source: tags/1.5.0/examples/google-app-engine/build.xml

<project default="compile">
  <!-- 
       'sdk.dir' contains the location of the Google AppEngine for Java SDK
       http://googleappengine.googlecode.com/files/appengine-java-sdk-1.4.3.zip
  -->
  <property name="sdk.dir" 
            location="${user.home}/work/appengine-java-sdk-1.4.3/" />
  <import file="${sdk.dir}/config/user/ant-macros.xml" />

  <path id="project.classpath">
    <pathelement path="war/WEB-INF/classes" />
    <fileset dir="war/WEB-INF/lib">
      <include name="**/*.jar" />
    </fileset>
    <fileset dir="${sdk.dir}/lib">
      <include name="shared/**/*.jar" />
    </fileset>
  </path>

  <property name="abcl.dir"
            location="${basedir}/../.."/>

  <target name="resources.copy"
          depends="compile.lisp,abcl.jar"
    description="Copies the necessary resources to the WAR.">
    <copy
        todir="war/WEB-INF/lib"
        flatten="true">
      <!--
      <fileset dir="${sdk.dir}/lib/user">
        <include name="**/*.jar" />
      </fileset>
      -->
      <fileset dir="${abcl.dir}">
        <include name="dist/*.jar" />
      </fileset>
    </copy>
    <copy
        todir="war/fasls">
      <fileset dir="src">
        <include name="*.abcl" />
      </fileset>
    </copy>
  </target>
  
  <target name="compile"
          depends="compile.java,compile.lisp"/>

  <target name="compile.java" depends="resources.copy,abcl.jar"
    description="Compiles Java source and copies other source files to the WAR.">
    <mkdir dir="war/WEB-INF/classes" />
    <copy todir="war/WEB-INF/classes">
      <fileset dir="src">
        <exclude name="**/*.java" />
      </fileset>
    </copy>
    <javac srcdir="src"
           destdir="war/WEB-INF/classes"
           classpathref="project.classpath"
           includeantruntime="false"
           debug="on" />
  </target>
  
  <property name="abcl.jar" value="${abcl.dir}/dist/abcl.jar"/>
  <target name="compile.lisp" depends="abcl.jar">
    <java fork="true"
          classpath="${abcl.jar}"
          classname="org.armedbear.lisp.Main"
          inputstring="(compile-file &quot;${basedir}/src/first-servlet.lisp&quot;)">
      <arg value="--noinit"/>
    </java>
  </target>

  <available file="${abcl.jar}" property="abcl.jar.p"/>
  <target name="abcl.jar" unless="abcl.jar.p">
    <ant dir="${abcl.dir}" target="abcl.jar"/>
  </target>

  <target name="clean" description="Cleans all the jars, classes, and FASLs.">
    <delete>
      <fileset dir="${basedir}">
        <include name="**/*.jar" />
        <include name="**/*.class" />
        <include name="**/*.abcl" />
      </fileset>
    </delete>
  </target>

  <target name="runserver" 
          depends="compile,resources.copy"
    description="Starts the development server.">
    <dev_appserver war="war" />
  </target>

  <target name="runserver-debug" depends="compile"
    description="Starts the development server.">
    <dev_appserver war="war" port="8888"/>
  </target>
  
  <target name="update" depends="compile"
          description="Uploads the application to App Engine.">
    <appcfg action="update" war="war" />
  </target>
   
</project>