ant example of building executable jar

build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="make_exec_jar" default="jar" basedir="." >
    <target name="jar">
        <jar basedir="../classes" jarfile="hello.jar">
            <manifest>
                <attribute name="Main-Class" value="me.takus.sample.Hello"/>
            </manifest>
        </jar>
    </target>
</project>