Using GWT Development Mode will launch the CodeServer and a embedded Jetty web server by default. There will start two servers, the first being the Jetty web server and the CodeServer which will listen for compile requests from the browser.
- DevMode will run the Super DevMode
CodeServerby default in GWT 2.7.0+. - Mobile debugging uses the web server on the device.
Reference
war Argument
Use the -war output/to/warDir to direct the compiler to put the output in the war directory. This argument is sent to the -launcherDir in the CodeServer. This prevents from having to use the bookmarklets.
bindAddress Argument
Use the -bindAddress 0.0.0.0 to bind on every IP address.
Launching
Create and reuse a launcher by right clicking on the project and going to the Debug As and then to GWT Development Mode with Jetty. Once started the compiler will ouput into the console then open GWT Development View with links to open the browser.
First create a launcher by right clicking on the project and going to GWT Development Mode with Jetty. 
Then open the browser by right clicking on URL 
Changing Program Arguments
After a launcher has been created you can change the arguments. Goto the Debug Configurations and choose the GWT Development Mode (DevMode) launcher configuration.
- Find the available program arguments here: DevMode Arguments
First choose the Debug Configurations 
Then choose the GWT Development Mode (DevMode) and then choose the launcher created. 
