checkstyle.xml

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

    <!-- Configure checker to use UTF-8 encoding -->
    <property name="charset" value="UTF-8"/>
    <!-- Configure checker to run on files with these extensions -->
    <property name="fileExtensions" value=""/>
    <!-- For detailed checkstyle configuration, see https://github.com/spring-io/nohttp/tree/master/nohttp-checkstyle -->
    <module name="io.spring.nohttp.checkstyle.check.NoHttpCheck">
        <property name="whitelist" value="http://maven.apache.org/POM/4.0.0&#10;
            http://www.w3.org/2001/XMLSchema-instance&#10;http://maven.apache.org/maven-v4_0_0.xsd"/>
    </module>
    <!-- Allow suppression with comments
       // CHECKSTYLE:OFF
       ... ignored content ...
       // CHECKSTYLE:ON
    -->
    <module name="SuppressWithPlainTextCommentFilter"/>
</module>