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clojure 2026-07-02
oyakushev 2026-07-02T15:37:40.154079Z
This surprised me today:
// JDK25:
user=> (format "%,.2f" 12345.0)
"12,345.00"
// JDK26:
user=> (format "%,.2f" 12345.0)
"12 345,00"format in JDK26 now uses my system locale (being en_UA) instead of some default/compat one.
Sadly enough, you can't customize a locale in format, have to use String/format instead.💥 6
👀 1
It looks like JDK 26 changed the formatting for en_UA
Given localetest.clj:
(println "Java version" (System/getProperty "java.runtime.version") (System/getProperty "java.vendor"))
(println "format with en-ua" (String/format (java.util.Locale. "en" "UA") "%,.2f" (to-array [12345.0])))$ sdk use java 25.0.3-tem
$ clojure -M localetest.clj
Java version 25.0.3+9-LTS Eclipse Adoptium
format with en-ua 12,345.00
$ sdk use java 26.0.1-tem
$ clojure -M localetest.clj
Java version 26.0.1+8 Eclipse Adoptium
format with en-ua 12 345,00Probably this change: https://www.oracle.com/java/technologies/javase/26all-relnotes.html#JDK-8354548
👍 1
Alex Miller (Clojure team) 2026-07-02T15:42:15.759319Z
I think they got rid of compat as of Java 23
oyakushev 2026-07-02T15:43:38.717049Z
Like I've said, it still works the old way up until 25 (on my machine). Or do you mean something else?
Alex Miller (Clojure team) 2026-07-02T15:44:22.186559Z
that must be a different change then
oyakushev 2026-07-02T15:44:54.182589Z
It looks related indeed, maybe they extended the migration period or something.
Jim Newton 2026-07-02T17:56:08.236039Z
yipee!!!! my talk was accepted at clojure conj. Clojure in Academia
👏 9
👏🏻 1
🎉 30
