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kotlinlang

Just met a behaviour that I don’t understand. I have a multi-module project, let’s say: A, B, C. The dependency between them is: 
• A - doesn’t depend on other modules,
• B - depends on A
• C - depends on A and B
In A and B modules I use some lib, for ex: Koin. To add this lib, I should add the next lines to each module’s gradle file:
```repositories {
   jcenter()
   maven { url = uri("<https://dl.bintray.com/ekito/koin>") }
}```
and 
```dependencies {
      implementation("org.koin:koin-core:3.0.0-alpha-4")
}```
I’m ok with that, but the thing I don’t understand, why I have to add a repository block to C module as well, while I don’t have a dependency on that lib in C module? Thank you in advance.

You still have a dependency in C on that library, but it's not an implementation dependency but rather a runtime dependency. I.e. it isn't needed during C's compilation time, but is needed at C's run time.

Module C can't resolve the transitive dependency of A and B (koin-core in this case). Gradle makes sure that all dependencies (include transitive ones) are resolvable.