How to tell why a file deletion fails in Java?

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In Java 6, there is unfortunately no way to determine why a file cannot be deleted. With Java 7, you can use java.nio.file.Files#delete() instead, which will give you a detailed cause of the failure, if the file or directory cannot be deleted.

Note that file.list() may return entries for directories, which can be deleted. The API documentation for delete says that only empty directories can be deleted, but a directory is considered empty, if the contained files are e.g. OS specific metadata files.

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