If you have a conflict with another application, you can change the JBoss configuration for a service's ports. In the case of port 1098, this port binding is configured in the conf/jboss-service.xml file of your server. Change the port number in the configuration file and restart the server.
If your conflict occurs because you have multiple JBoss servers running on the same machine, you should review instructions on how to cluster JBoss on a single machine. Your choices basically are to use multiple IP addresses or the service binding manager.