Maven variable for reactor root

Question

In a multi-module maven project, is there a variable that points to the root project folder?

• ${project.basedir} points to the current project\'s d

Answer 1

For me, there was a need for root directory during variable interpolation, not for plugins section - for local directory relative to root with hand-crafted jars. I know this is a bad practice to have local directory with jars, but this was a requirement of project.

Why I was unable to use different solutions:

• ${session.executionRootDirectory} and ${user.dir} are tied with directory from which maven command was executed. I want to refer to the same directory independently of directory, from which maven was launched.
• ${project.basedir} ,as mentioned above, points to current project directory, so child modules will search for jars in wrong location.
• I had about 100 projects, so defining relative paths or usage of accepted answer for this question is quite complex in my case.
• Directory plugin can be used only for plugin configurations, not for variable interpolation

So, in my case with bad requirements I have used environment variable which refers project root and used it in pom.xml. Use it as last resort, when other solutions do not work. Here is example, how I use environment variable in my case:

<repositories>
    <repository>
        <id>local-maven-repo</id>
        <!--NOTE: export PROJECT_ROOT=<location>-->
        <url>file:///${env.PROJECT_ROOT}/local-repo</url>
    </repository>
</repositories>