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Posted to issues@commons.apache.org by "Elliotte Rusty Harold (Jira)" <ji...@apache.org> on 2023/10/03 14:48:00 UTC

[jira] [Created] (IO-814) FileUtils.deleteDirectory can throw UncheckedIOException

Elliotte Rusty Harold created IO-814:
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             Summary: FileUtils.deleteDirectory can throw UncheckedIOException
                 Key: IO-814
                 URL: https://issues.apache.org/jira/browse/IO-814
             Project: Commons IO
          Issue Type: Bug
    Affects Versions: 2.14.0, 2.13.0
            Reporter: Elliotte Rusty Harold


This was a behavior breaking change, and an incorrect one to boot. 

Operations that can have I/O errors should throw IOException if they can't directly handle the I/O error. UncheckedIOException is not a reasonable alternative.

A method that can neither handle nor throw IOException must not perform I/O operations.

It's worth noting that functional programming, not just in Java but in general, does not allow I/O. As soon as a method performs I/O, it's no longer a pure function and should not be written in a functional style. 



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