Maven POM dependency management with submodules

I've got these two pom files:

1) Parent pom.xml

...

<modules>
    <module>web-module</module>
    <module>interface-module</module>
</modules>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>${project.groupId}.${project.artifactId}</groupId>
            <artifactId>interface-module</artifactId>
            <version>${project.version}</version>
            <type>ejb</type>
            <scope>provided</scope>
        </dependency>
    </dependencies>
 </dependencyManagement>

2) Child pom.xml

<dependencies>
    <dependency>
        <groupId>${project.parent.groupId}.${project.parent.artifactId}</groupId>
        <artifactId>interface-module</artifactId>
        <version>${project.version}</version>
        <type>ejb</type>
    </dependency>
</dependencies>

The question is:

Why it can't resolve the dependency being managed by parent dependencyManagment with version omitted in the Child? Why do I have to specify the version while using dependencyManagment for submodule that is inherited from the Parent that is aggregating these modules? Maybe some advice?

UPD: Turned out that this behavior exists when groupId of the Child is changed and is not the one that is inherited from the Parent... Basically I have 2 submodules of the Parent one and they both are children of the Parent one. When I change the groupId in the Child module then it asks me to specify the version during dependency management which is kinda strange. Any ideas why maven is acting like that?

---

Parent's are not passed on to submodules, meaning you'll have to declare the Parent also in the submodule.

Also, note that you are doing two things in one module:

Aggregation of submodules and

Acting as a parent for modules that specify this one as parent

This is usually ok, but at some point you might run into circular dependencies or similar problems if your setup gets a little more complex. As long as you know the problem, you should be fine.

Here are some more details

链接地址: http://www.djcxy.com/p/29704.html

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