A simple plugin to make jalopy available to you.

Your maven.xml might look something like this:
  
  <goal name="format" prereqs="jalopy:taskdef">
    <jalopy fileformat="unix"
            loglevel="info"
            threads="2">
      <fileset dir="src/test" >
        <include name="**/*.java" />
      </fileset>
    </jalopy>
  </goal>