Ant Tutorial(2)-Using external libraries

/* src/oata/HelloWorld.java */
/* source code from */
package oata;
import org.apache.log4j.Logger;

public class HelloWorld {
  static  Logger logger = Logger.getLogger(HelloWorld.class);

  public static void main(String[] args) {

    System.out.println("Hello World");
    logger.info("Hello World"); //the old SysO-statement
  }
}

src/log4j.properties:

log4j.rootLogger=DEBUG, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%m%n

build.xml:

<project name="HelloWorld" basedir="." default="main">

  <property name="src.dir" value="src"/>
  <property name="build.dir" value="build"/>
  <property name="classes.dir" value="${build.dir}/classes"/>
  <property name="jar.dir" value="${build.dir}/jar"/>
    <property name="lib.dir" value="lib"/>

    <path id="classpath">
        <fileset dir="${lib.dir}" includes="**/*.jar"/>
    </path>

  <property name="main-class" value="oata.HelloWorld"/>

  <target name="clean">
    <delete dir="${build.dir}"/>
  </target>

  <target name="compile">
    <mkdir dir ="${classes.dir}"/>
    <javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>




  </target>

<target name="jar" depends="compile">
  <mkdir dir="${jar.dir}"/>
  <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
    <manifest>
      <attribute name="Main-Class" value="${main-class}"/>
    </manifest>
  </jar>
</target>

<target name="run" depends="jar">
  <java fork="true" classname="${main-class}">
    <classpath>
        <path refid="classpath"/>
        <path location="${jar.dir}/${ant.project.name}.jar"/>
    </classpath>
  </java>
</target>

<target name="clean-build" depends="clean,jar"/>

<target name="main" depends="clean,run"/>

</project>