How do I overlay an PNG on a JPG?

Question

I continued the development of some JAI code a old collegue of mine started on. I've searched on the net, and tried different solutions, but every time I try to save my output file, I get a java.lang.ArrayIndexOutOfBoundsException: 4802
The problem occurs when I try to save the resulting PlanarImage or if I try to do a .getAsBufferedImage() on the result.
The overlay is loaded in another method in the same class, and the overlay image is allways a PNG. The image sent as a parameter to the method below is allways a JPEG.
Can anyone help me out here, what did I get wrong?
This is my code:
public PlanarImage overlayImage(PlanarImage img, String overlayPath, int position, int margin) {
          try{
               float x = 0;
               float y = 0;          
               // Background image. Create a renderable version.
               ParameterBlockJAI pb = new ParameterBlockJAI("renderable");
               pb.addSource(img);
               pb.setParameter("height", (float) img.getHeight());
               RenderableOp src2 = JAI.createRenderable("renderable", pb);          
               // Create a renderable version of the overlay image.
               pb = new ParameterBlockJAI("renderable");
               pb.addSource(getOverlay(overlayPath));
               pb.setParameter("height", (float) getOverlay(overlayPath).getHeight());
               RenderableOp rendOver = JAI.createRenderable("renderable", pb);               
              // Get position
              if (position == TOP_LEFT) {
                   x = margin;
                   y = margin;
              else if (position == TOP_RIGHT) {
                   x = (src2.getWidth() - rendOver.getWidth()) - margin;
                   y = margin;
              else if (position == BOTTOM_LEFT) {
                   x = margin;
                   y = (src2.getHeight() - rendOver.getHeight()) - margin;
              else if (position == BOTTOM_RIGHT) {
                   x = (src2.getWidth() - rendOver.getWidth()) - margin;
                   y = (src2.getHeight() - rendOver.getHeight()) - margin;
              // Move overlay to target position
              ParameterBlock pbx = new ParameterBlock();
              pbx.addSource(rendOver);
              pbx.add(x).add(y);
              rendOver = JAI.createRenderable("translate", pbx, null);          
              // Get the RGB bands.
             pb = new ParameterBlockJAI("bandSelect", "renderable");
             pb.addSource(rendOver);
             pb.setParameter("bandIndices", new int[] {0, 1, 2});
             RenderableOp src1 = JAI.createRenderable("bandSelect", pb);
               // Get the alpha band.
               pb = new ParameterBlockJAI("bandSelect", "renderable");
               pb.addSource(rendOver);
               pb.setParameter("bandIndices", new int[] {3});
               RenderableOp alpha1 = JAI.createRenderable("bandSelect", pb);
               // Setup and create the composite operation.
               pb = new ParameterBlockJAI("composite");
               pb.addSource(src1.createScaledRendering(currentOverlayImg.getWidth(), currentOverlayImg.getHeight(), null));
               pb.addSource(src2.createScaledRendering(img.getWidth(), img.getHeight(), null));          
               pb.setParameter("source1Alpha", alpha1.createScaledRendering(currentOverlayImg.getWidth(), currentOverlayImg.getHeight(), null));
               pb.setParameter("source2Alpha", null);
               pb.setParameter("alphaPremultiplied", false);
               pb.setParameter("destAlpha", CompositeDescriptor.NO_DESTINATION_ALPHA);
               RenderedOp composited =  JAI.create("composite", pb);
               // Overlay the composed image onto the original image.
               pb = new ParameterBlockJAI("overlay", "rendered");          
               pb.setSource("source0", src2.createScaledRendering(img.getWidth(), img.getHeight(), null));
               pb.setSource("source1", composited);          
               returnJAI.create("overlay", pb, null);
          }catch(Exception e){
               System.out.println("Error while overlaying image :: " + e.toString());
          return null;
     }

Answer 1

Use the uninstaller that came with the application.
If no unistaller then drag it to the Trash and empty theTrash.
Allan