#fixed code
                              public void open() throws IOException {
    try {
      myLock.writeLock().lock();
    this.partial = new File(this.target.getAbsolutePath() +
      TorrentByteStorage.PARTIAL_FILE_NAME_SUFFIX);

    if (this.partial.exists()) {
      logger.debug("Partial download found at {}. Continuing...",
        this.partial.getAbsolutePath());
      this.current = this.partial;
    } else if (!this.target.exists()) {
      logger.debug("Downloading new file to {}...",
        this.partial.getAbsolutePath());
      this.current = this.partial;
    } else {
      logger.debug("Using existing file {}.",
        this.target.getAbsolutePath());
      this.current = this.target;
    }


      this.raf = new RandomAccessFile(this.current, "rw");

    // Set the file length to the appropriate size, eventually truncating
    // or extending the file if it already exists with a different size.
    this.raf.setLength(this.size);

    this.channel = raf.getChannel();

    logger.debug("Opened byte storage file at {} " +
      "({}+{} byte(s)).",
      new Object[] {
        this.current.getAbsolutePath(),
        this.offset,
        this.size,
      });
    } finally {
      myLock.writeLock().unlock();
    }
  }
#vulnerable code 
                              public void open() throws IOException {
    this.partial = new File(this.target.getAbsolutePath() +
      TorrentByteStorage.PARTIAL_FILE_NAME_SUFFIX);

    if (this.partial.exists()) {
      logger.debug("Partial download found at {}. Continuing...",
        this.partial.getAbsolutePath());
      this.current = this.partial;
    } else if (!this.target.exists()) {
      logger.debug("Downloading new file to {}...",
        this.partial.getAbsolutePath());
      this.current = this.partial;
    } else {
      logger.debug("Using existing file {}.",
        this.target.getAbsolutePath());
      this.current = this.target;
    }

    this.raf = new RandomAccessFile(this.current, "rw");

    // Set the file length to the appropriate size, eventually truncating
    // or extending the file if it already exists with a different size.
    this.raf.setLength(this.size);

    this.channel = raf.getChannel();

    logger.debug("Opened byte storage file at {} " +
      "({}+{} byte(s)).",
      new Object[] {
        this.current.getAbsolutePath(),
        this.offset,
        this.size,
      });
  } 
                            #location 23 
                            #vulnerability type THREAD_SAFETY_VIOLATION