Program: 3622
Project: 3622
Buggy source:
/** 
 * @param c context
 * @param item item containing bitstream to process
 * @param source source bitstream to process
 * @param boolean owerWrite false means do nothing if a matching filter rendition alreads exists
 * @return true if new rendition is created
 */
public boolean processBitstream(Context c,Item item,Bitstream source,boolean overWrite) throws Exception {
  String newName=getFilteredName(source.getName());
  Bitstream existingBitstream=null;
  Bundle targetBundle=null;
  Bundle[] bundles=item.getBundles(getBundleName());
  if (bundles.length > 0) {
    for (int i=0; i < bundles.length; i++) {
      Bitstream[] bitstreams=bundles[i].getBitstreams();
      for (int j=0; j < bitstreams.length; j++) {
        if (bitstreams[j].getName().equals(newName)) {
          targetBundle=bundles[i];
          existingBitstream=bitstreams[j];
        }
      }
    }
  }
  if (!overWrite && (existingBitstream != null)) {
    System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
    return false;
  }
  if (bundles.length < 1) {
    targetBundle=item.createBundle(getBundleName());
  }
 else {
    targetBundle=bundles[0];
  }
  InputStream destStream=getDestinationStream(source.retrieve());
  Bitstream b=targetBundle.createBitstream(destStream);
  b.setName(newName);
  b.setSource("String_Node_Str" + this.getClass().getName());
  b.update();
  BitstreamFormat bf=BitstreamFormat.findByShortDescription(c,getFormatString());
  b.setFormat(bf);
  if (existingBitstream != null) {
    targetBundle.removeBitstream(existingBitstream);
  }
  System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
  return true;
}

Fixed version (ground truth):
/** 
 * @param c context
 * @param item item containing bitstream to process
 * @param source source bitstream to process
 * @param boolean owerWrite false means do nothing if a matching filter rendition alreads exists
 * @return true if new rendition is created
 */
public boolean processBitstream(Context c,Item item,Bitstream source,boolean overWrite) throws Exception {
  String newName=getFilteredName(source.getName());
  Bitstream existingBitstream=null;
  Bundle targetBundle=null;
  Bundle[] bundles=item.getBundles(getBundleName());
  if (bundles.length > 0) {
    for (int i=0; i < bundles.length; i++) {
      Bitstream[] bitstreams=bundles[i].getBitstreams();
      for (int j=0; j < bitstreams.length; j++) {
        if (bitstreams[j].getName().equals(newName)) {
          targetBundle=bundles[i];
          existingBitstream=bitstreams[j];
        }
      }
    }
  }
  if (!overWrite && (existingBitstream != null)) {
    System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
    return false;
  }
  if (bundles.length < 1) {
    targetBundle=item.createBundle(getBundleName());
  }
 else {
    targetBundle=bundles[0];
  }
  InputStream destStream=getDestinationStream(source.retrieve());
  Bitstream b=targetBundle.createBitstream(destStream);
  b.setName(newName);
  b.setSource("String_Node_Str" + this.getClass().getName());
  BitstreamFormat bf=BitstreamFormat.findByShortDescription(c,getFormatString());
  b.setFormat(bf);
  b.update();
  if (existingBitstream != null) {
    targetBundle.removeBitstream(existingBitstream);
  }
  System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
  return true;
}