Java LS should lock its workspace

[snjeza]

Steps to reproduce:

• start Java LS in Che 7
• open a Che 7 workspace in two browser's tabs
• log in to the plugins sidecar

You will see that the Java LS server has been started twice in the same workspace.

[tsmaeder]

How does VSCode Java prevent this?

[snjeza]

How does VSCode Java prevent this?

VSCode prevents this, but not VSCode Java.