Maven 获取依赖的相对路径

Question

I'm trying to get the relative path of the Maven dependency inside a pom.xml . Here is my project structure:

|-Project
  |--firstproject
     |---src
     |...
     |pom.xml
  |--secondproject
     |---src
     |...
     |pom.xml

Here is the pom.xml of firstproject where I'm importing secondproject as dependency.

...
<dependency>
    <groupId>com.foo</groupId>
    <artifactId>secondproject</artifactId>
    <version>1.0.0</version>
</dependency>
...

I would like to have the system path of Maven dependency like this:

<properties>
    <my.lib.path>${maven.dependency.com.foo.secondproject}</my.lib.path>
</properties>

Is that possible? Is there maybe another way to do this?

I know I can use maven-antrun-plugin , but I don't want the final jar . I want the relative path of the dependency like: /home/user/projects/Project/secondproject . Is there any way?

Answer 1

This is a bad idea and is poor practice when it comes to Maven dependencies.

First and foremost, your projects will always need to be relatively locateable to one another, which means that your build environment will have to have them together. This translates to builds which may not be repeatable because there is absolutely no guarantee that the second project would not have changed between builds of the first project.

Second, the conventional way to combine multiple related projects is to have subprojects instead. This way you can have your first project depend on your second project without any headaches.

Failing any of that, then the best alternative is to publish the second project to your local m2 repository or your repository store, and pulling it down in your first project.