Call RFC and receive a java.lang.NullPointerException ...

Question

Hello,
I develop a RFC adaptative project.
When i execute the application, i obtain the following exception:
   java.lang.NullPointerException
    at com.sap.tc.webdynpro.modelimpl.dynamicrfc.AiiModelClass.createNewBaseTypeDescriptor(AiiModelClass.java:256)
    at com.sap.tc.webdynpro.modelimpl.dynamicrfc.AiiModelClass.descriptor(AiiModelClass.java:222)
    at com.sap.tut.wd.rodlist.model.Ztest_Rod_Input.<init>(Ztest_Rod_Input.java:51)
    at com.sap.tut.wd.rodocomponent.RodoCust.wdDoInit(RodoCust.java:98)
    at com.sap.tut.wd.rodocomponent.wdp.InternalRodoCust.wdDoInit(InternalRodoCust.java:130)
    ... 45 more
Ztest_Rod_Input is my adaptative RFC ...
This excception appears with the following code line:
> ztest_rod_Input input = new ztest_rod_Input();
I tried with a known BAPI in other project and i don't have this exception ...
Have you any suggestions ?
Thanks a lot,
Rodolphe.

Answer 1

Hi Arch,
I execute your code and in the Input View i enter the following code:
>  public void onActionSearch  {
>String RFCelement = wdContext.currentContextElement().getLocalMatnr();
>wdThis.wdGetRodoCustController().wdGetContext().currentZtest_Rod_InputElement().setMatnr(RFCelement);
> wdThis.wdGetRodoCustController().executeZtest_Rod_Input();
When the user complete the input field and he execute the button Search ...
i obtain the following exception:
java.lang.NullPointerException
    at com.sap.tut.wd.rodocomponent.InputRodView.onActionSearch(InputRodView.java:145)
    at com.sap.tut.wd.rodocomponent.wdp.InternalInputRodView.wdInvokeEventHandler(InternalInputRodView.java:140)
    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.window.WindowPhaseModel.doHandleActionEvent(WindowPhaseModel.java:420)
    ... 26 more
Then when i look  the SDL server log i see:
#1141 05/06/2008 14:06:04.607 [SAPEngine_Application_Thread[impl:3]_12] ERROR com.sap.lcrabapapi.ejb.AbapSLDRequestBean: Caught an Exception while processing a JCO request. Check the RFC engine for sanity and check your server logs and traces for more information.
Thrown:
java.lang.NullPointerException
Rodolphe