Example project showcasing the Gradle SuperPOM concept

build.gradle

plugins {
    id 'java'
    id 'com.acme.gradle.superpom' version '1.0.0'
}

group   = 'com.acme.gradle'
version = '1.0.0-SNAPSHOT'

config {
    info {
        name          = 'myproject'
        description   = 'My Project'
        inceptionYear = '2018'

        people {
            person {
                id    = 'aalmiray'
                name  = 'Andres Almiray'
                roles = ['developer']
            }
        }

        links {
            scm = 'http://com.acme/git/myproject.git'
        }
    }
}

effective-pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.acme.gradle</groupId>
  <artifactId>myproject</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <repositories>
    <repository>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
    </pluginRepository>
  </pluginRepositories>
  <build>
    <sourceDirectory>/tmp/myproject/src/main/java</sourceDirectory>
    <scriptSourceDirectory>/tmp/myproject/src/main/scripts</scriptSourceDirectory>
    <testSourceDirectory>/tmp/myproject/src/test/java</testSourceDirectory>
    <outputDirectory>/tmp/myproject/target/classes</outputDirectory>
    <testOutputDirectory>/tmp/myproject/target/test-classes</testOutputDirectory>
    <resources>
      <resource>
        <directory>/tmp/myproject/src/main/resources</directory>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>/tmp/myproject/src/test/resources</directory>
      </testResource>
    </testResources>
    <directory>/tmp/myproject/target</directory>
    <finalName>myproject-1.0.0-SNAPSHOT</finalName>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.3</version>
        </plugin>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <version>2.2-beta-5</version>
        </plugin>
        <plugin>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.8</version>
        </plugin>
        <plugin>
          <artifactId>maven-release-plugin</artifactId>
          <version>2.5.3</version>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>
      <plugin>
        <artifactId>maven-clean-plugin</artifactId>
        <version>2.5</version>
        <executions>
          <execution>
            <id>default-clean</id>
            <phase>clean</phase>
            <goals>
              <goal>clean</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.6</version>
        <executions>
          <execution>
            <id>default-testResources</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>testResources</goal>
            </goals>
          </execution>
          <execution>
            <id>default-resources</id>
            <phase>process-resources</phase>
            <goals>
              <goal>resources</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-jar</id>
            <phase>package</phase>
            <goals>
              <goal>jar</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <executions>
          <execution>
            <id>default-compile</id>
            <phase>compile</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
          <execution>
            <id>default-testCompile</id>
            <phase>test-compile</phase>
            <goals>
              <goal>testCompile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.12.4</version>
        <executions>
          <execution>
            <id>default-test</id>
            <phase>test</phase>
            <goals>
              <goal>test</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-install</id>
            <phase>install</phase>
            <goals>
              <goal>install</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>2.7</version>
        <executions>
          <execution>
            <id>default-deploy</id>
            <phase>deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.3</version>
        <executions>
          <execution>
            <id>default-site</id>
            <phase>site</phase>
            <goals>
              <goal>site</goal>
            </goals>
            <configuration>
              <outputDirectory>/tmp/myproject/target/site</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
          <execution>
            <id>default-deploy</id>
            <phase>site-deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
            <configuration>
              <outputDirectory>/tmp/myproject/target/site</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <outputDirectory>/tmp/myproject/target/site</outputDirectory>
          <reportPlugins>
            <reportPlugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-project-info-reports-plugin</artifactId>
            </reportPlugin>
          </reportPlugins>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <reporting>
    <outputDirectory>/tmp/myproject/target/site</outputDirectory>
  </reporting>
</project>

effective-settings

$ gradle effectiveSettings --sections=info,bintray

> Task :effectiveSettings
info:
    name: myproject
    description: My Project
    url: http://acme.com
    inceptionYear: 2018
    copyrightYear: 2018
    vendor: Acme
    authors:
        Keyser Soze
    organization:
    people:
        admin:
            id: admin
            name: Keyser Soze
            roles:
                admin
        aalmiray:
            id: aalmiray
            name: Andres Almiray
            roles:
                developer
    links:
        website: http://acme.com
        issueTracker: http://acme.com/issues
        scm: http://com.acme/git/myproject.git
    specification:
        enabled: false
        title: myproject
        version: 1.0.0-SNAPSHOT
        vendor: Acme
    implementation:
        enabled: true
        title: myproject
        version: 1.0.0-SNAPSHOT
        vendor: Acme
bintray:
    enabled: false

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns='http://maven.apache.org/POM/4.0.0' 
         xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd' 
         xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.acme.gradle</groupId>
  <artifactId>myproject</artifactId>
  <version>1.0.0-SNAPSHOT</version>
</project>

settings.gradle

pluginManagement {
    repositories {
        jcenter()
        maven { url 'https://plugins.gradle.org/m2/' }
        mavenLocal()
    }
}

superpom-build.gradle

buildscript {
    repositories {
        jcenter()
        maven { url 'https://plugins.gradle.org/m2/' }
    }

    dependencies {
        classpath 'org.kordamp.gradle:project-gradle-plugin:0.8.0'
    }
}

apply plugin: 'groovy'
apply plugin: 'java-gradle-plugin'
apply plugin: 'org.kordamp.gradle.project'

group   = 'com.acme.gradle'
version = '1.0.0'

config {
    release = (rootProject.findProperty('release') ?: false).toBoolean()

    info {
        name          = 'superpom-plugin'
        vendor        = 'Acme'
        description   = 'Company wide super POM'
        inceptionYear = '2018'

        links {
            website   = 'http://acme.com'
        }

        specification  { enabled = false }
        implementation { enabled = false }

        people {
            person {
                id    = 'aalmiray'
                name  = 'Andres Almiray'
                roles = ['developer']
            }
        }
    }

    groovydoc {
        replaceJavadoc = true
        options {
            link 'https://docs.gradle.org/4.0/javadoc/', 'org.gradle.'
        }
    }

    license {
        licenses {
            license {
                id = 'Apache-2.0'
            }
        }
    }

    bintray { enabled = false }
}

repositories {
    jcenter()
    maven { url 'https://plugins.gradle.org/m2/' }
}

dependencies {
    compile gradleApi()

    compile 'org.kordamp.gradle:project-gradle-plugin:0.8.0'
}

gradlePlugin {
    plugins {
        superpomPlugin {
            id                  = 'com.acme.gradle.superpom'
            implementationClass = 'com.acme.gradle.SuperpomPlugin'
        }
    }
}

SuperpomPlugin.groovy

package com.acme.gradle

import org.gradle.api.Plugin
import org.gradle.api.Project
import org.kordamp.gradle.plugin.project.ProjectPlugin
import org.kordamp.gradle.plugin.base.ProjectConfigurationExtension

class SuperpomPlugin implements Plugin<Project> {
    void apply(Project project) {
        project.plugins.apply(ProjectPlugin)

        project.extensions.findByType(ProjectConfigurationExtension).with {
            release = (project.rootProject.findProperty('release') ?: false).toBoolean()

            info {
                vendor           = 'Acme'
                links {
                    website      = 'http://acme.com'
                    issueTracker = 'http://acme.com/issues'
                }

                specification { enabled = false }

                people {
                    person {
                        id    = 'admin'
                        name  = 'Keyser Soze'
                        roles = ['admin']
                    }
                }
            }

            license {
                licenses {
                    license {
                        id = 'Apache-2.0'
                    }
                }
            }

            bintray {
                enabled = false
            }
        }

        project.allprojects {
            repositories {
                mavenCentral()
                mavenLocal()
            }
        }
    }
}