ant/check.xml

<project default="checkstyle" name="CheckAnt">
  <property name="java.dir" value="src/main"/>
  <property name="tocheck" value="**/*.java"/>  

  <target name="checkstyle">
    <taskdef name="checkstyle"
             classname="com.puppycrawl.tools.checkstyle.CheckStyleTask"/>
    <checkstyle headerFile="src/etc/RequiredHeader.txt"
                headerIgnoreLine="4"
                allowProtected="true">
      <fileset dir="${java.dir}">
        <include name="${tocheck}"/>
      </fileset>
    </checkstyle>
  </target>
  
</project>