checkstyle/src/main/resources/check-license.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<!--
    Checkstyle configuration that checks the license headers
    expected by Open-O.
 -->

<module name = "Checker">
    <property name="charset" value="UTF-8"/>
    <property name="severity" value="warning"/>

    <module name="RegexpHeader">
        <property name="headerFile" value="${checkstyle.header.file}"/>
        <property name="multiLines" value="2"/>
    </module>
</module>