Found a java guy here locally that helped me with this. It looks like HexUtils
was moved to tomcat-coyote.jar. Added that to my classpath and it works now.
The url I mentioned below should probably be updated though.
Since upgrading to Tomcat 7.0.16, the command line noted at
http://tomcat.apache.org/tomcat-7.0-doc/realm-howto.html hasn't worked for me.
I've been unable to find any answers from google, other than some references
that seem to say I'm missing tomcat-util.jar on my classpath (which I'm not).
