JBoss Production Environment

In my humble opinion a JBoss production environment should be something like the one depicted in the following diagram



I recommend to use mod_proxy, mod_proxy_balancer and mod_proxy_ajp apache modules both for load balancing and request forwarding with directives like:

ProxyRequests Off
<Proxy balancer://webapp-cluster>
    Order deny,allow
    Allow from all
    BalancerMember   ajp://instance1:8009/webapp-name    loadfactor=1
    BalancerMember   ajp://instance2:8009/webapp-name    loadfactor=1
    ProxySet         lbmethod=bytraffic
</Proxy>
ProxyPass            /webapp-name     balancer://webapp-cluster
ProxyPassReverse     /webapp-name     balancer://webapp-cluster

System dimensions and load can vary the numbers, but the architecture should be sufficient and enough scalable for many situations.