How to Lock a File in Java to Prevent Concurrent Access?

File Locking in Java

Q: How can I lock a file in Java to prevent access by other processes?

A:

To prevent another process from accessing an open file, use the FileChannel.lock() method. Here's how:

try (
    FileInputStream in = new FileInputStream(file);
    FileLock lock = in.getChannel().lock();
    Reader reader = new InputStreamReader(in, charset)
) {
    ...
}

The FileLock object obtained from lock() represents the acquired lock. Keep in mind that locking behavior may vary across different platforms, as noted in the FileLock API documentation.

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