);
[09]
[10]        } catch (Exception ex) {
[11]            // TODO handle custom exceptions here
[12]        }

Line 6 .. 8: The service is supposed to create(Document arg0) rather than create(Keyword arg0). The client generated
does obviously not represent the DocumentFacade exposed by the web service...

@Local
public interface DocumentFacadeLocal {

    void create(Document document);


... or the web service definition according to the IDE:

@WebService()
@Stateless()
public class DocumentSOAP {
    @EJB
    private DocumentFacadeLocal ejbRef;
    // Add business logic below. (Right-click in editor and choose
    // "Web Service > Add Operation"

    @WebMethod(operationName = "create")
    @Oneway
    public void create(Document document) {
        ejbRef.create(document);
    }



Demo-Projects "demo.documents" (EJB) and "demo.documents.client" (Java) attached.

- Create a Web Service Client