Program: 70022
Project: 70022
Buggy source:
/** 
 * Renders the background.
 * @param ipr
 * @param p
 * @throws ChartException
 */
protected void renderBackground(IPrimitiveRenderer ipr,Plot p) throws ChartException {
  final double dScale=getDeviceScale();
  final RectangleRenderEvent rre=((EventObjectCache)ipr).getEventObject(StructureSource.createPlot(p),RectangleRenderEvent.class);
  rre.updateFrom(p,dScale);
  ipr.fillRectangle(rre);
  ipr.drawRectangle(rre);
  PlotComputation oComputations=getComputations();
  if (oComputations instanceof PlotWithoutAxes) {
    final PlotWithoutAxes pwoa=(PlotWithoutAxes)oComputations;
    final ClientArea ca=p.getClientArea();
    Bounds bo=pwoa.getPlotBounds();
    if (ca.getShadowColor() != null) {
      rre.setBounds(goFactory.translateBounds(bo,3,3));
      rre.setBackground(ca.getShadowColor());
      ipr.fillRectangle(rre);
    }
    rre.setBounds(bo);
    rre.setBackground(ca.getBackground());
    ipr.fillRectangle(rre);
    if (!ca.getOutline().isSetVisible()) {
      throw new ChartException(ChartEnginePlugin.ID,ChartException.RENDERING,"String_Node_Str",Messages.getResourceBundle(rtc.getULocale()));
    }
    if (ca.getOutline().isVisible()) {
      Size sz=pwoa.getCellSize();
      final LineRenderEvent lre=((EventObjectCache)ipr).getEventObject(StructureSource.createPlot(p),LineRenderEvent.class);
      lre.setLineAttributes(ca.getOutline());
      int colCount=pwoa.getColumnCount();
      int rowCount=pwoa.getRowCount();
      ChartWithoutAxes cwoa=pwoa.getModel();
      if (cwoa instanceof DialChart && ((DialChart)cwoa).isDialSuperimposition()) {
        colCount=1;
        rowCount=1;
      }
      for (int i=0; i < colCount + 1; i++) {
        lre.setStart(goFactory.createLocation(bo.getLeft() + i * sz.getWidth(),bo.getTop()));
        lre.setEnd(goFactory.createLocation(bo.getLeft() + i * sz.getWidth(),bo.getTop() + bo.getHeight()));
        ipr.drawLine(lre);
      }
      for (int j=0; j < rowCount + 1; j++) {
        lre.setStart(goFactory.createLocation(bo.getLeft(),bo.getTop() + j * sz.getHeight()));
        lre.setEnd(goFactory.createLocation(bo.getLeft() + bo.getWidth(),bo.getTop() + j * sz.getHeight()));
        ipr.drawLine(lre);
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Renders the background.
 * @param ipr
 * @param p
 * @throws ChartException
 */
protected void renderBackground(IPrimitiveRenderer ipr,Plot p) throws ChartException {
  final double dScale=getDeviceScale();
  final RectangleRenderEvent rre=((EventObjectCache)ipr).getEventObject(StructureSource.createPlot(p),RectangleRenderEvent.class);
  rre.updateFrom(p,dScale);
  ipr.fillRectangle(rre);
  ipr.drawRectangle(rre);
  PlotComputation oComputations=getComputations();
  if (oComputations instanceof PlotWithoutAxes) {
    final PlotWithoutAxes pwoa=(PlotWithoutAxes)oComputations;
    final ClientArea ca=p.getClientArea();
    Bounds bo=pwoa.getPlotBounds();
    if (ca.getShadowColor() != null) {
      rre.setBounds(goFactory.translateBounds(bo,3,3));
      rre.setBackground(ca.getShadowColor());
      ipr.fillRectangle(rre);
    }
    rre.setBounds(bo);
    rre.setBackground(ca.getBackground());
    ipr.fillRectangle(rre);
    if (ca.getOutline().isVisible()) {
      Size sz=pwoa.getCellSize();
      final LineRenderEvent lre=((EventObjectCache)ipr).getEventObject(StructureSource.createPlot(p),LineRenderEvent.class);
      lre.setLineAttributes(ca.getOutline());
      int colCount=pwoa.getColumnCount();
      int rowCount=pwoa.getRowCount();
      ChartWithoutAxes cwoa=pwoa.getModel();
      if (cwoa instanceof DialChart && ((DialChart)cwoa).isDialSuperimposition()) {
        colCount=1;
        rowCount=1;
      }
      for (int i=0; i < colCount + 1; i++) {
        lre.setStart(goFactory.createLocation(bo.getLeft() + i * sz.getWidth(),bo.getTop()));
        lre.setEnd(goFactory.createLocation(bo.getLeft() + i * sz.getWidth(),bo.getTop() + bo.getHeight()));
        ipr.drawLine(lre);
      }
      for (int j=0; j < rowCount + 1; j++) {
        lre.setStart(goFactory.createLocation(bo.getLeft(),bo.getTop() + j * sz.getHeight()));
        lre.setEnd(goFactory.createLocation(bo.getLeft() + bo.getWidth(),bo.getTop() + j * sz.getHeight()));
        ipr.drawLine(lre);
      }
    }
  }
}