Hi everybody,
I'm using Spring in a J2EE application and I get the following error:

ERROR 181625 10:55:09,750 controller.SISComboController error.134  - doService - eccezione view - java.lang.reflect.InvocationTargetException

[23/07/09 10.56.19:875 CEST] 00000045 ServletWrappe E   SRVE0068E: Impossibile richiamare il metodo service() per il servlet SISComboController. Eccezione generata : java.lang.NullPointerException
     at it.icg.sis.view.controller.SISComboController.doService(SISComboController.java:55)
     at com.sysdat.servlet.SysdatHttpServlet.doGet(SysdatHttpServlet.java:57)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1212)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:629)
     at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:2837)
     at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:220)
     at com.ibm.ws.webcontainer.VirtualHost.handleRequest(VirtualHost.java:204)
     at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1681)
     at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:77)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:421)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:367)
     at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:94)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:548)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:601)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:934)
     at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1021)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1332)

This is part of the file SISComboController.java:

               try {
                    SISSuggestObj sisObj = new SISSuggestObj();
                    sisObj.req = req;

                    Object[] parObj   = {sisObj};
                    Class[]  parClass = {sisObj.getClass()};
                    
                    SISComboViewHelper sisDojoObject = new SISComboViewHelper();
                    
                    Method method_ = sisDojoObject.getClass().getMethod("carica"+dataCombo+"Combo", parClass );

                    jSONObject = (JSONObject)method_.invoke(sisDojoObject, parObj );                    
      
               } catch (Exception e) {
                    Log.getInstance().error(this.getClass().getName(), "doService - eccezione view - "+e.toString());
               }

The metodo I'm calling is:

     public JSONObject caricaGaranzieCombo(SISSuggestObj sisObj){
          JSONObject jSONObject = null;

          List listaGara = new ArrayList();          
          List listaGaraFormBean = new ArrayList();
          SISVwTabelleGaraService service=(SISVwTabelleGaraService)SpringFactory.getSISBean(SpringFactory.SERVICES,"sisVwTabelleGaraService");          
          VwTabelleGaraCriteria example=new VwTabelleGaraCriteria();          
          try {
               listaGara = service.selectByExample(example);
               SISVwTabelleGaraViewHelper helper = new SISVwTabelleGaraViewHelper();
               listaGaraFormBean=helper.formattaListaVwTabelleGaraFormBean(listaGara);
               jSONObject = helper.formattaGaranzieCombo(listaGaraFormBean);
          } catch (Exception e) {
               e.printStackTrace();
          }
          return jSONObject;
     }

In serviceConfig.xml of Spring we have:

  <bean id="id_VwTabelleGaraDao" class="it.icg.sis.business.daoImpl.SISVwTabelleGaraDaoImpl">
    <property name="sqlMapClient">
        <ref bean="sqlMapClient"/>
    </property>
  </bean>
  
  <bean id="sisVwTabelleGaraService" class="it.icg.sis.business.serviceImpl.SISVwTabelleGaraServiceImpl">
         <constructor-arg ref="id_VwTabelleGaraDao"/>
  </bean>

I've got an error when I try to instantiate the service: can somebody help me?
Thanks and regards

Edited by: valeof on Jul 23, 2009 9:27 AM