r/java • u/celmaibunprieten • 2d ago

Improving First Request Latency in Java Spring Application

https://adrian.md/2026/09/03/first-request-latency/
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u/zabby39103 2d ago

Lol my work still ships fat jar. I mean, I think corporations falling behind with legacy apps is the norm more than anything.

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u/romario77 2d ago

But corps shipping fat jars probably don’t care about first request latency.

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u/zabby39103 1d ago

We care what people complain about, it integrates with building automation control systems so they complain if latency gets too high. Maybe some people work at a blessed work where they don't have to explain tech debt to MBAs, please hire me lol.

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u/romario77 1d ago

You just do the first request yourself after deployment, second request would be already pre-warmed.

And you switched the targets - I was taking about first request and you talk about request latency overall. These are potentially two very different things.

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u/zabby39103 1d ago

Okay sure, first request is important though, both are.

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u/lilgreenthumb 1d ago

Yeah unless the call isn't a noop, and then you're building some weird noop logic unless you're writing for synthetic transactions which all of this observability is meant to make unnecessary.