As I mentioned in another comment here, somebody gave a lightning talk about lsp-java [1] at Emacs Conf last year, which I thought looked promising. [1] https:

As I mentioned in another comment here, somebody gave a lightning talk about lsp-java [1] at Emacs Conf last year, which I thought looked promising. [1] https://emacsconf.org/2019/talks/19/ https://emacsconf.org/2019/talks/19/