Program: 66708
Project: 66708
Buggy source:
private void renderAxes(IDeviceRenderer idr,PolarCoordinate pc,Series se,double magnitude){
  Location center=pc.getCenter();
  int iCount=pc.getCount();
  pc=new PolarCoordinate(center,iCount,1,0);
  Location lo=center.copyInstance();
  LineAttributes lia=null;
  LineAttributes wlia=null;
  RadarSeries rsd=getFirstSeries();
  wlia=rsd.getWebLineAttributes();
  if (wlia == null) {
    lia=LineAttributesImpl.create(ColorDefinitionImpl.GREY(),LineStyle.SOLID_LITERAL,1);
  }
 else {
    lia=wlia;
  }
  final LineRenderEvent lre=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),LineRenderEvent.class);
  final OvalRenderEvent ore=((EventObjectCache)idr).getEventObject(StructureSource.createSeries(se),OvalRenderEvent.class);
  lre.setLineAttributes(lia);
  lre.setStart(center);
  try {
    for (int i=0; i < iCount; i++) {
      pc.computeLocation(lo,i,magnitude);
      lre.setEnd(lo);
      idr.drawLine(lre);
      DataPointHints dph=dpha[i];
      if ((rsd.isSetShowCatLabels() && rsd.isShowCatLabels()) || (!rsd.isSetShowCatLabels())) {
        drawAxisRadialLabel(idr,pc,lo,i,dph.getBaseValue());
      }
    }
    String subType=getModel().getSubType();
    if (STANDARD_SUBTYPE_LITERAL.equals(subType) || BULLSEYE_SUBTYPE_LITERAL.equals(subType)) {
      ore.setBackground(lia.getColor());
      ore.setOutline(lia);
      Bounds bo=BoundsImpl.create(0,0,0,0);
      for (int sc=1; sc <= scaleCount; sc++) {
        double spiderMag=magnitude * sc / scaleCount;
        ore.setBounds(pc.computeBounds(bo,spiderMag));
        idr.drawOval(ore);
      }
    }
 else     if (SPIDER_SUBTYPE_LITERAL.equals(subType)) {
      Location lo1=lo.copyInstance();
      for (int sc=1; sc < scaleCount + 1; sc++) {
        double spiderMag=magnitude * sc / scaleCount;
        pc.computeLocation(lo1,0,spiderMag);
        for (int index=1; index < iCount + 1; index++) {
          lo.set(lo1.getX(),lo1.getY());
          pc.computeLocation(lo1,index,spiderMag);
          lre.setStart(lo);
          lre.setEnd(lo1);
          idr.drawLine(lre);
        }
      }
    }
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
}

Fixed version (ground truth):
private void renderAxes(IDeviceRenderer idr,PolarCoordinate pc,double magnitude) throws ChartException {
  Location center=pc.getCenter();
  int iCount=pc.getCount();
  pc=new PolarCoordinate(center,iCount,1,0);
  Location lo=center.copyInstance();
  LineAttributes lia=null;
  LineAttributes wlia=null;
  RadarSeries rsd=getFirstSeries();
  wlia=rsd.getWebLineAttributes();
  if (wlia == null) {
    lia=LineAttributesImpl.create(ColorDefinitionImpl.GREY(),LineStyle.SOLID_LITERAL,1);
  }
 else {
    lia=wlia;
  }
  StructureSource ss=StructureSource.createPlot(getModel().getPlot());
  final LineRenderEvent lre=((EventObjectCache)idr).getEventObject(ss,LineRenderEvent.class);
  final OvalRenderEvent ore=((EventObjectCache)idr).getEventObject(ss,OvalRenderEvent.class);
  lre.setLineAttributes(lia);
  lre.setStart(center);
  for (int i=0; i < iCount; i++) {
    pc.computeLocation(lo,i,magnitude);
    lre.setEnd(lo);
    idr.drawLine(lre);
    DataPointHints dph=dpha[i];
    if ((rsd.isSetShowCatLabels() && rsd.isShowCatLabels()) || (!rsd.isSetShowCatLabels())) {
      drawAxisRadialLabel(idr,pc,lo,i,dph.getBaseValue());
    }
  }
  String subType=getModel().getSubType();
  if (STANDARD_SUBTYPE_LITERAL.equals(subType) || BULLSEYE_SUBTYPE_LITERAL.equals(subType)) {
    ore.setBackground(lia.getColor());
    ore.setOutline(lia);
    Bounds bo=BoundsImpl.create(0,0,0,0);
    for (int sc=1; sc <= scaleCount; sc++) {
      double spiderMag=magnitude * sc / scaleCount;
      ore.setBounds(pc.computeBounds(bo,spiderMag));
      idr.drawOval(ore);
    }
  }
 else   if (SPIDER_SUBTYPE_LITERAL.equals(subType)) {
    Location lo1=lo.copyInstance();
    for (int sc=1; sc < scaleCount + 1; sc++) {
      double spiderMag=magnitude * sc / scaleCount;
      pc.computeLocation(lo1,0,spiderMag);
      for (int index=1; index < iCount + 1; index++) {
        lo.set(lo1.getX(),lo1.getY());
        pc.computeLocation(lo1,index,spiderMag);
        lre.setStart(lo);
        lre.setEnd(lo1);
        idr.drawLine(lre);
      }
    }
  }
}