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Disclaimer: I love writing production systems in Java. I was a C++ programmer for 10 years before moving to Java about 15 years ago. Java offers a virtually all in one package when writing large systems. You have a single language where you can write code that doesn't care to be the fastest possible, and you just rely on ZGC to do its thing, and it works. Or you can write GC free code with a mostly quite performant SoA type approach. You can do this in the same codebase, and developers don't need to know different languages to write either style of code. You then have one build system, one deployment system, an incredible set of observability tooling, etc, etc.

So I might be biased, but with the correct curation of AGENTS.md files and skills, we're getting extremely good results using Claude Code writing Java.

Another disclaimer: I haven't tried with another language, but we're happy with the results.

by sgt2 hours ago|

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Would be interesting to find out what kind of production systems you write in Java and how you deploy / scale them. What DB backends you use, caching, etc. And whether you're also on Spring.

by munksbeer2 hours ago|

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Always finance, trading systems. In the last 15 years mostly what they call "front office".

At the moment, for the place I work, we deploy on AWS mostly (because that is where our target trading venues often are). DB backends are largely not something we think about too much, because all of that is done out of band of course as a final state. Our main persistence is through our "bus" using aeron, and everything starts and recovers from there. This is not your typical enterprise java. No Spring.

by sgt1 hours ago|

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Ok that's quite interesting. Am I correct to presume this is crypto trading? I was under the impression most regular HFT is near the exchanges, or physically at the exchange in a DC. Unless it's an AWS Outpost or something.

by DonHopkins3 hours ago|

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The reason why Java is such a terrible choice now is not technical, it's the Lawnmower Nazi argument:

https://news.ycombinator.com/item?id=15886728

masklinn on Dec 9, 2017 | parent | context | favorite | on: Larry Ellison allegedly tried to have a professor ...

And remember,

> Do not fall into the trap of anthropomorphising Larry Ellison. You need to think of Larry Ellison the way you think of a lawnmower. You don't anthropomorphize your lawnmower, the lawnmower just mows the lawn, you stick your hand in there and it'll chop it off, the end. You don't think 'oh, the lawnmower hates me' -- lawnmower doesn't give a shit about you, lawnmower can't hate you. Don't anthropomorphize the lawnmower. Don't fall into that trap about Oracle. — Brian Cantrill (https://youtu.be/-zRN7XLCRhc?t=33m1s)

And

> I actually think that it does a dis-service to not go to Nazi allegory because if I don't use Nazi allegory when referring to Oracle there's some critical understanding that I have left on the table […] in fact as I have said before I emphatically believe that if you have to explain the Nazis to someone who had never heard of World War 2 but was an Oracle customer there's a very good chance that you would explain the Nazis in Oracle allegory. — also Brian Cantrill (https://www.youtube.com/watch?v=79fvDDPaIoY&t=24m)

by sgt3 hours ago|

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Sure, I don't like Oracle either but Java has moved beyond that years ago. There's a thriving community that does not rely on Oracle.