Existing solution for file deltas/versioning in Java

When versioning or optimizing file backups one idea is to use only the delta or data that has been modified.

This sounds like a simple idea at first but actually determining where unmodified data ends and new data starts comes accross as a difficult task.

Is there an existing framework that already does something like this or an efficient file comparison algorithm?


XDelta is not Java but is worth looking at anyway. There is Java version of it but I don’t know how stable is it.

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