FileChannel rollback question

[M Burke]

When FileChannel calls the transferFrom() method, if it fails in the middle somewhere, does it rollback it's changes?

[Jim Yingst]

Unlikely. If you're concerned about this, I'd recommend copying the bytes to a tempfile first. If the transferFrom completes successfully, then close the FileChannel and rename the file to whatever name you originally wanted it to have. If a problem occurs during the transfer, simply delete the tempfile afterwards.

[M Burke]

I would do that, but I need to append.

There is a method in FileChannel called force(), it is suppose to make recovery possible. But it throws an exception, "Access is denied".