checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
        "https://checkstyle.org/dtds/configuration_1_3.dtd">

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

    <module name="TreeWalker">
        <module name="IllegalImport">
            <property name="regexp" value="true"/>

            <!--
                Disallow star imports of Guice to avoid conflicts between "com.google.inject.Module"
                and "java.lang.Module" from JDK9+
            -->
            <property name="illegalClasses" value="^com\.google\.inject\.\*"/>

            <!--
                Allow sun.* packages for the Kerberos support in the Ansible plugin
            -->
            <property name="illegalPkgs" value=""/>
        </module>
    </module>
</module>