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There are lighter options in java world, my dropwizard server with JDBI starts in 1.2sec.

I'm genuinely unsure if this is a joke. If you're running that on a modern computer, your server is spending billions of clock cycles starting up. What on Earth is it doing? :)

If I write a Go server, I'm unhappy if it takes more than 0.2 seconds to start.

Depends what your server is doing, java app binded to http port will take probably same amount of time.

My dropwizard server contains almost all possible batteries: ssl, logging, http filters, static content, metrics, DB connection pooling, static content serving, all kinds of URL parameter parsing and URL routing, DI framework, ORM, thread pooling. I think it just inspects and initializes all this data structures in memory, load libraries and classes, etc.

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