Program: 185088
Project: 185088
Buggy source:
/** 
 * Main method
 * @param args
 * @throws Docx4JException 
 */
public static void main(String[] args) throws Docx4JException {
  String inputfilepath=System.getProperty("String_Node_Str") + "String_Node_Str";
  String chartPartName="String_Node_Str";
  String xlsPartName="String_Node_Str";
  String outputfilepath=System.getProperty("String_Node_Str") + "String_Node_Str" + System.currentTimeMillis()+ "String_Node_Str";
  Random rand=new Random();
  String firstValue=String.valueOf(rand.nextInt(99));
  String secondValue=String.valueOf(rand.nextInt(99));
  PresentationMLPackage ppt=(PresentationMLPackage)OpcPackage.load(new java.io.File(inputfilepath));
  Chart chart=(Chart)ppt.getParts().get(new PartName(chartPartName));
  List<Object> objects=chart.getJaxbElement().getChart().getPlotArea().getAreaChartOrArea3DChartOrLineChart();
  for (  Object object : objects) {
    if (object instanceof CTBarChart) {
      List<CTBarSer> ctBarSers=((CTBarChart)object).getSer();
      for (      CTBarSer ctBarSer : ctBarSers) {
        List<CTNumVal> ctNumVals=ctBarSer.getVal().getNumRef().getNumCache().getPt();
        for (        CTNumVal ctNumVal : ctNumVals) {
          System.out.println("String_Node_Str" + ctNumVal.getV());
          if (ctNumVal.getIdx() == 0) {
            ctNumVal.setV(firstValue);
          }
 else           if (ctNumVal.getIdx() == 1) {
            ctNumVal.setV(secondValue);
          }
          System.out.println("String_Node_Str" + ctNumVal.getV());
        }
      }
    }
  }
  EmbeddedPackagePart epp=(EmbeddedPackagePart)ppt.getParts().get(new PartName(xlsPartName));
  if (epp == null) {
    throw new Docx4JException("String_Node_Str" + xlsPartName);
  }
  InputStream is=BufferUtil.newInputStream(epp.getBuffer());
  SpreadsheetMLPackage spreadSheet=(SpreadsheetMLPackage)SpreadsheetMLPackage.load(is);
  Map<PartName,Part> partsMap=spreadSheet.getParts().getParts();
  Iterator<Entry<PartName,Part>> it=partsMap.entrySet().iterator();
  while (it.hasNext()) {
    Map.Entry<PartName,Part> pairs=it.next();
    if (partsMap.get(pairs.getKey()) instanceof WorksheetPart) {
      WorksheetPart wsp=(WorksheetPart)partsMap.get(pairs.getKey());
      List<Row> rows=wsp.getJaxbElement().getSheetData().getRow();
      for (      Row row : rows) {
        List<Cell> cells=row.getC();
        for (        Cell cell : cells) {
          if (cell.getR().equals("String_Node_Str") && cell.getV() != null) {
            System.out.println("String_Node_Str" + cell.getV());
            cell.setV(firstValue);
          }
 else           if (cell.getR().equals("String_Node_Str") && cell.getV() != null) {
            System.out.println("String_Node_Str" + cell.getV());
            cell.setV(secondValue);
          }
        }
      }
    }
  }
  ByteArrayOutputStream baos=new ByteArrayOutputStream();
  SaveToZipFile saver=new SaveToZipFile(spreadSheet);
  saver.save(baos);
  epp.setBinaryData(baos.toByteArray());
  ppt.addTargetPart(epp);
  ppt.save(new java.io.File(outputfilepath));
  System.out.println("String_Node_Str" + outputfilepath);
}

Fixed version (ground truth):
/** 
 * Main method
 * @param args
 * @throws Docx4JException 
 */
public static void main(String[] args) throws Docx4JException {
  String inputfilepath=System.getProperty("String_Node_Str") + "String_Node_Str";
  String chartPartName="String_Node_Str";
  String xlsPartName="String_Node_Str";
  String outputfilepath=System.getProperty("String_Node_Str") + "String_Node_Str" + System.currentTimeMillis()+ "String_Node_Str";
  Random rand=new Random();
  String firstValue=String.valueOf(rand.nextInt(99));
  String secondValue=String.valueOf(rand.nextInt(99));
  PresentationMLPackage ppt=(PresentationMLPackage)OpcPackage.load(new java.io.File(inputfilepath));
  Chart chart=(Chart)ppt.getParts().get(new PartName(chartPartName));
  List<Object> objects=chart.getJaxbElement().getChart().getPlotArea().getAreaChartOrArea3DChartOrLineChart();
  for (  Object object : objects) {
    if (object instanceof CTBarChart) {
      List<CTBarSer> ctBarSers=((CTBarChart)object).getSer();
      for (      CTBarSer ctBarSer : ctBarSers) {
        List<CTNumVal> ctNumVals=ctBarSer.getVal().getNumRef().getNumCache().getPt();
        for (        CTNumVal ctNumVal : ctNumVals) {
          System.out.println("String_Node_Str" + ctNumVal.getV());
          if (ctNumVal.getIdx() == 0) {
            ctNumVal.setV(firstValue);
          }
 else           if (ctNumVal.getIdx() == 1) {
            ctNumVal.setV(secondValue);
          }
          System.out.println("String_Node_Str" + ctNumVal.getV());
        }
      }
    }
  }
  EmbeddedPackagePart epp=(EmbeddedPackagePart)ppt.getParts().get(new PartName(xlsPartName));
  if (epp == null) {
    throw new Docx4JException("String_Node_Str" + xlsPartName);
  }
  InputStream is=BufferUtil.newInputStream(epp.getBuffer());
  SpreadsheetMLPackage spreadSheet=(SpreadsheetMLPackage)SpreadsheetMLPackage.load(is);
  Map<PartName,Part> partsMap=spreadSheet.getParts().getParts();
  Iterator<Entry<PartName,Part>> it=partsMap.entrySet().iterator();
  while (it.hasNext()) {
    Map.Entry<PartName,Part> pairs=it.next();
    if (partsMap.get(pairs.getKey()) instanceof WorksheetPart) {
      WorksheetPart wsp=(WorksheetPart)partsMap.get(pairs.getKey());
      List<Row> rows=wsp.getJaxbElement().getSheetData().getRow();
      for (      Row row : rows) {
        List<Cell> cells=row.getC();
        for (        Cell cell : cells) {
          if (cell.getR().equals("String_Node_Str") && cell.getV() != null) {
            System.out.println("String_Node_Str" + cell.getV());
            cell.setT(STCellType.STR);
            cell.setV(firstValue);
          }
 else           if (cell.getR().equals("String_Node_Str") && cell.getV() != null) {
            System.out.println("String_Node_Str" + cell.getV());
            cell.setT(STCellType.STR);
            cell.setV(secondValue);
          }
        }
      }
    }
  }
  ByteArrayOutputStream baos=new ByteArrayOutputStream();
  SaveToZipFile saver=new SaveToZipFile(spreadSheet);
  saver.save(baos);
  epp.setBinaryData(baos.toByteArray());
  ppt.save(new java.io.File(outputfilepath));
  System.out.println("String_Node_Str" + outputfilepath);
}