The title pretty much says it all. When modules are enabled, imgui.static.ForwardDeclarationsKt can not be loaded and an NoClassDefFoundError exception is thrown.

Relevant stack trace:

java.lang.NoClassDefFoundError: imgui/static/ForwardDeclarationsKt
	at com.github.kotlin_graphics.imgui.core/imgui.classes.IO.<init>(IO.kt:136)
	at com.github.kotlin_graphics.imgui.core/imgui.classes.Context.<init>(Context.kt:34)
	at com.github.kotlin_graphics.imgui.core/imgui.classes.Context.<init>(Context.kt:27)
	at com.github.kotlin_graphics.imgui.core/imgui.classes.Context.<init>(Context.kt)

I am using java OpenJDK 17.0.1 and maven.

To produce the error all that is needed is

public static void main(String[] args){
	new Context();
}

and modules file

module your.module {
	requires com.github.kotlin_graphics.imgui.core;
}

I'm no modules expert but it looks like the imgui.static is not being exported in the core and that might be causing the issue.