build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="wptools" default="help" basedir=".">
  <!-- import all environment variables as env.* -->
  <property environment="env"/>

  <!-- ensure required environment variables are set -->
  <macrodef name="env-require">
    <attribute name="name"/>
    <sequential>
      <fail message="Environment variable @{name} not set!">
        <condition>
          <not><isset property="env.@{name}"/></not>
        </condition>
      </fail>
    </sequential>
  </macrodef>
  <env-require name="JRE_HOME"/>

  <!-- cribbed from https://stackoverflow.com/questions/7129672/uppercase-lowercase-capitalize-an-ant-property -->
  <scriptdef language="javascript" name="toLowerCase">
    <attribute name="value" />
    <attribute name="target" />
    <![CDATA[
      project.setProperty( attributes.get( "target" ),
                           attributes.get( "value" ).toLowerCase() );
    ]]>
  </scriptdef>

  <!-- Define the properties used by the build -->
  <property name="app.name"      value="${ant.project.name}"/>
  <toLowerCase target="lc.app.name" value="${app.name}"/>
  <property name="jar.name"      value="${basedir}/${lc.app.name}.jar"/>
  <property name="work.home"     value="${basedir}/work"/>
  <property name="lib.home"      value="${basedir}/lib"/>
  <property name="src.home"      value="${basedir}/src"/>

  <!-- help message -->
  <target name="help">
    <echo>You can use the following targets:</echo>
    <echo> </echo>
    <echo>  help    : (default) Prints this message </echo>
    <echo>  all     : Cleans, compiles, and stages application</echo>
    <echo>  clean   : Deletes work directories</echo>
    <echo>  compile : Compiles servlets into class files</echo>
    <echo>  jar     : Make JAR file.</echo>
    <echo> </echo>
    <echo>For example, to clean, compile, and package all at once, run:</echo>
    <echo>prompt> ant all </echo>
  </target>

  <!-- Define the CLASSPATH -->
  <target name="classpath">
    <path id="std.classpath">
      <fileset dir="${env.JRE_HOME}/lib">
        <include name="tools.jar"/>
      </fileset>
      <fileset dir="${lib.home}">
        <include name="*.jar"/>
      </fileset>
    </path>
    <path id="compile.classpath">
      <path refid="std.classpath"/>
      <pathelement location="${src.home}"/>
    </path>
    <path id="test.classpath">
      <path refid="std.classpath"/>
      <pathelement location="${work.home}"/>
    </path>
  </target>

  <!-- do everything but install -->
  <target name="all" depends="clean,jar"
          description="Clean work dirs, compile, make JAR."/>

  <!-- clean old cruft out of our way -->
  <target name="clean"
          description="Delete old work and dist directories.">
    <delete dir="${work.home}"/>
  </target>

  <!-- make new dist and work trees -->
  <target name="prepare" depends="clean"
          description="Create working dirs and copy static files to work dir">
    <mkdir dir="${work.home}"/>
  </target>

  <!-- compile *.java to *.class -->
  <target name="compile" depends="prepare,classpath"
          description="Compile Java sources to ${work.home}">
    <javac srcdir="${src.home}" destdir="${work.home}" debug="true"
           includeAntRuntime="false">
      <classpath refid="compile.classpath"/>
    </javac>
  </target>

  <!-- make .jar file -->
  <target name="jar" depends="compile" description="Create JAR file.">
    <jar destfile="${jar.name}">
      <zipgroupfileset dir="${lib.home}" includes="*.jar"/>
      <fileset dir="${work.home}"/>
    </jar>
  </target>

</project>