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I have a bunch of gradle sub modules in a server side project to separate the different layers (data/domain/api), when I use ctrl-click on a function or class Intellij isn't able to show me occurances in other modules, I have to use global text search to try to find them... is this a known problem? Or maybe only in my setup and it could be solved somehow?

What do you mean by "sub modules"? `include` (a project) or `includeBuild` (a build)?

IDEA should definitely be able to navigate usages from one Gradle project or build to another, so it's probably your setup.

Ok, so at least I know that my setup is the problem, thanks! I'll try to look into it a bit better.

Are all projects highlighted in bold in the project view, and visible in the Gradle view?

Yes, but only what they relate to, it's hexagonal architecture

Is there any warning/ message during Gradle sync? (in the 'build' view)