如何解决这个 maven 多模块依赖问题？ 安装后不是从本地m2导入

Question

I have a project with two modules in that. The parent POM looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<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>org.example</groupId>
    <artifactId>bc</artifactId>
    <packaging>pom</packaging>
    <version>1.3-SNAPSHOT</version>

    <modules>
        <module>njoy</module>
        <module>api</module>
    </modules>

</project>

The njoy module POM looks like this:

<?xml version="1.0" encoding="UTF-8"?> <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>
        <artifactId>bc</artifactId>
        <groupId>org.example</groupId>
        <version>1.3-SNAPSHOT</version>
    </parent>


    <modelVersion>4.0.0</modelVersion>

    <artifactId>njoy</artifactId>
    <packaging>jar</packaging>

</project>

The api module POM looks like this:

<?xml version="1.0" encoding="UTF-8"?> <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>
        <artifactId>bc</artifactId>
        <groupId>org.example</groupId>
        <version>1.3-SNAPSHOT</version>
    </parent>


    <modelVersion>4.0.0</modelVersion>

    <artifactId>api</artifactId>
    <packaging>jar</packaging>

</project>

I have done mvn clean install for the parent POM so that it gets into my local m2 repository. Now i want to use this project as a dependency in another project(say experiments) by providing it as dependency. These are the folders created in my m2 repo.

This is my other project where i am using it as a dependency, and the POM for it looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<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>org.example</groupId>
    <artifactId>experiments</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>bc</artifactId>
            <version>1.3-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.example</groupId>
            <artifactId>klk</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

But it cannot find the multi-module project artifact, where there is another dependency which is a single module project( klk ) and there is no issue.

Please help. What am i missing here?

Thanks in advance!!

Answer 1

The artifact bc is just a pom with some modules. It cannot be used as a dependency. You probably thought you can reference "all artifacts" by referencing the parent POM. This is not possible.

The artifacts njoy and api are jars -- they can be used as a dependency of another project.