Client in a servlet does not work

[trella]

Hello, I have a web service called getLastConcept() in a Java class 
called GestorModeloAlumno.java. I built a dinamyc client 
(ConnectionManager.java) with wsif and it worked. The client was loaded 
from an applet, then I decided to built the client in a servlet, so the 
applet call a ConnectionManagerServlet that call to the getLastConcept() 
web service and return the result to the applet. The method in the 
servlet that call to the service is the one listed below. The error when 
executing is:
could not load 
http://castor.lcc.uma.es/medea/servicioweb/GestorModeloAlumno.wsdl; 
nested exception is:
   WSDLException: faultCode=CONFIGURATION_ERROR: Problem instantiating 
factory implementation.: org.apache.wsif.wsdl.WSIFWSDLFactoryImpl: 
java.lang.ClassNotFoundException: org.apache.wsif.wsdl.WSIFWSDLFactoryImpl
   at 
org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:992)
   at 
org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:857)
   at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:140)
   at javax.wsdl.factory.WSDLFactory.newInstance(Unknown Source)
   at org.apache.wsif.util.WSIFUtils.readWSDL(Unknown Source)
   at org.apache.wsif.base.WSIFServiceImpl.<init>(Unknown Source)
   at org.apache.wsif.base.WSIFServiceFactoryImpl.getService(Unknown 
Source)
   at connectionmanager.ConnectionManagerServlet.getLastConcept
    ......
I have tried the wsdl file url from the navigator and it's fine. Thank 
you in advanced for your help.

       M�nica Trella.

public String getLastConcept(String idStudent, String idCourse){
     String concepto = null;
     try {
       WSIFServiceFactory factory = WSIFServiceFactory.newInstance();
       WSIFService fieldService =  factory.getService(
                         ConfigMedea.URL_WSDL_GESTOR_MODELO_ALUMNO,
                         null,
                         null,
                         null,
                         null);
       WSIFPort port = fieldService.getPort();
       // create the operation
       WSIFOperation operation = port.createOperation("getLastConcept");
       // create the input, output and fault messages associated with 
this operation
       WSIFMessage input = operation.createInputMessage();
       WSIFMessage output = operation.createOutputMessage();
       WSIFMessage fault = operation.createFaultMessage();

       input.setObjectPart("in0", idStudent);
       input.setObjectPart("in1", idCourse);
       if (operation.executeRequestResponseOperation(input , output , 
fault )) {

          concepto = (String) output.getObjectPart("getLastConceptReturn");
       } else{
             if (Debug.DEBUG_LEVEL >= ConfigMedea.DEBUG_LEVEL_1)
               Debug.println("[ERROR]: 
connectionmanager.ConnectionManagerServlet.getLastConcept(String, 
String) :: La operacion de peticion de la ejecucion del servicio ha sido 
fallida. " + fault.toString(), Debug.DEBUG_MEDEA);

             return null;

       }//End if 
(operation_prueba.executeRequestResponseOperation(input_prueba , 
output_prueba , fault_prueba ))
   } catch (Exception e) {
           if (Debug.DEBUG_LEVEL >= ConfigMedea.DEBUG_LEVEL_1)
                   Debug.println("[ERROR]: 
connectionmanager.ConnectionManagerServlet.getLastConcept(String, 
String) :: " + e.getMessage(), Debug.DEBUG_MEDEA);
           return null;
   }//End try-catch
   return concepto;
 }//End getLastConcept