When you call this url https://example.com
You are doing this:
https://127.0.0.1:443 or https://127.0.0.1:80
The ports 443 and 80 are of default for protocol http.
You have two way:
1) You configure the port in Jboss 80 or 443
2) You install Apache and configure mod_jk mod_proxy mod_cluster as load balancing