Change file owner group under Linux with java.nio.Files

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Thanks Jim Garrison for pointing me in the correct direction. Here the code, which finally solved the problem for me.

Retrieve the group owner of a file

File originalFile = new File("original.jpg"); // just as an example
GroupPrincipal group = Files.readAttributes(originalFile.toPath(), PosixFileAttributes.class, LinkOption.NOFOLLOW_LINKS).group();

Set the group owner of a file

File targetFile = new File("target.jpg");
Files.getFileAttributeView(targetFile.toPath(), PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS).setGroup(group);

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