build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="unique" basedir="." default="dist">

    <fileset id="libs" dir="lib" erroronmissingdir="false">
        <include name="*.jar"/>
    </fileset>

    <path id="classpath">
        <fileset refid="libs"/>
    </path>

    <target name="check-target-dir">
        <available file="target" property="target-present"/>
    </target>

    <target name="create-target-dir-if-needed"
            depends="check-target-dir"
            unless="target-dir-present">
        <mkdir dir="target"/>
    </target>

    <target name="clean" depends="create-target-dir-if-needed">
        <delete dir="target/classes" failonerror="false"/>
        <delete dir="target/dist" failonerror="false"/>
    </target>

    <target name="build" depends="clean">
        <mkdir dir="target/classes"/>
        <javac srcdir="src/java" includes="**/*.java"
               destdir="target/classes"
               source="1.7" target="1.7" debug="true">
            <classpath>
                <path refid="classpath"/>
            </classpath>
        </javac>
    </target>

	<target name="prepare-dist-dir" depends="clean">
		<mkdir dir="target/dist"/>
		<mkdir dir="target/dist/libs-exploded"/>
		<unjar dest="target/dist/libs-exploded">
			<patternset>
				<exclude name="META-INF/MANIFEST.MF"/>
			</patternset>
			<fileset refid="libs"/>
		</unjar>
	</target>

    <target name="dist" depends="build, prepare-dist-dir">
		<jar destfile="target/dist/${ant.project.name}.jar" manifest="src/manifest.txt">
			<fileset dir="target/classes" includes="**"/>
			<fileset dir="target/dist/libs-exploded" includes="**"/>
		</jar>
    </target>

</project>