JDT - Stuck on "Configuring Lang. Server". Thread Dump/JFR profile shows threads in wait state, no activity

[GavinRay97]

I have a Quarkus extension project which seems to be the only project this is (and has ever) happening with.
The language server never fully initializes.

Almost everything works. What doesn't work:

• Syntax highlighting on imports
• Formatting, sort imports on save, other similar action
• Ctrl + Click to jump to definition on non JRE methods (any external libraries)

👇 CLICK TO SEE SCREENSHOTS 👇

I tried to debug to the limits my (very limited) experience with Java/the JVM would allow

Investigated with VisualVM -- thread dumps, profiling, and JFR.
Appears like the application + over half of it's threads are in a wait state

Here is the project source and a very lengthy JFR recording:

• quarkus-scala3.zip
• eclipse-jdt-vscode-java-jfr-snapshot.zip

NOTE: Also why in the JFR snapshot does the JDT server persistently send network requests to a local docker network URL?

Environment

• Operating System:

  • Edition	Windows 11 Home
    Version	21H2
    Installed on	‎7/‎11/‎2021
    OS build	22000.100
    Experience	Windows Feature Experience Pack 421.18901.0.3
    

• JDK version:

  • $ java --version
    openjdk 16.0.2 2021-07-21
    OpenJDK Runtime Environment GraalVM CE 21.2.0-dev (build 16.0.2+4-jvmci-21.2-b02)
    OpenJDK 64-Bit Server VM GraalVM CE 21.2.0-dev (build 16.0.2+4-jvmci-21.2-b02, mixed mode, sharing)

• Visual Studio Code version:

  • 

• Java extension version:

  • v0.80.0

Steps To Reproduce

1. Maybe have my exact environment?
2. Try to open the project
3. Or don't. I wouldn't blame you. This seems like a nightmare to try to reproduce and maybe not worth the effort

[Please attach a sample project reproducing the error]
Please attach logs

Additional Informations

• Main thread just waiting indefinitely I think is what this is saying?

  • 

• From JFR snapshot, it seems to be stuck in a wait, here in the callstack:

  • 
  • 

• Also, for some reason there is a bunch of network activity to a local Docker network. What's going on with that?

  • 
  • 

[snjeza]

Java extension version:
v0.80.0

@GavinRay97 Could you check #2020 (comment) ?

[GavinRay97]

That looks like the exact problem, thank you!!

Specifically, these lines in diff appear to be the fix: