如何将git子模块与maven子模块一起使用？

mkdir parent-project
cd parent-project
git init

<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.example</groupId>
    <artifactId>parent-project</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <modules>
        <module>module1</module>
        <module>module2</module>
    </modules>
</project>

mkdir module1
cd module1
git init
git submodule add https://github.com/user/repo1.git
cd ..

mkdir module2
cd module2
git init
git submodule add https://github.com/user/repo2.git
cd ..

<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">
    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>module1</artifactId>
</project>

cd parent-project
git add .
git commit -m "Initial commit with submodules and Maven setup"

git submodule update --remote
git add .
git commit -m "Update submodule to latest version"

mvn clean install

package com.example.module1;

import com.example.module2.SubModuleClass;

public class Main {
    public static void main(String[] args) {
        SubModuleClass obj = new SubModuleClass();
        System.out.println(obj.getMessage());
    }
}

package com.example.module2;

public class SubModuleClass {
    public String getMessage() {
        return "Hello from Module2!";
    }
}