Otdfbt

Using that answer: How to redirect traffic on port 80 to Tomcat port 8080 whilst still allowing the server to send/receive on port 80

I've configured my apache2 server to redirect some requests to glassfish on 8080:

<VirtualHost *:80>
(...)
ProxyPass /tomcat/ http://localhost:8080/
ProxyPassReverse /tomcat/ http://localhost:8080/
ProxyPass /tomcat-admin/ http://localhost:4848/
ProxyPassReverse /tomcat-admin/ http://localhost:4848/
</VirtualHost>

On http://my.server.org/tomcat/ , I can clearly see:

 GlassFish Server 3.1.2
Your server is now running

but http://my.server.org/tomcat-admin/ returns a blank screen , but I can see the HTML source of the admin page, so I suppose that some resources cannot be loaded. How should I fix this ?

Another question: if my java web application use httpS, should I just add:

ProxyPass /tomcat-secure/ http://localhost:8443/
ProxyPassReverse /tomcat-secure/ http://localhost:8443/
</VirtualHost>

?

Unfortunately I don't know anything about that apache-proxy stuff. However, I had a similar problem and my workaround may help you to solve your issue.

I fully integrated tomcat into apache using mod-jk. Assuming you're using a Debian-based distro just install libapache2-mod-jk and configure the module in /etc/libapache2-mod-jk/workers.properties. You may need something like this:

worker.ajp13_worker.port=8009
worker.ajp13_worker.host=localhost
worker.ajp13_worker.type=ajp13

These parameters define the connection between apache and tomcat. I told tomcat to only listen to 127.0.0.1. But it should be fine to configure the module to speak to another IP and/or a different port if you need a standalone tomcat installation available without apache.

Next step: Open /etc/apache2/mods-available/jk.conf and make sure that apache reads these properties:

JkWorkersFile /etc/libapache2-mod-jk/workers.properties

If that is done, the communication between apache and tomcat should work. Now you can create some hosts forwarding their requests to tomcat:

<VirtualHost *:80>
 [...]
 ServerName your.host.tld
 [...]
 RewriteEngine on
 RewriteRule ^/(.*)$ /YourContext/$1 [L,PT]
 JkMount /* ajp13_worker
 [...]
</VirtualHost>

This virtual host will forward each request to the context YourContext at tomcat. ajp13_worker is the worker-definition as previously configured in /etc/libapache2-mod-jk/workers.properties (of course you can configure multiple workers for different IPs/ports) and the RewriteRule rewrites the query to prefix it with YourContext. So you also need the rewrite module, if it's not already enabled. Enable the modules and this host:

a2enmod jk
a2enmod rewrite
a2ensite 007-what-ever-host
service apache2 restart
service tomcat7 restart

and go for http://your.host.tld/abc?some=query. You'll hopefully end up with the same result as if you call http://your.host.tld:8080/YourContext/abc?some=query.

Hope that helps ;-)