I'm no heavy user, but every time I need to code java I use lsp-java and since before clojure I used to use Eclipse itself to code Java, the experience is pretty the same but on emacs which is better :p

Also, the Eclipse LSP server is a reference for other lsp servers, it has lots of cool java features, so if you already use another LSP for other lang, you will probably like it as well

yyoncho is, or was at least. Check out lsp-java https://github.com/emacs-lsp/lsp-java