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Similar story: started on IDEs (to wit: Netbeans) roughly 13 years ago in 2011, started using Vim around 2013-2014, switched to GNU Emacs in 2019. Other than Netbeans I've used IDEA and Eclipse for Java development; but I just love Emacs. It's so nice to be able to tell my editor what to do when I need it to do something and to be able to teach it to do what I need.

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I'd love to use Emacs for Java development, but I feel that IDEA is almost a necessity for professional Java/Spring development

I think lsp integration[0] can get you pretty far, but also if you use LLM features a la Copilot, I use ellama[1] for that. If there are other features you think you will miss, maybe I can ease your mind about those as well :)

[0] https://github.com/emacs-lsp/lsp-mode

[1] https://github.com/s-kostyaev/ellama

I used Eclim (https://github.com/emacs-eclim/emacs-eclim) for a bit, but I'm guessing, like the sibling comment said, that the current preferred solution would be to use LSP.

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