How can I create maven module from 2 different parents?

Question

I'm adding new maven module to project. It will use spring-boot. Old modules are not using it. So, my new module must be child of parent project but at the same time must be a child of spring-boot-starter-parent. How can I make my project child of 2 different parent?

My current parent

<parent>
    <groupId>com.somegroup</groupId>
    <artifactId>Parent</artifactId>
    <version>1.0</version>
</parent>

Spring-boot parent

<parent>
    <!-- Your own application should inherit from spring-boot-starter-parent -->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.1.RELEASE</version>
</parent>

Answer 1

Since Maven project can have only one parent you can use a different approach. Instead of inheritance, you can import spring-boot-dependencies in the dependency management section and keep the original parent.

<parent>
    <groupId>com.somegroup</groupId>
    <artifactId>Parent</artifactId>
    <version>1.0</version>
</parent>

<dependencyManagement>
    <dependencies>
        <dependency>
            <!-- Import dependency management from Spring Boot -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>1.5.1.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

You can read about the constraints in the official documentation, which are basically about the way you change the version of dependencies provided by Spring Boot.