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maven 2 - Maven2 property that indicates the parent directory

I have a multi-modules project, like this one:

main-project/
    module1/
    module2/
        sub-module1/
        sub-module2/
        sub-module3/
        ...
    module3/
    module4/
    ...

I need to define a set of properties (that are dependent of the environment on which I want to release my project) in Maven2. I will not use <properties> as there is lots of properties... Thus, I use the Properties Maven2 plugin.

The properties files are located in the main-project/ directory. How can I set the correct directory in the main pom.xml, in order to specify to any children where to find the properties file?

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>properties-maven-plugin</artifactId>
    <version>1.0-alpha-1</version>
    <executions>
        <execution>
            <phase>initialize</phase>
            <goals>
                <goal>read-project-properties</goal>
            </goals>
            <configuration>
                <files>
                    <file>???/env_${env}.properties</file>
                </files>
            </configuration>
        </execution>
    </executions>
</plugin>

If I set only <file>env_${env}.properties</file>, then when Maven2 compiles the first module, it will not find the main-project/env_dev.properties file. If I set <file>../env_${env}.properties</file>, then an error will be raised at the parent level, or at any sub-module level...

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by (71.8m points)

Try setting a property in each pom to find the main project directory.

In the parent:

<properties>
    <main.basedir>${project.basedir}</main.basedir>
</properties>

In the children:

<properties>
    <main.basedir>${project.parent.basedir}</main.basedir>
</properties>

In the grandchildren:

<properties>
    <main.basedir>${project.parent.parent.basedir}</main.basedir>
</properties>

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