Gradle not including dependencies from implemented projects when unit testing parent project?

Help/Discuss
1

I have a simple gradle multi-project setup with 3 sub-projects.

The project outline

  • Project Root (Solution)
    • Project A
    • Project B
    • Common

All the sub projects are java-library’s.

  • Project A depends on Common and Project B
  • Project B also depends on Common

Project A and B use org.apache.logging.log4j for logging and this works fine during unit testing in Project B. But when I try to unit test Project A the unit test fails, the moment some class in Project B tries to log something.

The error I’m getting:
image

Also, I’m not sure if this is normal, but I can use test classes of Project B in Project A and I can use dependencies implemented (not using api configuration) of Project B in Project A.

I’ve tried some different dependency configurations such as ‘api’, ‘runtimeOnly’, ‘compileOnly’, … I also tried googling the issue but I find it hard to describe the issue i’m having and had no luck googling.

Environment

Gradle 6.3
JDK 11.0.9
OS Windows 10
IDE Eclipse 2020-09 (4.17.0)

Gradle setup

The build.gradle file in the root directory (solution directory)

subprojects {

    apply plugin: 'java-library'

    repositories { jcenter() }

    java.sourceCompatibility = JavaVersion.VERSION_11

}

The settings.gradle file in the root directory (solution directory)

rootProject.name = 'SomeSolution'
include "Common", "NetKit", "BetterBus"

The build.gradle file in the project directory of Common

dependencies { 
    testImplementation 'junit:junit:4.12' 
}

The build.gradle file in the project directory of Project B

dependencies {
    implementation project(":Common")

    implementation 'org.apache.logging.log4j:log4j-api:2.13.3'

    implementation 'org.apache.commons:commons-lang3:3.11'
    implementation 'com.google.guava:guava:29.0-jre'

    implementation 'org.apache.logging.log4j:log4j-slf4j18-impl:2.13.3'
    implementation 'org.apache.logging.log4j:log4j-core:2.13.3'

    implementation 'net.jodah:typetools:0.6.2'
    implementation 'org.objectweb.asm:com.springsource.org.objectweb.asm:3.2.0'

    testImplementation 'junit:junit:4.12'
}

The build.gradle file in the project directory of Project A

dependencies {
    implementation project(":Common")
    implementation project(":ProjectB")

    implementation 'org.apache.logging.log4j:log4j-api:2.13.3'

    implementation 'org.apache.logging.log4j:log4j-slf4j18-impl:2.13.3'
    implementation 'org.apache.logging.log4j:log4j-core:2.13.3'

    api 'io.netty:netty-all:4.1.54.Final'
    implementation 'it.unimi.dsi:fastutil:8.4.4'

    testImplementation 'junit:junit:4.12'
}

I also posted this question on StackOverflow but I don’t seem to get any replies / answers.