Web server

Here are the basic/central steps to take.

1. Install mod_jk (and mod_rewrite).
   sudo aptitude install libapache2-mod-jk libapache2-mod-rewrite
2. Adjust jk.conf.
   sudo vi /etc/apache2/mod-available/jk.conf
   
JkWorkersFile /etc/apache2/workers.properties
JkLogFile /var/log/apache2/jk.log
JkLogLevel error
JkMount /jetty/* jetty
JkOptions +ForwardURIEscaped

3. Add JK instance to workers.properties.
   sudo vi /etc/apache2/workers.properties
   
worker.list=jetty
worker.jetty.port=8009
worker.jetty.host=localhost
worker.jetty.type=ajp13

4. Enable mod_jk.
   sudo a2enmod jk
5. Enable mod_rewrite.
   sudo a2enmod rewrite
6. Add virtual host conf.
   sudo vi /etc/apache2/sites-available/app.example.com
   
<VirtualHost *>
ServerName app.example.com
...
RewriteEngine on
RewriteRule ^(.*) /jetty/app$1 [L,PT]
...
</VirtualHost>

7. Enable site.
   sudo a2ensite app.example.com
8. Reload Web Server conf.
   sudo /etc/init.d/apache2 reload

Some mod_jk properties are not supported by resp. not working right with Jetty (as opposed to Tomcat), e.g.:
socket_timeout, socket_keepalive, connect_timeout

Have fun! :-)