OneJar Ant Build XML

build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="YourProjectName" default="jar" basedir=".">
	<target name="init">
		<property name="version" value="1.0.0" />
		<property name="debuglevel"	value="source,lines,vars"/>
		<property name="main-class"	value="com.company.project.mainclass"/>
		<property name="src.dir"	value="src"/>
	  <property name="build.dir"	value="build"/>
    <property name="classes.dir"	value="${build.dir}/classes"/>
		<property name="lib.dir"	value="lib" />
		
		<!-- put all dependencies libraries in ./lib folder -->
		<path id="Build Dependencies Classpath">
      <fileset dir="${lib.dir}">
				<include name="**/*.jar"/>
		  </fileset>
		</path>
		
		<!-- needed for dev run -->
		<path id="Run application"  location="./${lib.dir}" />
		
		<tstamp>
			<format property="timestamp" pattern="yyyy-MM-dd HH:mm:ss" />
		</tstamp>
	</target>
	
	<!-- clean build dir -->
	<target name="clean" depends="init">
		<delete dir="${build.dir}"/>
	</target>
	
	<!-- compile codes and put in classes dir (build/classes) and use classpath -->
	<target name="compile" depends="clean">
		<mkdir dir="${classes.dir}"/>
		<javac	srcdir="${src.dir}" 
				destdir="${classes.dir}" 
				includeAntRuntime="false" 
				debug="true" debuglevel="${debuglevel}">
			<classpath refid="Build Dependencies Classpath"/>			
		</javac>
	</target>

  <!-- build main jar file -->
	<target name ="jar" depends="compile">
	  <!--copy properties file -->
		<copy includeemptydirs="false" todir="${build.dir}/classes">    
			<fileset dir="${src.dir}">
				<exclude name="**/*.java"/>
			</fileset>
		</copy>

    <!--Build main jar-->
		<jar destfile="${ant.project.name}.jar" basedir="${classes.dir}">
    		<manifest>
    			<attribute name="Main-Class" 	value="${main-class}"/>
    			<attribute name="Build-Version"	value="${version}"/>
    			<attribute name="Build-Date" 	value="${timestamp}"/>
    		</manifest>
    	</jar>
  	</target>
	
	<!--only aimed to run in dev env -->
	<target name="run" depends="jar">
		<java jar="${ant.project.name}.jar" fork="true">
			<classpath>
				<path refid="Build Dependencies Classpath" />
				<path refid="Run application" />
			</classpath>
		</java>
	</target>
	
	<!-- build one jar file -->
	<taskdef name="one-jar" classname="com.simontuffs.onejar.ant.OneJarTask" onerror="report" />
	<target name="onejar" depends="jar">
		<!-- Construct the One-JAR file -->
		<one-jar destfile="${ant.project.name}Exec.jar">
			<manifest>
				<attribute name="One-Jar-Main-Class" value="${main-class}"/>
				<attribute name="Build-Version"	value="${version}"/>
				<attribute name="Build-Date" 	value="${timestamp}"/>
			</manifest>
			<main jar="${ant.project.name}.jar" />
			<lib>
				<fileset dir="${lib.dir}" />
			</lib>
		</one-jar>
	</target>
	
	<!-- run one jar file -->
	<target name="run onejar" depends="onejar">
		<java jar="${ant.project.name}Exec.jar" fork="true" />
	</target>
</project>