You may be able to use FileChannel's tryLock() method for this. It's not 100% reliable, and it depends on the operating system. But if this method returns null, it indicates that some other process is working with the file. If it returns a FileLock object, then
to the best of our knowledge, the file was not being accessed by another process, and the JVM now has exclusive access to the file. I'd recommend
testing this on whatever OS you're using to see how well it works in practice.
