ErrorStack Trace while creating DialogBoxes

Question

Hi all,
I am trying to implement the pdf (Handling Transactions with BAPIs in Web Dynpro)It is giving an error while creating DialgBoxes
The error is
Error stacktrace:
java.lang.NullPointerException
     at com.sap.tc.webdynpro.clientserver.window.ConfirmationDialogDelegate.<init>(ConfirmationDialogDelegate.java:58)
     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.createConfirmationWindow(ClientComponent.java:926)
     at com.sap.tut.webdynpro.tutorial.FlightBookingView.onActionBookFlight(FlightBookingView.java:169)
     at com.sap.tut.webdynpro.tutorial.wdp.InternalFlightBookingView.wdInvokeEventHandler(InternalFlightBookingView.java:280)
     at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)
     at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:67)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleAction(WebDynproMainTask.java:100)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:299)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:635)
The code of BookFligh method is
public void onActionBookFlight(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionBookFlight(ServerEvent)
     wdContext.currentBapi_Flight_Checkavailibility_InputElement().setAirlineid(wdContext.currentBooking_DataElement().getAirlineid());
     wdContext.currentBapi_Flight_Checkavailibility_InputElement().setConnectionid( wdContext.currentBooking_DataElement().getConnectid());
     wdContext.currentBapi_Flight_Checkavailibility_InputElement().setFlightdate( wdContext.currentBooking_DataElement().getFlightdate());
    wdThis.wdGetFlightBookingCustController().executebapi_CheckAvailibility();
    if(wdContext.currentReturnElement().getType().equals("S"))
          IWDConfirmationDialog dialog;
          String dialogText="The Flight Is available";
          dialog=wdComponentAPI.getWindowManager().createConfirmationWindow(dialogText,
                           wdControllerAPI.getControllerInfo().findInEventHandlers("Reserve"),"Reserve Flight");
          dialog.addChoice(wdControllerAPI.getControllerInfo().findInEventHandlers("Book"),"Book Flight");
          dialog.addChoice(wdControllerAPI.getControllerInfo().findInEventHandlers("Cancel"),"Cancel Flight");
         dialog.open();
    else
          wdComponentAPI.getMessageManager().reportSuccess("Type val is"+wdContext.currentReturnElement().getType());
          wdComponentAPI.getMessageManager().reportWarning("The Flight is not booked"+
                                                           wdContext.currentReturnElement().getMessage());
    //@@end
Can anyone tell me where the error is???
Regards
Padma

Answer 1

Hi,
It is giving error at  line 169 of Bookingviewjava" menas at
dialog=wdComponentAPI.getWindowManager().createConfirmationWindow(dialogText,
The following code is
                 wdControllerAPI.getViewInfo().getViewController().findInEventHandlers("Reserve"),"Reserve Flight");
          dialog.addChoice(wdControllerAPI.getControllerInfo().findInEventHandlers("Book"),"Book Flight");
          dialog.addChoice(wdControllerAPI.getControllerInfo().findInEventHandlers("Cancel"),"Cancel Flight");
         dialog.open();
    else
          wdComponentAPI.getMessageManager().reportSuccess("Type val is"+wdContext.currentReturnElement().getType());
          wdComponentAPI.getMessageManager().reportWarning("The Flight is not booked"+
                                                           wdContext.currentReturnElement().getMessage());
    //@@end
Regards
Padma