How to atomically rename a file in Java, even if the dest file already exists?

Question

I have a cluster of machines, each running a Java app.

These Java apps need to access a unique resource.txt file concurently.

I need to atomically rename a temp.txt file to resource.txt in Java, even if resource.txt already exist.

Deleting resource.txt and renaming temp.txt doesn't work, as it's not atomic (it creates a small timeframe where resource.txt doesn't exist).

And it should be cross-platform...

Thanks !

question from:https://stackoverflow.com/questions/595631/how-to-atomically-rename-a-file-in-java-even-if-the-dest-file-already-exists

Answer 1

For Java 1.7+, use java.nio.file.Files.move(Path source, Path target, CopyOption... options) with CopyOptions "REPLACE_EXISTING" and "ATOMIC_MOVE".

See API documentation for more information.

For example:

Files.move(src, dst, StandardCopyOption.ATOMIC_MOVE);