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The common problem with Maven multi module project is: how to get known of the Project root path.
This is needed for access to root-related files (for example in maven-antrun-plugin or java code). The simplest solution is set environment variable or system properiy (via run option -DROOT_HOME=..). To avoid environment variable I've found one rather complicated solution. Spend almost for a day I've found other way to solve problem: just put this plugin to your root pom.xml of multi module maven project.


        <build>
            <plugins>
                <plugin>
                    <groupId>org.codehaus.groovy.maven</groupId>
                    <artifactId>gmaven-plugin</artifactId>
                    <version>1.0</version>
                    <executions>
                        <execution>
                            <id>set PROJECT_BASE_HOME</id>
                            <phase>generate-resources</phase>
                            <goals>
                                <goal>execute</goal>
                            </goals>
                            <configuration>
                                <source>
                                    base = project
                                    dir = project.basedir.getCanonicalPath()
                                    while(base.model.parent){
                                       dir=dir + "/" + base.model.parent.relativePath.substring(0, base.model.parent.relativePath.length()-8)
                                       base=base.parent
                                    }
                                    project.properties.ROOT_HOME=dir
                                    println "ROOT_HOME=:$project.properties.PROJECT_BASE_HOME"
                                </source>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>