Clojurians Log v2

Much appreciated sir!

nice. I tested it with bb too:

Thank for testing it with bb too 🙌 Any feedback is welcome 😊

Very awesome. I usually use #garden for this, but a separate lib makes total sense. I don’t see Garden in your list of inspirations, so maybe you have yet another source to get inspiration from? 😃

(Note that Garden is being maintained by #lambdaisland these days.)

they have a maintained fork, so probably the defacto version. there's not a mention of it in the original repo though

(and that fork was made bb-compatible too, how nice :))

I didn’t look to Garden, I didn’t know that it has color manipulation functions. I’ll take a look in case I see something I can include. Thank you @pez !!

btw @jonurnieta - since this is the first version, what does > • Backward Compatible: All existing string/vector-based APIs continue to work mean in the readme?

also the README mentions some things that are "still supported". Still supported compared to?

I had some previous versions that they were used only by me. I added that when I added the Color record that previously didn’t exist. So you’re right, I will change it. Thanks @borkdude !

around 760 lines of pretty straight forward readable code incl. comments, nice 👍

Thank you @azimpel ! Feel free to give any suggestion 😊

Java has been on fire in the last few years to be honest.

I'm curious to try this: java -XX:AOTCacheOutput=app.aot -cp app.jar ... The ergonomics have really improved from when I tried app CDs a while back. Does anyone know if this caches more things than what app CDs used to cache?

yes, they are now caching profiling info (branch prediction etc)

they're also doing a much better job of caching the post-linked references

if you're willing to properly warm it up, it can be a big win. but the time and effort of course to do that have to be really worth the startup time payback at prod time

still pretty awkward in dev envs

A reminder that if you don't want to install JDK from Oracle and too impatient to want to wait for Temurin, Zulu binaries are already available from Azul: https://www.azul.com/downloads/?package=jdk#zulu. They are a reliable OpenJDK binaries provider.

@alexmiller Is there any guidance related to the SequencedCollection issue? We had faced this issue when we wanted to switch to Java 21, but then had to downgrade to 17. Ref: https://aphyr.com/posts/369-classnotfoundexception-java-util-sequencedcollection

You should AOT compile targeting the minimum Java version you intend to run on.

That is just generally true - when Clojure code is compiled, Java method and class resolution is done in terms of the JDK available. If you compile with one version and run with a lesser version, you may find classes or methods don’t exist

There is a specific issue with deftype/defrecord default methods that makes this particularly pointy (we have been working on that) but the general case is still true regardless

Thanks @alexmiller!

Yes

I tried Zulu25 and traced a new error that appeared to this difference:

;; Zulu 21
; clojure -M -e '(.exists (clojure.java.io/file ""))'
false

;; Zulu 25
; clojure -M -e '(.exists (clojure.java.io/file ""))'
true

Oracle 25 also behaves like Zulu 25

Ran these in the same empty folder (bar .cpcache)

https://bugs.openjdk.org/browse/JDK-8024695

looks like it was considered a bug that got fixed with 25

An anecdotal report: switching from v22 to 25 produced roughly 50% performance improvement. The work is parsing XML, producing relationship information that gets loaded into neo4j. The code heavily relies on transducers

Wow, that's amazing numbers

Yeah, I was very pleasantly surprised

That’s worth trying. Anybody found any negatives, or is it all upside at as far as we know at this point?

Zulu also available via Brew on MacOS.

I should provide an update: It seems my app had a lot of reflection. It’s possible that jvm 25 does a much better job of handling reflection than previous versions. As with everything, ymmv

yeah, they've rewritten the reflection impl to use method handles