Gradle sub projects won't compile with dependencies on sub-projects - spring-boot

Question

I have following project structure with gradle 6.8.3 version and spring-boot 2.4.3
Project-A
|
|___ Project B
|
|___ Project C
Project A being root project and project B is being dependent on project C.
Project C build.gradle
plugins {
id 'org.springframework.boot' version '2.4.3'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
id 'maven'
}
group = 'com.test'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
mavenLocal()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter'
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
implementation 'org.springframework.boot:spring-boot-starter-logging'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
test {
useJUnitPlatform()
}
Project B build.gradle file
plugins {
id 'org.springframework.boot' version '2.4.3'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
id 'maven'
}
group = 'com.test'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
mavenLocal()
}
dependencies {
implementation project(':PROJECT-C')
implementation 'org.springframework.boot:spring-boot-starter'
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
implementation 'org.springframework.boot:spring-boot-starter-logging'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
implementation 'project-c:0.0.0-SNAPSHOT'
}
test {
useJUnitPlatform()
}
When trying to build project-c it throws
Following are the details for more information.
JDK11
IntelliJ Idea
Error thrown
What went wrong:
A problem occurred evaluating root project 'project-c'.
Project with path ':project-b' could not be found in root project 'project-c'.
Any help is highly appreciated.
settings.gradle file at root level
rootProject.name = 'Project-A'
include 'Project-B', 'Project-C'
Also I have a settings.gradle file in all sub modules also. Content of settings.gradle in sub modules contains only name of the project

Answer 1

Assuming that your setup in the settings.gradle file is correct:
In your dependencies block in project B build.gradle file, instead of
implementation project(':PROJECT-C')
try
implementation project(':Project-A:Project-C')
as project a is the root project.

Answer 2

In my case I had a rouge settings.gradle inside one of the child project dir 🤦‍♂️ and it managed to waste couple of my hours. 😔