LSP4J does not compile in Eclipse IDE (com.google.gson cannot be resolved to a module)

[travkin79]

Hello everyone,
I hope, someone can give me a hint what I am doing wrong.

I cloned LSP4J (main branch, version 0.24.0-SNAPSHOT), imported and built the Eclipse projects as described in the contribution guide. Buildship / gradle successfully built the projects / modules. But the Eclipse IDE / JDT is producing many compile / Java errors, e.g. complaining that "com.google.gson cannot be resolved to a module".

Checking the project and external dependencies in the Package Explorer shows the wired gson-2.11.0.jar, so GSON should be available. Maybe JDT does not consider it being a Java module? Does anyone have a clue what I should do to get it working in Eclipse IDE?

Could that be related to issue #702 or to eclipse-jdt/eclipse.jdt.core#2495?

Besides, now and then (sporadically) I get the following strange exception that disappears if I repeatedly run the launch config to build the projects.

...
> Task :org.eclipse.lsp4j.debug:generateXtext FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':org.eclipse.lsp4j.debug:generateXtext'.
> java.util.zip.ZipException: ZipFile invalid LOC header (bad signature)

I'm using

• Eclipse 4.30
• Buildship 3.1.10
• Xtend IDE 2.33.0
• OpenJDK 11.0.18
• RHEL 9.2

[cdietrich]

maybe a side effect of the module-java addition.
no idea why this was not properly tested?

[cdietrich]

#843