Program: 3556
Project: 3556
Buggy source:
/** 
 * processBitstream is a utility class that calls the virtual methods from the current MediaFilter class. It scans the bitstreams in an item, and decides if a bitstream has  already been filtered, and if not or if overWrite is set, invokes the  filter.
 * @param c context
 * @param item item containing bitstream to process
 * @param source source bitstream to process
 * @param mediaFilter MediaFilter to perform filtering
 * @return true if new rendition is created, false if rendition alreadyexists and overWrite is not set
 */
public static boolean processBitstream(Context c,Item item,Bitstream source,FormatFilter formatFilter) throws Exception {
  if (!formatFilter.preProcessBitstream(c,item,source))   return false;
  boolean overWrite=MediaFilterManager.isForce;
  String newName=formatFilter.getFilteredName(source.getName());
  Bitstream existingBitstream=null;
  Bundle targetBundle=null;
  Bundle[] bundles=item.getBundles(formatFilter.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;
  }
  InputStream destStream=formatFilter.getDestinationStream(source.retrieve());
  if (bundles.length < 1) {
    targetBundle=item.createBundle(formatFilter.getBundleName());
  }
 else {
    targetBundle=bundles[0];
  }
  Bitstream b=targetBundle.createBitstream(destStream);
  b.setName(newName);
  b.setSource("String_Node_Str" + formatFilter.getClass().getName() + "String_Node_Str"+ DCDate.getCurrent()+ "String_Node_Str");
  b.setDescription(formatFilter.getDescription());
  BitstreamFormat bf=BitstreamFormat.findByShortDescription(c,formatFilter.getFormatString());
  b.setFormat(bf);
  b.update();
  AuthorizeManager.removeAllPolicies(c,b);
  AuthorizeManager.inheritPolicies(c,source,b);
  if (existingBitstream != null) {
    targetBundle.removeBitstream(existingBitstream);
  }
  System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
  formatFilter.postProcessBitstream(c,item,b);
  return true;
}

Fixed version (ground truth):
/** 
 * processBitstream is a utility class that calls the virtual methods from the current MediaFilter class. It scans the bitstreams in an item, and decides if a bitstream has  already been filtered, and if not or if overWrite is set, invokes the  filter.
 * @param c context
 * @param item item containing bitstream to process
 * @param source source bitstream to process
 * @param formatFilter FormatFilter to perform filtering
 * @return true if new rendition is created, false if rendition alreadyexists and overWrite is not set
 */
public static boolean processBitstream(Context c,Item item,Bitstream source,FormatFilter formatFilter) throws Exception {
  if (!formatFilter.preProcessBitstream(c,item,source))   return false;
  boolean overWrite=MediaFilterManager.isForce;
  String newName=formatFilter.getFilteredName(source.getName());
  Bitstream existingBitstream=null;
  Bundle targetBundle=null;
  Bundle[] bundles=item.getBundles(formatFilter.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;
  }
  InputStream destStream=formatFilter.getDestinationStream(source.retrieve());
  if (bundles.length < 1) {
    targetBundle=item.createBundle(formatFilter.getBundleName());
  }
 else {
    targetBundle=bundles[0];
  }
  Bitstream b=targetBundle.createBitstream(destStream);
  b.setName(newName);
  b.setSource("String_Node_Str" + formatFilter.getClass().getName() + "String_Node_Str"+ DCDate.getCurrent()+ "String_Node_Str");
  b.setDescription(formatFilter.getDescription());
  BitstreamFormat bf=BitstreamFormat.findByShortDescription(c,formatFilter.getFormatString());
  b.setFormat(bf);
  b.update();
  AuthorizeManager.removeAllPolicies(c,b);
  AuthorizeManager.inheritPolicies(c,source,b);
  if (existingBitstream != null) {
    targetBundle.removeBitstream(existingBitstream);
  }
  System.out.println("String_Node_Str" + source.getID() + "String_Node_Str"+ newName+ "String_Node_Str");
  formatFilter.postProcessBitstream(c,item,b);
  return true;
}