Connecting to LSP has no effect in Eglot

[seb-hyland]

Hi! In Emacs, I am leveraging Nextflow mode for syntax highlighting, and have tried to use this LSP unsuccessfully with Eglot. I used the following simple configuration:

(add-to-list 'eglot-server-programs '(nextflow-mode . ("java" "-jar" "/path/to/language-server-all.jar")))

Eglot reports a successful connection, with the following message in eglot-events-buffer (I use emacs_lsp_booster to speed up Eglot):

[stderr]  [2025-03-16T19:09:28Z INFO  emacs_lsp_booster::app] Running server "java" "-jar" "/path/to/language-server-all.jar"

and the *Messages* buffer reports the following for a test project:

[eglot] Connected! Server `EGLOT (nextflow-test/(nextflow-mode))' now managing `(nextflow-mode)' buffers in project `nextflow-test'.

However, no LSP capabilities are functional. I can't seem to get completion, eldoc, or other features like rename/jump-to-definition, etc.
Has anyone gotten this LSP to work with Eglot?

[bentsherman]

I would consult the folks in #56 as they might have some pointers