Program: 21369
Project: 21369
Buggy source:
private String execprozess(File file,String password){
  try {
    LinkedList<String> params=new LinkedList<String>();
    if (password != "String_Node_Str") {
      params.add("String_Node_Str" + password);
    }
 else {
      params.add("String_Node_Str");
    }
    if (overwriteFiles) {
      params.add("String_Node_Str");
    }
 else {
      params.add("String_Node_Str");
    }
    params.add("String_Node_Str");
    params.add("String_Node_Str");
    params.add("String_Node_Str");
    File parent;
    boolean b=false;
    if (extractFolder != null && extractFolder.isDirectory()) {
      b=true;
      parent=extractFolder;
      params.add(file.getAbsolutePath());
    }
 else {
      parent=file.getParentFile();
      params.add(file.getName());
    }
    Process p=createProcess(unrar,params.toArray(new String[]{}),parent);
    String str=startInputListener(p,parent);
    if (str.matches(allOk)) {
      Pattern pattern=Pattern.compile("String_Node_Str");
      Matcher matcher=pattern.matcher(str);
      if (autoDelete) {
        while (matcher.find()) {
          File delfile;
          if (b)           delfile=new File(matcher.group(1));
 else           delfile=new File(file.getParentFile(),matcher.group(1));
          if (!delfile.isFile()) {
            logger.warning(str);
            logger.warning("String_Node_Str" + delfile.getName());
          }
 else           if (!delfile.delete()) {
            logger.warning(str);
            logger.warning("String_Node_Str" + delfile.getName());
          }
        }
      }
 else       if (b) {
        while (matcher.find()) {
          File ufile=new File(file.getParentFile(),matcher.group(1));
          unpackedlist.add(ufile);
        }
        saveUnpackedList();
      }
      pattern=Pattern.compile("String_Node_Str");
      matcher=pattern.matcher(str);
      HashMap<File,String> nfiles=new HashMap<File,String>();
      while (matcher.find()) {
        File f=new File(parent,matcher.group(1));
        nfiles.put(f,null);
        unpackedFiles.add(f);
      }
      JUnrar un=new JUnrar();
      un.files=nfiles;
      un.standardPassword=standardPassword;
      un.autoDelete=autoDelete;
      un.unrar=unrar;
      un.useToextractlist=false;
      un.overwriteFiles=overwriteFiles;
      unpackedFiles.addAll(un.unpackedFiles);
      Iterator<File> iter=unpackedFiles.iterator();
      while (iter.hasNext()) {
        File file2=(File)iter.next();
        if (!file2.exists())         iter.remove();
      }
    }
    return str;
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  return null;
}

Fixed version (ground truth):
private String execprozess(File file,String password){
  try {
    LinkedList<String> params=new LinkedList<String>();
    if (password != "String_Node_Str") {
      params.add("String_Node_Str" + password);
    }
 else {
      params.add("String_Node_Str");
    }
    if (overwriteFiles) {
      params.add("String_Node_Str");
    }
 else {
      params.add("String_Node_Str");
    }
    params.add("String_Node_Str");
    params.add("String_Node_Str");
    params.add("String_Node_Str");
    File parent;
    boolean b=false;
    if (extractFolder != null && extractFolder.isDirectory()) {
      b=true;
      parent=extractFolder;
      params.add(file.getAbsolutePath());
    }
 else {
      parent=file.getParentFile();
      params.add(file.getName());
    }
    Process p=createProcess(unrar,params.toArray(new String[]{}),parent);
    String str=startInputListener(p,parent);
    if (str.matches(allOk)) {
      Pattern pattern=Pattern.compile("String_Node_Str");
      Matcher matcher=pattern.matcher(str);
      if (autoDelete) {
        while (matcher.find()) {
          File delfile;
          if (b)           delfile=new File(matcher.group(1));
 else           delfile=new File(file.getParentFile(),matcher.group(1));
          if (!delfile.isFile()) {
            logger.warning(str);
            logger.warning("String_Node_Str" + delfile.getName());
          }
 else           if (!delfile.delete()) {
            logger.warning(str);
            logger.warning("String_Node_Str" + delfile.getName());
          }
        }
      }
 else       if (b) {
        while (matcher.find()) {
          File ufile=new File(file.getParentFile(),matcher.group(1));
          unpackedlist.add(ufile);
        }
        saveUnpackedList();
      }
      pattern=Pattern.compile("String_Node_Str");
      matcher=pattern.matcher(str);
      HashMap<File,String> nfiles=new HashMap<File,String>();
      while (matcher.find()) {
        File f=new File(parent,matcher.group(1));
        nfiles.put(f,null);
        unpackedFiles.add(f);
      }
      JUnrar un=new JUnrar();
      un.files=nfiles;
      un.standardPassword=standardPassword;
      un.autoDelete=autoDelete;
      un.unrar=unrar;
      un.useToextractlist=false;
      un.overwriteFiles=overwriteFiles;
      unpackedFiles.addAll(un.unrar());
      Iterator<File> iter=unpackedFiles.iterator();
      while (iter.hasNext()) {
        File file2=(File)iter.next();
        if (!file2.exists())         iter.remove();
      }
    }
    return str;
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  return null;
}