Unable to locate the jar in Maven Dependency Management

Question

I have 2 projects testing.parent and testing.child. The project structure is as below:

Their individual poms are as below:

testing.parent

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>testing.group</groupId>
    <artifactId>testing.parent</artifactId>
    <version>1.0</version>
    <packaging>pom</packaging>
    <name>testing.parent</name>
    <url>http://maven.apache.org</url>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>    

testing.child

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>testing.group</groupId>
    <artifactId>testing.child</artifactId>
    <version>1.1</version>
    <packaging>jar</packaging>
    <name>testing.child</name>
    <url>http://maven.apache.org</url>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>testing.group</groupId>
                <artifactId>testing.parent</artifactId>
                <version>1.0</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

In order to test the dependency management I tried to import the log4j jar to child project but still the jar is not available in the child project. Is this the correct way to import the jars?

Answer 1

Is this the correct way to import the jars?

Yes, include the log4j in the dependency section of the child pom.xml.

<dependencies>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version> <!-- version is optional when using dependency management -->
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>

---

Also, make sure to refer the parent from the child as well, include the following in child pom.xml for that:

<parent>
    <artifactId>testing.parent</artifactId>
    <groupId>testing.group</groupId>
    <version>1.0</version>
</parent>

ensuring the similar reference in the parent pom.xml as

<modules>
    <module>testing.child</module>
</modules>

Answer 2

If you add below part to child pom.xml file, you don't need to import lof4j dependency separately though child pom.xml.

<parent>
    <artifactId>testing.parent</artifactId>
    <groupId>testing.group</groupId>
    <version>1.0</version>
</parent>