I guess the best solution is this:
System.getProperty("superdevmode").equals("on")
(copied from https://gitter.im/gwtproject/gwt?at=5afb220db84be71db90bf92a)
but here are other solutions as well
https://stackoverflow.com/questions/26917060/detecting-super-dev-mode-from-within-gwt-app
--
You received this message because you are subscribed to the Google Groups "GWT
Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/d/optout.