Can we Configure Multiple JBoss Instances On One Machine?

we have jboss running in other machine (remote and x-windows) and already deployed the application in that server. Now we need to flip the working environment to remote(i.e. we are connecting the eclipse from xming server and workset is in remote location) and run our development application in that machine. Here the old application is already running in on jboss server and for the development, can we use another jboss instance? how can we do it? what if we use other instance in that machine?

Yes you can run multiple Jboss instances on one host. But you need to make sure that the other instance is configured with different port. If not, you will get port already in use exceptions and deployment will fail. Search on net for running multiple jboss on one host. I am not sure, but you can check jboss documentation for any info.

See this: http://community.jboss.org/wiki/ConfiguringMultipleJBossInstancesOnOnemachine

Also, chapter 15 of JBoss in Action covers this area in detail.