My biggest issue with Spring was, and likely still is since it hasn't been that long, the documentation around annotations. If a framework is going to go all in

My biggest issue with Spring was, and likely still is since it hasn't been that long, the documentation around annotations. If a framework is going to go all in on magic annotations to define things, the documentation surrounding those annotations better be really good so people can learn how to use them properly and how they work so you can debug issues when they occur. However my experience with Spring was that finding any good documentation was impossible except for very basic understanding of a select few annotations. Not to mention that when there is an issue, you get a 30+ line stack-trace that usually tells you nothing useful unless you've had the same issue before and can correlate the error with its solution.