Sometimes you are forced to work multiple projects at a time, using two work-spaces using IDE's like MyEclipse or Eclipse or NetBeans. In this situation you should run both the Tomcat servers to test your changes at a time from your local. If you run both Tomcat servers at a time from different workspaces you will get the error message as showing below:

"Port 8080 required by Tomcat v8.0 Server at localhost is already in Use."