mod_jk is the way to go.
mod_proxy works as well, but JK is more configurable, plus it's very straight-forward to implement. The quickest intro is here: http://tomcat.apache.org/connectors-doc/generic_howto/quick.html
Add the following to httpd.conf (if you're using
VirtualHosts you can put portions in individual hosts.
# Load mod_jk module
# Update this path to match your modules location
LoadModule jk_module modules/mod_jk.so
# Where to find workers.properties
# Update this path to match your conf directory location (put workers.properties next to httpd.conf)
# Where to put jk logs
# Update this path to match your logs directory location (put mod_jk.log next to access_log)
# This can be commented out, to disable logging
# Set the jk log level [debug/error/info]
# Only matters if JkLogFile is being used.
# Select the timestamp log format
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
# Send everything for context /examples to worker named worker1 (ajp13)
# /examples would most likely be the name of your WebApp (c:/tomcat/webapps/example)
JkMount /examples/* worker1