Unable to add external jar to work with LSP

I'm using Visual Studio Code for a Java project without build tools (e.g., Maven or Gradle). I've added JAR files using the java.project.referencedLibraries setting. While auto-completion and documentation pop-ups work, there is no proper syntax highlighting (LSP-based) for the referenced classes and methods within the JARs.

Steps to Reproduce:

1. Open a Java project in VS Code.
2. Add JAR files directly to the java.project.referencedLibraries setting.
3. Use a class or method from the JAR in your code.

Expected Behavior:

LSP features should include syntax highlighting for classes and methods from the JARs, in addition to auto-completion and documentation pop-ups.

Actual Behavior:

While auto-completion and documentation pop-ups work, syntax highlighting does not apply for the JAR dependencies.

Screenshot:

• Referencing the JAR:
  
• Missing syntax highlighting:
  

Additional Context:

This issue occurs in a setup without Maven or Gradle. Are there additional configurations required to enable full syntax highlighting for JAR dependencies?

Reproduisez le problème dans VS Code avec un projet Java sans Maven ni Gradle et le paramètre java.project.referencedLibraries, puis suivez la manière dont les classes des JAR référencés sont traitées pour la coloration syntaxique. Le travail est considéré comme terminé lorsque les classes et les méthodes de ces JAR bénéficient de la coloration syntaxique et que la complétion ainsi que la documentation continuent de fonctionner.