Extract duplicates of plugins from subProjects to root gradle config - spring-boot

Question

I have this project structure:
-root-project
-settings.gradle
-build.gradle
-subProjectA(spring-boot)
-build.gradle
-subprojectB(spring-boot)
-build.gradle
-subprojectC(spring-boot)
-build.gradle
-commonProject(java library)
-build.gradle
It is simple of my root settings.gradle:
rootProject.name = 'root-project'
include 'subProjectA'
include 'subprojectB'
include 'subprojectC'
include 'commonProject'
It is my root project build.gradle:
group = 'my.domain'
version = '0.0.1-SNAPSHOT'
ext {
springBootVersion = '2.1.3.RELEASE'
cxfVersion = '3.2.7'
uuidGeneratorVersion = '3.1.5'
commonLang3Version = '3.7'
encacheVersion = '2.6.11'
logstashVersion = '5.2'
}
And in each subProject, I have build.gradle file with these plugins:
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'idea'
apply plugin: 'java'
apply plugin: 'eclipse'
I have duplicate plugins and spring-boot dependency in each subModule and I want to move it to a common(root) file. But I don't understand how can I do it.

Answer 1

In the root build.gradle file you can apply common plugins or other configurations like common tasks, sourceCompatibility & targetCompatibility, manifest info, test configs, etc.. using the subprojects block as shown below.
subprojects {
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'idea'
apply plugin: 'java'
apply plugin: 'eclipse'
sourceCompatibility = 1.8
targetCompatibility = 1.8
jar {
manifest {
attributes (
'Built-By' : System.properties['user.name'],
'Build-Timestamp': new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").format(new Date()),
'Created-By' : "Gradle ${gradle.gradleVersion}",
'Build-Jdk' : "${System.properties['java.version']} (${System.properties['java.vendor']} ${System.properties['java.vm.version']})",
'Build-OS' : "${System.properties['os.name']} ${System.properties['os.arch']} ${System.properties['os.version']}"
)
}
}
// Other Configs
}