Java

Installation

1. Install Eclipse JDT Language Server
2. Create executable jdtls in path, with content:

#!/usr/bin/env sh

server={{ your server installation location }}

java \
    -Declipse.application=org.eclipse.jdt.ls.core.id1 \
    -Dosgi.bundles.defaultStartLevel=4 \
    -Declipse.product=org.eclipse.jdt.ls.core.product \
    -noverify \
    -Xms1G \
    -jar $server/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.*.jar \
    -configuration $server/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux/ \
    "$@"

3. Add to your vim config:

let g:LanguageClient_serverCommands = {
    \ 'java': ['jdtls'],
    \ }

All folders should be absolute.