Linux OpenJDK 8中RandomAccessFile.close释放全进程文件锁问题咨询

API 探路者

2026-8-20

文件锁释放异常问题排查与疑问

排查Bug时发现：当线程B调用RandomAccessFile.close()（在RandomAccessFile.getChannel().tryLock()调用失败后），该操作会释放JVM进程内其他线程（如线程A）持有的文件锁，甚至可能关闭目标文件的所有打开流。

示例代码

public class Locker {
  static FileLock lockFile(String path) {
    try {
      RandomAccessFile f = new RandomAccessFile(path, "rw");
      try {
        FileLock lock = f.getChannel().tryLock();
        return lock; // Thread-A gets the lock
      }
      catch(OverlappingFileLockException | IOException ex) {
        f.close(); //Thread-B fails and closes, but this also releases the lock of Thread-A
        return null;
      }
    }
    catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  public static void main(String[] args) throws Exception {
    final String path = args[0];
    Thread t1 = new Thread(() -> lockFile(path));
    Thread t2 = new Thread(() -> lockFile(path));
    t1.start();
    t2.start();
    t1.join();
    t2.join();
  }
}