src/it/multirelease-patterns/multiproject/multirelease-base/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
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<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>

  <parent>
    <groupId>multirelease</groupId>
    <artifactId>multirelease-parent</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>
  <artifactId>multirelease</artifactId>

  <name>Base</name>

  <build>
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
      </resource>
      <resource>
        <directory>target/generated-resources</directory>
        <filtering>false</filtering>
      </resource>
    </resources>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <configuration>
            <source>1.8</source>
            <target>1.8</target>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <profiles>
    <profile>
      <id>nine</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <build>
        <pluginManagement>
          <plugins>
            <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-jar-plugin</artifactId>
              <configuration>
                <archive>
                  <manifestEntries>
                    <Multi-Release>true</Multi-Release>
                  </manifestEntries>
                </archive>
              </configuration>
            </plugin>
          </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-dependency-plugin</artifactId>
              <version>3.1.0</version>
              <executions>
                <execution>
                  <id>add-java9-supplement</id>
                  <phase>generate-resources</phase>
                  <goals>
                    <goal>unpack-dependencies</goal>
                  </goals>
                  <configuration>
                    <includeGroupIds>multirelease</includeGroupIds>
                    <includeArtifactIds>multirelease-nine</includeArtifactIds>
                    <excludeTransitive>true</excludeTransitive>
                    <includes>**/*.class</includes>
                    <outputDirectory>${project.build.directory}/generated-resources/META-INF/versions/9</outputDirectory>
                  </configuration>
                </execution>
              </executions>
            </plugin>
        </plugins>
      </build>
      <dependencies>
        <dependency>
          <groupId>multirelease</groupId>
          <artifactId>multirelease-nine</artifactId>
          <version>1.0.0-SNAPSHOT</version>
          <scope>provided</scope>
          <exclusions>
            <exclusion>
              <groupId>${project.groupId}</groupId>
              <artifactId>${project.artifactId}</artifactId>
            </exclusion>
          </exclusions>
        </dependency>
      </dependencies>
    </profile>
  </profiles>
</project>