How to use devModeArgs in net.ltgt.gwt.maven Plugin ?

Hello, 

I am trying to give the gwt dev mode additional options using devModeArgs :

                                      <devmodeArgs>

  <devmodeArg>-server com.google.appengine.tools.development.gwt.AppEngineLauncher</devmodeArg>

</devmodeArgs>

but I get an error when runnign gwt:devmode goal: Unknown argument: -server com.google.appengine.tools.development.gwt.AppEngineLauncher

is this the correct usage? 

Thanks. 

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