build.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE project>

<project name="all" default="dist">
    <fileset id="subdirs" dir="." includes="*/build.xml"/>
    <target name="init">
        <echo message="----- init in ${ant.project.name} -----"/>
        <subant target="init">
            <fileset refid="subdirs"/>
        </subant>
    </target>

    <target name="compile">
        <echo message="----- compile in ${ant.project.name} -----"/>
        <subant target="compile">
            <fileset refid="subdirs"/>
        </subant>
    </target>

    <target name="test">
        <echo message="----- test in ${ant.project.name} -----"/>
        <subant target="test">
            <fileset refid="subdirs"/>
        </subant>
    </target>

    <target name="dist">
        <echo message="----- dist in ${ant.project.name} -----"/>
        <subant target="dist">
            <fileset refid="subdirs"/>
        </subant>
    </target>

    <target name="javadoc">
        <echo message="----- javadoc in ${ant.project.name} -----"/>
        <subant target="javadoc">
            <fileset refid="subdirs"/>
        </subant>
    </target>

    <target name="clean">
        <echo message="----- clean in ${ant.project.name} -----"/>
        <subant target="clean">
            <fileset refid="subdirs"/>
        </subant>
    </target>
</project>