Gerardo,
You may already have found the solution, but you can use ProxyPass and ProxyPassReverse in your apache config to forward traffic back to your appserver. For example, in your apache httpd.conf file:
ProxyPass /app1 http://10.0.1.100:8080/app1
ProxyPassReverse /app1 http://10.0.1.100:8080/app1
ProxyPass will hide your appserver and port details and use your apache server's address. Naturally, your httpd executable will need to have mod_proxy loaded up.
Henry