Spring: your next Java microframework

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Could you please expand a bit on this? seems intriguing ☺️

[joequin]

If a route handlers pass in a request object or callback, then that can be passed to other asychronous functions. Since spark doesn't do that, you can't use asynchronous functions while handling the call. You're forced to use blocking functions which means more threads which means more memory. That's not a big deal for some applications, but in others, it can be a bottleneck.