Program: 25585
Project: 25585
Buggy source:
private void generateLevelZero(final Double z,final Bounds layerBounds,final BoxBounds boxBounds,final int tileCount,final ImageProcessorCache imageProcessorCache,final BoxMipmapGenerator boxMipmapGenerator,final IGridPaths iGridPaths) throws URISyntaxException, IOException {
  final Progress progress=new Progress(tileCount);
  RenderParameters renderParameters;
  String parametersUrl;
  BufferedImage levelZeroImage;
  File levelZeroFile;
  int row=boxBounds.firstRow;
  int column;
  for (int y=boxBounds.firstY; y < layerBounds.getMaxY(); y+=boxHeight) {
    column=boxBounds.firstColumn;
    for (int x=boxBounds.firstX; x < layerBounds.getMaxX(); x+=boxWidth) {
      levelZeroFile=BoxMipmapGenerator.getImageFile(format,boxDirectory,0,boxBounds.z,row,column);
      if (params.forceGeneration || (!levelZeroFile.exists())) {
        parametersUrl=renderDataClient.getRenderParametersUrlString(stack,x,y,z,boxWidth,boxHeight,1.0);
        LOG.info("String_Node_Str",z,parametersUrl);
        renderParameters=RenderParameters.loadFromUrl(parametersUrl);
        renderParameters.setSkipInterpolation(params.skipInterpolation);
        renderParameters.setBackgroundRGBColor(backgroundRGBColor);
        if (renderParameters.hasTileSpecs()) {
          levelZeroImage=renderParameters.openTargetImage();
          Render.render(renderParameters,levelZeroImage,imageProcessorCache);
          BoxMipmapGenerator.saveImage(levelZeroImage,levelZeroFile,params.label,format);
        }
 else {
          LOG.info("String_Node_Str",z,row,column);
        }
        boxMipmapGenerator.addSource(row,column,levelZeroFile);
        if (iGridPaths != null) {
          iGridPaths.addImage(levelZeroFile,row,column);
        }
        progress.markProcessedTilesForRow(y,renderParameters);
      }
 else {
        LOG.info("String_Node_Str",levelZeroFile.getAbsolutePath());
      }
      column++;
    }
    LOG.info("String_Node_Str",z,row,boxBounds.lastRow,progress,imageProcessorCache.getStats());
    row++;
  }
}

Fixed version (ground truth):
private void generateLevelZero(final Double z,final Bounds layerBounds,final BoxBounds boxBounds,final int tileCount,final ImageProcessorCache imageProcessorCache,final BoxMipmapGenerator boxMipmapGenerator,final IGridPaths iGridPaths) throws URISyntaxException, IOException {
  final Progress progress=new Progress(tileCount);
  RenderParameters renderParameters;
  String parametersUrl;
  BufferedImage levelZeroImage;
  File levelZeroFile;
  int row=boxBounds.firstRow;
  int column;
  for (int y=boxBounds.firstY; y < layerBounds.getMaxY(); y+=boxHeight) {
    column=boxBounds.firstColumn;
    for (int x=boxBounds.firstX; x < layerBounds.getMaxX(); x+=boxWidth) {
      levelZeroFile=BoxMipmapGenerator.getImageFile(format,boxDirectory,0,boxBounds.z,row,column);
      if (params.forceGeneration || (!levelZeroFile.exists())) {
        parametersUrl=renderDataClient.getRenderParametersUrlString(stack,x,y,z,boxWidth,boxHeight,1.0);
        LOG.info("String_Node_Str",z,parametersUrl);
        renderParameters=RenderParameters.loadFromUrl(parametersUrl);
        renderParameters.setSkipInterpolation(params.skipInterpolation);
        renderParameters.setBackgroundRGBColor(backgroundRGBColor);
        if (renderParameters.hasTileSpecs()) {
          levelZeroImage=renderParameters.openTargetImage();
          Render.render(renderParameters,levelZeroImage,imageProcessorCache);
          BoxMipmapGenerator.saveImage(levelZeroImage,levelZeroFile,params.label,format);
          boxMipmapGenerator.addSource(row,column,levelZeroFile);
          if (iGridPaths != null) {
            iGridPaths.addImage(levelZeroFile,row,column);
          }
        }
 else {
          LOG.info("String_Node_Str",z,row,column);
        }
      }
 else {
        LOG.info("String_Node_Str",levelZeroFile.getAbsolutePath());
        renderParameters=null;
        boxMipmapGenerator.addSource(row,column,levelZeroFile);
        if (iGridPaths != null) {
          iGridPaths.addImage(levelZeroFile,row,column);
        }
      }
      progress.markProcessedTilesForRow(y,renderParameters);
      column++;
    }
    LOG.info("String_Node_Str",z,row,boxBounds.lastRow,progress,imageProcessorCache.getStats());
    row++;
  }
}