[jboss-as7-dev] Port conflict 8080 detection?

I already have other servers running on port 8080, and then forgetfully starting AS7 standalone server, and it started successfully without any complaints. The main root page localhost:8080 stills displays the content from the other server, but localhost:9990 does display as7 management console. Is there a port conflict detection, or is it designed this way? I think it would be helpful to fail fast once a port conflict is detected. Cheng