Configure Apache to host Tomcat 7 on Ubuntu

If you don't have tomcat7 installed run:
aptitude install tomcat7

Configure Tomcat
------------------

Edit /var/lib/tomcat7/conf/server.xml
Uncomment the line:
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
to tell Tomcat to use connector protocol on port 8009 for connection with Apache.

Restart tomcat:
/etc/init.d/tomcat7 restart

Check whether the connector is working with:
netstat -ln | grep :8009


Configure Apache
------------------

Install module for apache which will be used to connect to Tomcat:
apt-get install libapache2-mod-jk

Edit /etc/apache2/sites-available/default
and add JkMountCopy On in the <VirtualHost *:80> section

...
DocumentRoot  /var/www
JkMountCopy   On
...

Edit /etc/apache2/mods-enabled/jk.conf

<IfModule jk_module>
    JkWorkersFile /etc/libapache2-mod-jk/workers.properties
    JkLogFile /var/log/apache2/mod_jk.log
    JkLogLevel info
    JkShmFile /var/log/apache2/jk-runtime-status
    JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
    JkMount /YouApplicationName/* ajp13_worker
    JkMount /YouApplicationName ajp13_worker
</IfModule>


Note:
---------
the path should be accessible from Tomcat7 under the same application name as well. i.e:
localhost:8080/YourApplicationName

This is because Apache hosts your tomcat7's specific path.