WorldGuard/config/checkstyle/import-control.xml

<!DOCTYPE import-control PUBLIC
    "-//Puppy Crawl//DTD Import Control 1.1//EN"
    "http://www.puppycrawl.com/dtds/import_control_1_1.dtd">

<import-control pkg="com.sk89q">
  <allow pkg="java"/>
  <allow pkg="javax"/>
  <allow pkg="org.junit"/>
  <allow pkg="org.hamcrest"/>
  <allow pkg="org.mockito"/>
  <allow pkg="junit.framework"/>
  <allow pkg="com.sk89q"/>
  <allow pkg="com.google.common"/>

  <subpackage name="worldguard">
    <allow pkg="org.khelekore"/>
    <allow pkg="org.flywaydb"/>
    <allow pkg="org.yaml"/>
    <allow pkg="org.json"/>
    <allow pkg="org.enginehub.piston"/>

    <subpackage name="bukkit">
      <allow pkg="org.bukkit"/>
      <allow pkg="org.bstats.bukkit"/>
    </subpackage>

    <subpackage name="sponge">
      <allow pkg="org.spongepowered"/>
      <allow pkg="org.bstats.sponge"/>
      <allow pkg="com.flowpowered"/>
    </subpackage>

    <subpackage name="forge">
      <allow pkg="net.minecraft"/>
      <allow pkg="net.minecraftforge"/>
    </subpackage>
  </subpackage>

</import-control>