When connecting to sbt server for Scala files, Language-Server fails when deoplete is turned on.

[spf3000]

• Did you upgrade to latest plugin version?
• Did you upgrade to/compile latest binary? Run shell command bin/languageclient --version to get its version number.
• (Neovim users only) Did you check output of :checkhealth LanguageClient? Y
• Did you check troubleshooting ? Y

Describe the bug

When connecting to sbt server for Scala files, Language-Server fails when deoplete is turned on.

Environment

Nvim version: NVIM v0.3.0

• This plugin version: 605c07e
• This plugin's binary version (bin/languageclient --version): languageclient 0.1.110
• sb-server-stdio.js: https://gist.githubusercontent.com/eed3si9n/0ee26a15218f1d4031b451dd61315d6c/raw/5693fbcafbb9a71f1ac5a9d13ace94df3b091cbc/sbt-server-stdio.js
• Minimal vimrc content:

  
  call plug#begin()
  Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
  Plug 'autozimu/LanguageClient-neovim', {
  \ 'branch': 'next',
  \ 'do': 'bash install.sh',
  \ }
  call plug#end()

augroup filetype_scala autocmd! autocmd BufReadPost *.scala setlocal filetype=scala augroup END

" Always draw sign column. Prevent buffer moving when adding/deleting sign. set signcolumn=yes

let g:LanguageClient_serverCommands = { \ 'scala': ['node', expand('/usr/local/bin/sbt-server-stdio.js')] \ } let g:deoplete#enable_at_startup = 1

## To Reproduce
Steps to reproduce the behavior:
0. Create/Fetch example project ... https://github.com/spf3000/huts-api
0. Install sbt 1.0 or later 
1. cd into huts-api directory
1. execute sbt
(In another terminal window)
0. cd into huts-api directory
1. Type some errors
2. :w 

## Current behavior
Errors markings are displayed when opening a file containing errors and typing :w. However when you type a new error there is no error symbol displayed.  This only occurs once I plug in deoplete - it is working fine without it.  I have added some relevant error messages below.
## Expected behavior
Error symbols should be displayed when you type an error and then write the file.

##ERROR MESSAGE:
14:22:12 ERROR main src/vim.rs:59 Error handling message: timed out waiting on channel                                                                                              

  Message: {"jsonrpc":"2.0","method":"languageClient/omniComplete","params":{"buftype":"","character":3,"filename":"/home/atlantic-development-operations/dev/projects/XmlConverter/sr
  c/main/scala/com/elsevier/entellect/xml-transform-api/XmlRecurse.scala","handle":false,"languageId":"scala","line":20},"id":1}                                                      

  Error: Timeout      

[autozimu]

Please try increase the timeout setting https://github.com/autozimu/LanguageClient-neovim/blob/5e968547dea733a25de74c1f9babd9e77459598a/doc/LanguageClient.txt#L261-L267

[spf3000]

@autozimu I set it to 30 - still same problem - timeout. I got it working by switching to ncm2 instead of deoplete - even if I don't understand what the issue was still. I know sbt-server is not going to give you completions - so perhaps there is an issue with using a server without completions when paired with deoplete?

[autozimu]

Seems like because language server doesn't support completion and doesn't respond timely, language client keeps waiting until timing out, which blocks processing other messages.