Stop the Documentum Java Method Server.
Take a backup copy of the following XML file from the Content Server.
server.xml from the following location
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/deploy/jboss-web.deployer
Jboss-Service.xml from the following locations
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/deploy/acs.ear/APP-INF/classes/jmx.properties
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/deploy/ejb3.deployer/META-INF/jboss-service.xml
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/conf
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/deploy/ejb3.deployer/META-INF
$DOCUMENTUM_SHARED/jboss4.2.0/server/DctmServer_MethodServer/deploy/http-ivoker.sar/META_INF
"server.xml" is the actual file where the JBoss ports 9080 and other ports are given. Change the port number in the server.xml corresponding to your requirement.
Change the ports in all the jboss-service.xml as directed above.
Note: JBoss uses 10 continuous ports. e.g. you have mentioned 9080, JBoss uses all ports from 9080 to 9089
Make sure you take note of all the port series that you have changed.
Also you need to change the following objects to reflect the correct information.
Server Config object
ACS Config object