Not sure how to install Lsp Server for kotlin mode.

[nedijahij]

I am trying to use kotlin lsp mode and i cannot make it work in kotlin mode. After install kotlin mode, then i tried to install kotlin server using npm but seem like it is not an npm package and now i could not figure out what should i do. Please give some instruction to install lsp server for kotlin.

[yyoncho]

The instructions on how to obtain the language server, linked from lsp-mode README are here: https://github.com/fwcd/KotlinLanguageServer

[mcraveiro]

Hi @yyoncho,

I managed to start the Kotlin server from the instructions above, but the problem is I can't seem to "link" it to emacs. I get the error:

LSP :: No LSP server for kotlin-mode.

Is there a document specifying how to point emacs to the LSP server?

Thanks for your time.

Marco

[yyoncho]

@mcraveiro Check *lsp-log*. You will see what lsp-mode is looking for.

In your case something like that would do the job:

  (add-to-list 'exec-path "~/kotlin-language-server/bin")

For other servers, we usually have a variable which can be used to point lsp-mode to the server location.

[mcraveiro]

Thanks @yyoncho. The log file says:

Command "kotlin-language-server" is not present on the path.
Command "kotlin-language-server" is not present on the path.

Also, I think also my problem is the name of the server; I have a script called local/KotlinLanguageServer-0.1.13/bin/server.sh. I'll try to update the server name too.

[mcraveiro]

Also, for what its worth, I found a lsp-kotlin project [1].

[1] https://github.com/whily/lsp-kotlin

[mcraveiro]

Ok, I've made some progress but not quite out of the woods yet. So now my *lsp-log* says:

Command "kotlin-language-server" is present on the path.
Found the following clients for SOME_FILE/HelloTest.kt: (server-id kotlin-ls, priority -1)
The following clients were selected based on priority: (server-id kotlin-ls, priority -1)

However, the server fails to start. In *kotlin-ls::stderr*, I see:

/usr/bin/emacs: PATH/local/KotlinLanguageServer-0.1.13/bin/kotlin-language-server: Exec format error

Process kotlin-ls stderr finished
/usr/bin/emacs: /home/marco/local/KotlinLanguageServer-0.1.13/bin/kotlin-language-server: Exec format error

I wonder if this is anything to do with the fact that kotlin-language-server is a bash script? The interesting thing is that running it from M-! works:

openjdk version "11.0.3" 2019-04-16
OpenJDK Runtime Environment (build 11.0.3+7-post-Debian-5)
OpenJDK 64-Bit Server VM (build 11.0.3+7-post-Debian-5, mixed mode, sharing)
Content-Length: 103

{"jsonrpc":"2.0","id":"1","method":"workspace/configuration","params":{"items":[{"section":"kotlin"}]}}Content-Length: 108

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"main      Connected to client"}}Content-Length: 118

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"client    System.in has closed, exiting"}}

The plot thickens...

[mcraveiro]

Ah actually, just a very very silly emacs user! :-) forgot to put the hash bang in shell script! For anyone else who may be looking for a script to start the kotlin server, mine is now as follows (kotlin-language-server):

#!/bin/bash
DIRNAME="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
APP_HOME=${DIRNAME}/..

# Add default JVM options here. You can also use JAVA_OPTS and
# SERVER_OPTS to pass JVM options to this script.
JAVA_EXE=/usr/bin/java
${JAVA_EXE} -version

CLASSPATH=${APP_HOME}/lib/server-0.1.13.jar:${APP_HOME}/lib/j2k-1.3.11-release-272.jar:${APP_HOME}/lib/kotlin-plugin-1.3.11-release-272.jar:${APP_HOME}/lib/shared.jar:${APP_HOME}/lib/org.eclipse.lsp4j-0.5.0.jar:${APP_HOME}/lib/org.eclipse.lsp4j.generator-0.5.0.jar:${APP_HOME}/lib/org.eclipse.xtend.lib-2.17.0.jar:${APP_HOME}/lib/org.eclipse.xtend.lib.macro-2.17.0.jar:${APP_HOME}/lib/org.eclipse.xtext.xbase.lib-2.17.0.jar:${APP_HOME}/lib/guava-21.0.jar:${APP_HOME}/lib/kotlin-compiler-1.3.11.jar:${APP_HOME}/lib/kotlin-reflect-1.3.11.jar:${APP_HOME}/lib/fernflower-1.0.jar:${APP_HOME}/lib/kotlin-stdlib-1.3.11.jar:${APP_HOME}/lib/org.eclipse.lsp4j.jsonrpc-0.5.0.jar:${APP_HOME}/lib/kotlin-script-runtime-1.3.11.jar:${APP_HOME}/lib/kotlin-stdlib-common-1.3.11.jar:${APP_HOME}/lib/annotations-13.0.jar:${APP_HOME}/lib/gson-2.7.jar

# Execute server
"${JAVA_EXE}" -classpath "${CLASSPATH}" org.javacs.kt.MainKt

I used the packages directly from the official github project [1], which may be a tad old.

[1] https://github.com/fwcd/KotlinLanguageServer/releases

[yyoncho]

@mcraveiro so you are good?

As a side note, it would be good if we do the server downloading automatically - so if you are interested in contributing to lsp-mode you may give it a try. Here it is a PR for lsp-python-ms - emacs-lsp/lsp-python-ms#37 .

[mcraveiro]

@yyoncho I have managed to get the kotlin server to connect to emacs, but now my problem is that I am getting errors that I do not see when I manually run gradle. I shall investigate those, and then update this ticket with a full set of instructions on how to get kotlin working. I will also look into the PR above and see how hard it is to integrate it all. If it is within my limited skillset, I'll open a PR :-) Thanks for your help.

[dj8yfo]

@yyoncho kotlin lsp kind of starts, but it's not too useful. *Messages*:

LSP :: Connected to [kotlin-ls:10236 status:starting].
error in process filter: while: Symbol’s value as variable is void: spacemacs-jump-handlers-kotlin-mode
error in process filter: Symbol’s value as variable is void: spacemacs-jump-handlers-kotlin-mode
LSP :: Internal error. [6 times]
No jump handler was able to find this symbol.

[yyoncho]

@gisochre

Do (spacemacs|define-jump-handlers 'kotlin-mode)

[dj8yfo]

@yyoncho thanks. That helped, lsp-mode became mostly functional 👍

[mcraveiro]

Actually, I'm still struggling to get KLS to work correctly, though I do not think its an emacs problem. I've taken it to the KLS developers [1]. I'll update this ticket once I get to the bottom of it. Thanks a lot for your help.

[1] fwcd/kotlin-language-server#126