Web browsers by default will connect to port 80 for http and port 443 for https, if you are going to move the port to a different number the web browser needs to be told this which is why you must specify :90 in the URL.
I am running one instance of JBoss with the port number 80 and I need to run another instance of JBoss so I chosen 90 for http port. Please advice me how can I avoid port number 90 in URL of my second instance.
edit it to 90
I hope that helps