Beyond the level of what Javadoc does, DoctorJ compares documentation against
code. Among what it detects:
    * misspelled words
    * parameter and exception names:
          o missing
          o misordered
          o misspelled
    * Javadoc tags:
          o invalid
          o misordered
          o missing expected arguments
          o invalid arguments
          o missing descriptions
    * undocumented classes, methods, fields, parameters

WWW: http://doctorj.sourceforge.net/