Use "parent" in Maven Project File

Mac Tutorials - Herong's Tutorial Examples

∟Use "parent" in Maven Project File

This section provides a tutorial on how to use 'profile' in Maven project file to provide options to control the build process.

If you want to organize a large Java development project into multiple modules, you can use the "parent" entry to link module-level pom.xml project files to the top-level project file. Here is how I created a two-module Java project:

1. Create the top-level directory and pom.xml file:

herong$ mkdir hello
herong$ vi hello/pom.xml

2. Define "packaging" as "pom" and a list of "modules" in the top-level pom.xml:

<?xml version="1.0" encoding="utf-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>herong</groupId>
  <artifactId>hello</artifactId>
  <version>1.0.1</version>
  <name>Hello</name>
  <description>Hello project</description>
  <packaging>pom</packaging>
  <properties>
    <source>1.8</source>
    <target>1.8</target>
  </properties>
  <modules>
    <module>module-a</module>
    <module>module-b</module>
  </modules>
</project>

3. Create module-level sub-directories and pom.xml files:

herong$ mkdir hello/module-a
herong$ vi hello/module-a/pom.xml

herong$ mkdir hello/module-b
herong$ vi hello/module-b/pom.xml

4. Reference the top-level project as "parent" in the module-a pom.xml file:

<?xml version="1.0" encoding="utf-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>herong</groupId>
    <artifactId>hello</artifactId>
    <version>1.0.1</version>
  </parent>
  <artifactId>hello-mod-b</artifactId>
  <name>Hello Module B</name>
  <description>Hello project - Module B</description>
  <properties>
    <maven.compiler.source>${source}</maven.compiler.source>
    <maven.compiler.target>${target}</maven.compiler.target>
  </properties>
</project>

5. Run "mvn" command on the top-level directory. Maven will automatically compile and build all sub-modules:

herong$ cd hello
herong$ /Library/Maven/apache-maven-3.6.2/bin/mvn --fail-at-end package
[INFO] ------------------------------------------------------------------
[INFO] Reactor Summary for Hello 1.0.1:
[INFO]
[INFO] Hello ........................................ SUCCESS [  0.005 s]
[INFO] Hello Module A ............................... SUCCESS [  0.810 s]
[INFO] Hello Module B ............................... SUCCESS [  0.525 s]
[INFO] ------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] Total time:  1.436 s