Disclaimer: This article probably seems shorter than you have expected regarding its title. In the end you will have learned that it's not.
Spring...
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I agree with your analysis and I think that Spring Boot is not the best way to learn Spring. I see it more as a way to help Spring developers to go faster when they bootstrap their Spring application. Indeed, without prior Spring knowledge, you end up doing pretty nasty stuff...
I agree as well. deploying a spring boot project as is, is good for quick development but will take some more configuring and tuning before throwing it in a prod-like an environment.
Even constant RTFM does not guarantee lack of nasty surprises with Spring. Eventually comes understanding that use of Spring is counterproductive.
A guide which tells me nothing but everything I already knew.
Very helpful. I am thrilled for you being in the community.