Spring boot gradle multi module compilation error


Hello !
Take a multi module pure kotlin project, use gradle for build, all modules are spring boot modules.
Let’s say that module C depends on module B that depends on module A.

Well, module B won’t compile complaining about how compileKotlin can’t resolve classes from module A.

$ ./gradlew clean build
e: /Users/adah/workspaces/spring-gradle-kotlin-multimodule/item/src/main/kotlin/cz/zubal/spring/multimodule/b/RepositoryItemService.kt: (3, 36): Unresolved reference: customer
e: /Users/adah/workspaces/spring-gradle-kotlin-multimodule/item/src/main/kotlin/cz/zubal/spring/multimodule/b/RepositoryItemService.kt: (20, 60): Unresolved reference: Customer

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':item:compileKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

6 actionable tasks: 3 executed, 3 up-to-date

Hopefully enough, there’s a project doing just that on Github :

Locally, I have something very similar, and same issue : IntelliJ is doing fine (does not complain about compilation) but command line gradle just can’t completes.
I’ve also tried with gradle 4.8, spring boot 2.0.2, and kotlin 1.2.41


I’ve actually found a fix : do not apply the org.springframework.boot plugin on a library module and use

dependencyManagement {
    imports { mavenBom("org.springframework.boot:spring-boot-dependencies:${springBootVersion}") }

See my PR : https://github.com/mzubal/spring-gradle-kotlin-multimodule/pull/2/files