Unable to access WS in J2EE way

[Hussein Baghdadi]

Hi all.
I want to access my Java web service from my JSP using JNDI.
my web services consists of the following files :
com.SearchPerson
com.SearchPerson_Impl
I deployed this web service in J2EE 1.4 without any problems.
I used wscompile tool to generate the static stubs, like :
sstub.SearchPerson
sstub.SearchPersonService
sstub.SearchPersonService_Impl.class
// other files goes here...
this is a snippet from web.xml file

<servlet>
  <display-name>SearchPerson_Impl</display-name>
  <servlet-name>SearchPerson_Impl</servlet-name>
  <servlet-class>com.sun.enterprise.webservice.JAXRPCServlet</servlet-class>
</servlet>
<service-ref>
  <service-ref-name>service/SearchPersonService</service-ref-name>
  <service-interface>sstub.SearchPersonService</service-interface>
  <wsdl-file>WEB-INF/wsdl/SearchPersonService.wsdl</wsdl-file>
  <jaxrpc-mapping-file>WEB-INF/mapping.xml</jaxrpc-mapping-file>
  <service-qname xmlns:service-qname_ns__="http://www.mydomain.com">
                      service-qname_ns__:SearchPersonService</service-qname>
</service-ref>

here is webservices.xml :

<display-name>SearchPersonService</display-name>
<webservice-description-name>SearchPersonService</webservice-description-name>
<wsdl-file>WEB-INF/wsdl/SearchPersonService.wsdl</wsdl-file>
<jaxrpc-mapping-file>WEB-INF/mapping.xml</jaxrpc-mapping-file>
<port-component>
  <display-name>SearchPerson</display-name>
  <port-component-name>SearchPerson</port-component-name>
  <wsdl-port xmlns:wsdl-port_ns__="http://www.mydomain.com/">wsdl-port_ns__:SearchPersonPort</wsdl-port>
  <service-endpoint-interface>com.SearchPerson</service-endpoint-interface>
  <service-impl-bean>
    <servlet-link>SearchPerson_Impl</servlet-link>
  </service-impl-bean>
</port-component>

in my JSP page I wrote (this JSP importing sstub package not com):

InitialContext jndiContext = new InitialContext();
sstub.SearchPersonService service = (sstub.SearchPersonService)jndiContext.lookup
                               ("java:comp/env/service/SearchPersonService");
sstub.SearchPerson ws = service.getSearchPersonPort( );
sstub.Person person = ws.getPersonByNumber(1);
out.write(person.getName( ));

when running the application, I got :
IllegalArgumentException: object is not an instance of declaring class
any ideas ?