[LSP] languageserver not working with vim/neovim+lsp plugins #1191
Description
The version I use is the prebuilt binary package downloaded from github release page, v1.30.1 omnisharp-mono.tar.gz. linux-x86_64 package behaves exactly the same. Here is the relevant configurations in my .vimrc:
let g:LanguageClient_serverCommands = {
\ 'cs': ['mono', '/opt/omnisharp-roslyn/OmniSharp.exe', '--languageserver', '--verbose'],
\ }
let g:LanguageClient_rootMarkers = {
\ 'cs': ['.git', '*.csproj'],
\ }
let g:deoplete#enable_at_startup = 1
let g:LanguageClient_loggingLevel = 'DEBUG'
let g:LanguageClient_loadSettings = 0
And here is the relevant log when error occurs:
17:31:24 INFO reader-cs src/vim.rs:379 <= Some("cs") {"protocolVersion":"2.0","method":"window/logMessage","params":{"type":4,"message":"Starting server..."}}
17:31:24 ERROR reader-cs src/vim.rs:384 Failed to deserialize output: data did not match any variant of untagged enum RawMessage
Message: {"protocolVersion":"2.0","method":"window/logMessage","params":{"type":4,"message":"Starting server..."}}
Error: ErrorImpl { code: Message("data did not match any variant of untagged enum RawMessage"), line: 0, column: 0 }
...
17:31:24 INFO main src/vim.rs:90 => Some("cs") {"jsonrpc":"2.0","method":"initialize","params":{"capabilities":{"textDocument":{"completion":{"completionItem":{"commitCharactersSupport":null,"documentationFormat":null,"snippetSupport":false},"dynamicRegistration":null}}},"initializationOptions":null,"processId":24814,"rootPath":"/home/shihira/Program/Unity/Vitruvius","rootUri":"file:///home/shihira/Program/Unity/Vitruvius","trace":"off"},"id":9}
Unhandled Exception:
Newtonsoft.Json.JsonSerializationException: Error converting value {null} to type 'System.Boolean'. Path 'params.capabilities.textDocument.completion.dynamicRegistration', line 1, position 221. ---> System.InvalidCastException: Null object cannot be converted to a value type.
at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in <cae080c8689e4af39d0ab2b313d012f5>:0
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType (Newtonsoft.Json.JsonReader reader, System.Object value, System.Globalization.CultureInfo culture, Newtonsoft.Json.Serialization.JsonContract contract, System.Type targetType) [0x000aa] in <dc86da7fc46c487ba6c7ab826da479cc>:0
--- End of inner exception stack trace ---
...
17:31:37 WARN main src/languageclient.rs:1910 Failed to start language server automatically. timed out waiting on channel
I noticed the key "protocolVersion", which is usually "jsonrpc" in many other LSPs. Is it the reason why LanguageClient failed to deserialize it?
Another problem causes the server crashing. I believe this is about what's been mentioned and solved in OmniSharp/csharp-language-server-protocol#75. If that's true please merge them.
Thank you for your great work.