Program: 66707
Project: 66707
Buggy source:
private void renderPolys(IDeviceRenderer idr,Location[] prelo,Series se,SeriesDefinition sd){
  int iThisSeriesIndex=sd.getRunTimeSeries().indexOf(se);
  if (iThisSeriesIndex == -1)   iThisSeriesIndex=getSeriesIndex();
  final EList<Fill> elPalette=sd.getSeriesPalette().getEntries();
  Fill fPaletteEntry=FillUtil.getPaletteFill(elPalette,iThisSeriesIndex);
  LineAttributes llia=((RadarSeries)se).getLineAttributes();
  final PolygonRenderEvent pre=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),PolygonRenderEvent.class);
  final LineRenderEvent lre=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),LineRenderEvent.class);
  if (se.isSetTranslucent() && se.isTranslucent()) {
    if (fPaletteEntry instanceof ColorDefinition) {
      fPaletteEntry=goFactory.translucent((ColorDefinition)fPaletteEntry);
    }
  }
  if (!((RadarSeries)se).isFillPolys()) {
    lre.setLineAttributes(llia);
    for (int i=0; i < (prelo.length - 1); i++) {
      if (prelo[i] == null || prelo[i + 1] == null) {
        continue;
      }
      lre.setStart(prelo[i]);
      lre.setEnd(prelo[i + 1]);
      try {
        idr.drawLine(lre);
      }
 catch (      Exception e) {
        e.printStackTrace();
      }
    }
    if (((RadarSeries)se).isConnectEndpoints()) {
      if (prelo[0] != null && prelo[prelo.length - 1] != null) {
        lre.setStart(prelo[0]);
        lre.setEnd(prelo[prelo.length - 1]);
        try {
          idr.drawLine(lre);
        }
 catch (        Exception e) {
          e.printStackTrace();
        }
      }
    }
  }
 else {
    pre.setBackground(fPaletteEntry);
    pre.setPoints(prelo);
    pre.setOutline(llia);
    try {
      idr.drawPolygon(pre);
      idr.fillPolygon(pre);
    }
 catch (    Exception e) {
      e.printStackTrace();
    }
  }
}

Fixed version (ground truth):
private void renderPolys(IDeviceRenderer idr,Location[] prelo,Series se,SeriesDefinition sd) throws ChartException {
  int iThisSeriesIndex=sd.getRunTimeSeries().indexOf(se);
  if (iThisSeriesIndex == -1)   iThisSeriesIndex=getSeriesIndex();
  final EList<Fill> elPalette=sd.getSeriesPalette().getEntries();
  Fill fPaletteEntry=FillUtil.getPaletteFill(elPalette,iThisSeriesIndex);
  LineAttributes llia=((RadarSeries)se).getLineAttributes();
  final PolygonRenderEvent pre=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),PolygonRenderEvent.class);
  final LineRenderEvent lre=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),LineRenderEvent.class);
  if (se.isSetTranslucent() && se.isTranslucent()) {
    if (fPaletteEntry instanceof ColorDefinition) {
      fPaletteEntry=goFactory.translucent((ColorDefinition)fPaletteEntry);
    }
  }
  if (!((RadarSeries)se).isFillPolys()) {
    lre.setLineAttributes(llia);
    for (int i=0; i < (prelo.length - 1); i++) {
      if (prelo[i] == null || prelo[i + 1] == null) {
        continue;
      }
      lre.setStart(prelo[i]);
      lre.setEnd(prelo[i + 1]);
      idr.drawLine(lre);
    }
    if (((RadarSeries)se).isConnectEndpoints()) {
      if (prelo[0] != null && prelo[prelo.length - 1] != null) {
        lre.setStart(prelo[0]);
        lre.setEnd(prelo[prelo.length - 1]);
        idr.drawLine(lre);
      }
    }
  }
 else {
    pre.setBackground(fPaletteEntry);
    pre.setPoints(prelo);
    pre.setOutline(llia);
    idr.drawPolygon(pre);
    idr.fillPolygon(pre);
  }
}