On Mon, 8 Jun 2026 20:55:00 GMT, Justin Lu <[email protected]> wrote: > ListFormat validates patterns before passing them to MessageFormat, but it > currently allows single quotes as is. MessageFormat interprets these as > escaping syntax, which can lead to incorrect output. For example, given the > end pattern `"{0}'{1}'"` and an empty two pattern, a `ListFormat` formats > `List.of("foo", "bar")` as `"foo{1}"` instead of `"foo'bar'"`. > > This behavior violates the specification, as ListFormat does not define any > escaping mechanisms. This PR converts ListFormat patterns to the > corresponding MessageFormat pattern by ensuring all single quotes are > doubled, such that they are always treated literally by the MessageFormat. I > intentionally handle the replacement logic at the MessageFormat creation site > instead of the existing ListFormat validation, because the patterns should > remain exactly the same as the input given by the user. > > I am treating this as a normal bug fix since the current behavior violates > the specification and is incorrect. No one should be relying on this type of > behavior. However, I can file a CSR if deemed necessary. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai).
This pull request has now been integrated. Changeset: 7f62474f Author: Justin Lu <[email protected]> URL: https://git.openjdk.org/jdk/commit/7f62474fcb63392c61239c0a54ddea70002832ac Stats: 36 lines in 2 files changed: 29 ins; 0 del; 7 mod 8386200: ListFormat incorrectly escapes single quotes Reviewed-by: naoto ------------- PR: https://git.openjdk.org/jdk/pull/31430
