(Quick Reference) # 2.8 Running and Debugging an Application Version: 3.2.8 ## 2.8 Running and Debugging an Application Grails applications can be run with the built in Tomcat server using the run-app command which will load a server on port 8080 by default:
    grails run-app
You can specify a different port by using the `-port` argument:
    grails run-app -port=8090
Note that it is better to start up the application in interactive mode since a container restart is much quicker:
    $ grails
    grails> run-app
    | Grails application running at http://localhost:8080 in environment: development
    grails> stop-app
    | Shutting down application...
    | Application shutdown.
    grails> run-app
    | Grails application running at http://localhost:8080 in environment: development
You can debug a grails app by simply right-clicking on the `Application.groovy` class in your IDE and choosing the appropriate action (since Grails 3). Alternatively, you can run your app with the following command and then attach a remote debugger to it.
    grails run-app --debug-jvm
More information on the run-app command can be found in the reference guide. | Quick Reference (hide)