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Thursday, March 19, 2026

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01:09:02klfList <Integer> numList =Arrays.asList("2383".split("")).stream().map(Integer::parseInt).toList()
01:09:43klfparseInt returns a (primitive) int, and not an Integer instance.
01:10:59klfwhy does the above java code works without first turning the returned int into an Integer instance?
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01:24:06jreicherklf: What makes you think it's not doing that?
01:26:22klfif it does, then it is not apparent to me from that line of code, which is why I come to ask about it.
01:26:44jreicherhttps://docs.oracle.com/javase/tutorial/java/data/autoboxing.html
01:26:44javabotjreicher's title: "Autoboxing and Unboxing (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)"
01:26:45nevetAutoboxing and Unboxing (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)
01:26:48jreicherMaybe you are unaware of this?
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01:38:20klfI see.
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02:00:04jreicherklf: It's a good question, by the way, because autoboxing in a situation like this is a performance hit.
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15:54:48Swayzepeformance is only a concern if you're doing millions of requests per second or have some kind of reason to care?
15:56:02dreamrealSwayze: what?
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20:41:57jbosmansif the main performance concern is the impact of autoboxing, someone's either doing a very good or a very bad job :-)
20:46:31ParaAutoboxingFactory
20:53:09jbosmansloll
20:54:22ParaHere's something that's kinda insane, Clojure REPL which hooks into a running Spring Boot app, allowing live rewrites of functionality. And it's being driven through Claude, so check the video/terminal recording. https://brdloush.github.io/livewire/
20:54:23javabotPara's title: "Livewire — Live nREPL wire into your Spring Boot app"
20:54:23nevetLivewire — Live nREPL wire into your Spring Boot app
20:54:46ParaMentioning Clojure here feels a bit silly, as it's entirely LLM prompting, but anyhoos.
20:55:17ParaYou can still run Clojure REPL stuff with it of course, but I guess the future is now and I'm the old man.
21:03:59jbosmansagree, impressive
21:04:42jbosmansdon't see myself using it yet on any main projects yet tho, so I'm the old man :)
21:05:22jbosmanscould be nice to try on a small hobby project in a sandboxed env
21:08:46ParaFWIW nREPL protocol does support ssh keys and all, so figure out how to enable that over the socket well before deploying... :)
21:10:31jbosmansi guess i would only use it in a dev setting anyway
21:11:12jbosmanshah it's at the bottom of the page: "Dev only. Not for production. You've been warned."
21:17:57jreicherjbosmans: I think I understand why you say that, but I'm not sure it's completely true. I can imagine someone making a mistake with a very large generic list of integers, iterating over them all and modifying them. They might be confused why it takes longer than they expect.
21:24:52jbosmanshopefully if it's down to that (or all about that), same someone might look into some dedicated libs for dealing with large primitive collections etc
21:25:09jbosmansand i guess value classes might soonish help out too
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