alt Hacker NewsDoes this app take 5 minutes to start? That's so much dynamic Spring magic. Also, how do you keep track of control flow when anything at anytime could have been overridden by something else? It seems like tracing and debugging this thing would be like exploring someone else's codebase every time.
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Who cares about startup times if apps is started only when new version is deployed?
And 5 minutes is a bit long, maybe someone is doing some database operations during start?
> It seems like tracing and debugging this thing would be like exploring someone else's codebase every time.
Oh man, just wait till you start sprinkling some AOP in there. My debugger is damn near useless sometimes as I try to follow bizarre paths between parts of my code.
The article talks about a specific solution they came up with. No way is this a representative example, they discard a typical pattern way at the top.
The class loading magic means you need to be exceptionally careful about things that would otherwise be very innocuous. It’s the rule, not the exception - that your average spring boot app will be doing tons of expensive stuff at startup. Most of which is unnecessary and was not even intended.
The JVM doesn’t need this kind of thing either, and it gets a bad wrap from the J(2)EE days, and the “simple” replacement that Spring was supposed to be.
No doubt there’s some benefits to be had, but I don’t think the trade-offs are worth it, especially at larger scales.