Complete HelloFalks example from article "Implementing a Language Server… How Hard Can It Be?" by Nipuna Marcus (thanks!), in particular Part 2 for the server component (with code cloned from here), and Part 3 for the VS Code extension part (with code cloned from here).
It all worked as explained with just a couple of very minor adjustments (like path to the jar).
Build server:
(cd hellols && mvn clean install)
Test VS Code plugin:
cd helloFalks
npm install
code .
F5