build.xml

<?xml version="1.0" encoding="utf-8" ?>
<project name="Main" default="build" basedir=".">
  <!-- Arguments to gwtc and devmode targets -->
  <property name="gwt.args" value="" />

  <!-- Configure path to GWT SDK -->
  <property name="gwt.sdk" location="/tmp/gwt-2.7.0" />

   <presetdef name="javac">
    <javac includeantruntime="false" />
  </presetdef>

  <path id="project.class.path">
    <pathelement location="war/WEB-INF/classes"/>
    <pathelement location="${gwt.sdk}/gwt-user.jar"/>
    <pathelement location="${gwt.sdk}/gwt-dev.jar"/>
    <pathelement location="${gwt.sdk}/validation-api-1.0.0.GA.jar"/>
    <pathelement location="${gwt.sdk}/validation-api-1.0.0.GA-sources.jar"/>
    <fileset dir="war/WEB-INF/lib" includes="**/*.jar"/>
    <fileset dir="lib" includes="**/*.jar"/>
    <!-- Add any additional non-server libs (such as JUnit) here -->
  </path>

  <target name="libs" description="Copy libs to WEB-INF/lib">
    <mkdir dir="war/WEB-INF/lib" />
    <copy todir="war/WEB-INF/lib" file="${gwt.sdk}/gwt-servlet.jar" />
    <copy todir="war/WEB-INF/lib" file="${gwt.sdk}/gwt-servlet-deps.jar" />
    <!-- Add any additional server libs that need to be copied -->
  </target>

  <target name="javac" depends="libs" description="Compile java source to bytecode">
    <mkdir dir="war/WEB-INF/classes"/>
    <javac srcdir="src" includes="**" encoding="utf-8"
        destdir="war/WEB-INF/classes"
        source="1.7" target="1.7" nowarn="true"
        debug="true" debuglevel="lines,vars,source">
      <classpath refid="project.class.path"/>
    </javac>
    <copy todir="war/WEB-INF/classes">
      <fileset dir="src" excludes="**/*.java"/>
    </copy>
  </target>

  <target name="gwtc" depends="javac" description="GWT compile to JavaScript (production mode)">
    <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler" maxmemory="256m">
      <classpath>
        <pathelement location="src"/>
        <path refid="project.class.path"/>
      </classpath>
      <arg line="-war"/>
      <arg value="war"/>
      <!-- Additional arguments like -style PRETTY or -logLevel DEBUG -->
      <arg line="${gwt.args}"/>
      <arg value="com.google.common.Geometry"/>
    </java>
  </target>

  <target name="devmode" depends="javac" description="Run development mode (pass -Dgwt.args=-nosuperDevMode to fallback to classic DevMode)">
    <java failonerror="true" fork="true" classname="com.google.gwt.dev.DevMode" maxmemory="1g">
      <classpath>
        <pathelement location="src"/>
        <path refid="project.class.path"/>
        <pathelement location="${gwt.sdk}/gwt-codeserver.jar"/>
      </classpath>
      <arg value="-startupUrl"/>
      <arg value="Main.html"/>
      <arg line="-war"/>
      <arg value="war"/>
      <!-- Additional arguments like -style PRETTY, -logLevel DEBUG or -nosuperDevMode -->
      <arg line="${gwt.args}"/>
      <arg value="com.google.common.Geometry"/>
      <arg value="com.google.common.Geometry"/>
    </java>
  </target>

  <target name="build" depends="gwtc" description="Build this project" />

  <target name="war" depends="build" description="Create a war file">
    <zip destfile="Main.war" basedir="war"/>
  </target>

  <target name="clean" description="Cleans this project">
    <delete dir="war/WEB-INF/classes" failonerror="false" />
    <delete dir="war/main" failonerror="false" />
  </target>

</project>