build.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<project name="packagegenerator" basedir="." default="jar">

    <property name="src.dir" value="src"/>
    <property name="classes.dir" value="classes"/>
	<property name="ant.home.dir" value="E:\\Softwares\\apache-ant-1.9.4"/>

    <target name="clean" description="Delete all generated files">
        <delete dir="${classes.dir}" failonerror="false"/>
        <delete file="${ant.project.name}.jar"/>
    </target>

    <target name="compile" description="Compiles the Task" depends="clean">
        <mkdir dir="${classes.dir}"/>
        <javac srcdir="${src.dir}" destdir="${classes.dir}"/>
    </target>

    <target name="jar" description="JARs the Task" depends="compile">
        <jar destfile="${ant.project.name}.jar" basedir="${classes.dir}"/>
        <copy file="${ant.project.name}.jar" todir="${ant.home.dir}\\lib"/>
    </target>
</project>