build.xml

<project default="jar">
    <property name="build" location="build"/>
    <property name="classesdir" location="${build}/classes"/>
    <property name="jardir" location="${build}/jar"/>
    <property name="libdir" location="libs"/>
    <property name="destjar" location="${jardir}/ScriptJava.jar"/>

	<target name="clean">
        <delete dir="${build}"/>
        <delete dir="${libdir}"/>
    </target>  
    <target name="compile">
        <mkdir dir="${classesdir}"/>
        <javac srcdir="src" destdir="${classesdir}"/>
    </target>
     <target name="jar" depends="compile" >
        <mkdir dir="${jardir}"/>
        <jar destfile="${destjar}" basedir="${classesdir}">
            <manifest>
                <attribute name="Main-Class" value="scriptjava.Main"/>
            </manifest>
        </jar>
    </target>
    <target name="install" depends="jar">
        <mkdir dir="${libdir}"/>
        <copy file="${destjar}" todir="${libdir}"/>
    </target>
</project>