Julia language server failing to initialize

[Jarrod-Angove]

I apologize if I make any mistakes here, this is the first time I've reported something like this. Each time I open a julia file in nvim, the julia language server fails to initialize. This error is provided:

[coc.nvim] The "julia" server crashed 4 times in the last 3 minutes. The server wil l not be restarted.

I am running nodejs v16.14.0 and julia 1.7.3 on fedora 36. It may be worth noting that other language servers run without issue. Looking into the coc logs shows the following:

2022-08-08T13:06:21.649 INFO (pid:10173) [plugin] - coc.nvim initialized with node: v16.14.0 after 78ms 2022-08-08T13:06:24.895 INFO (pid:10173) [services] - registered service "julia" 2022-08-08T13:06:24.896 INFO (pid:10173) [services] - Julia Language Server state change: stopped => starting 2022-08-08T13:06:24.901 INFO (pid:10173) [language-client-index] - Language server "julia" started with 10232 2022-08-08T13:06:24.927 INFO (pid:10173) [services] - Julia Language Server state change: starting => stopped 2022-08-08T13:06:24.927 INFO (pid:10173) [services] - Julia Language Server state change: stopped => starting 2022-08-08T13:06:24.931 INFO (pid:10173) [language-client-index] - Language server "julia" started with 10234 2022-08-08T13:06:24.942 INFO (pid:10173) [services] - Julia Language Server state change: starting => stopped 2022-08-08T13:06:24.942 INFO (pid:10173) [services] - Julia Language Server state change: stopped => starting 2022-08-08T13:06:24.946 INFO (pid:10173) [language-client-index] - Language server "julia" started with 10236 2022-08-08T13:06:24.957 INFO (pid:10173) [services] - Julia Language Server state change: starting => stopped 2022-08-08T13:06:24.957 INFO (pid:10173) [services] - Julia Language Server state change: stopped => starting 2022-08-08T13:06:24.961 INFO (pid:10173) [language-client-index] - Language server "julia" started with 10238 2022-08-08T13:06:24.973 INFO (pid:10173) [services] - Julia Language Server state change: starting => stopped 2022-08-08T13:06:24.973 ERROR (pid:10173) [services] - Server julia failed to start: Error: Connection to server got closed. Server will not be restarted. at Zf.handleConnectionClosed (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:236:1006) at Zf.handleConnectionClosed (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:236:28588) at t (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:236:386) at xN.invoke (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:9670) at Md.fire (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:10436) at xi (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:37:10897) at xN.invoke (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:9670) at Md.fire (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:10436) at OS.fireClose (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:12716) at Socket.<anonymous> (/home/jangove/.local/share/nvim/plugged/coc.nvim/build/index.js:36:14275)

I have been trying to get coc-julia working with nvim for a while, but this problem has persisted between multiple operating system installs and multiple attempts to reinstall both coc and coc-julia. I'm sure I'm missing something simple here, but I'd really appreciate some help.

[fannheyward]

The Julia language server can't start on your env.

[Jarrod-Angove]

Thanks for your reply! Do you know which part of an env might prevent the server from starting?

[wangl-cc]

There are many possible. I think you can check if the LanguageServer is installed well firstly:

julia --project=~/.config/coc/extensions/node_modules/coc-julia/server/JuliaLS -e "using LanguageServer"

[limarta]

I ran into this same issue as well. When I ran the julia command above with the appropriate environment, the server immediately closed as soon as using LanguageServer finished executing. I suspect this causes the lsp on nvim's side to fail.

[limarta]

I resolved the issue by using the manual configuration option provided by Coc: { "languageserver": { "julia": { "command": "/usr/local/bin/julia", "args" : ["--startup-file=no", "--history-file=no", "-e","using LanguageServer; runserver()"], "filetypes": ["julia"] } } }

A couple of points to note:

• Use the correct path to your Julia executable
• CoC executes Julia with the passed args. Note that -e imports the LanguageServer package and creates the server. If you notice that Julia immediately exits when running the command in isolation, check to see if you have runserver().