Problem in Modeling in webdynpro view composition?

Question

hi
I have made the project TutWD_ViewComposition_init given in help library but getting null pointer exception
at:
public java.lang.String getImageSourceCa(IPrivateImageView.IContextElement element)
    //@@begin getImageSourceCalc(IPrivateImageView.IContextElement)
    if (wdContext.currentContextElement().getComponentUsageName().equals("LeftImageCompInst")) {
      return "leftperson.jpg";
    } else {
      return "rightperson.jpg";
    //@@end
If anybody has made this project and rectified this problem plz give reply.
regards
Nidhideep

Answer 1

hi
Armin and sunil ,i knw that component usage is null,i can solve this problem by context mapping,but problem is see the code:
public java.lang.String getTrayTitleCalc(IPrivateImageView.IContextElement element)
    //@@begin getTrayTitleCalc(IPrivateImageView.IContextElement)
       String groupName =
          "Instance of Web Dynpro Component 'ImageComp' named '"
            + wdContext.currentContextElement().getComponentUsageName()
            + "'";
       return groupName;
    //@@end
  //@@begin javadoc:getImageSourceCalc(IPrivateImageView.IContextElement)
Declared getter method for attribute ImageSourceCalc of node Context
@param element the element requested for the value
@return the calculated value for attribute ImageSourceCalc
  //@@end
  public java.lang.String getImageSourceCalc(IPrivateImageView.IContextElement element)
    //@@begin getImageSourceCalc(IPrivateImageView.IContextElement)
    if (wdContext.currentContextElement().getComponentUsageName().equals("LeftImageCompInst")) {
      return "leftperson.jpg";
    } else {
      return "rightperson.jpg";
Hw come my method getTraytitle gets the componentUsage while getImageSourceCalc donot ?
I think it is some conceptual problem rather than coding mistake .Plz do give ur views.
Regards
Nidhideep