[IO-814] FileUtils.deleteDirectory can throw UncheckedIOException - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Critical
Resolution: Fixed
Affects Version/s: 2.13.0, 2.14.0
Fix Version/s: 2.15.0
Component/s: None
Labels:
None

Description

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.