Before 2.7, you could easily run Dev Mode and production mode on the same servlet engine and switch between them without recompiling. For example, using a ant project generated using webAppCreator, launch dev mode like this:

ant devmode

In a separate window, compile to production mode:

ant gwtc

Then you could switch how you're running the GWT application between dev mode and production mode by adding or removing the gwt.codesvr parameter.

This no longer works in 2.7. The new behavior is that running "ant gwtc" disables Super Dev Mode.

There are two known workarounds:

1. restart devmode when you want to switch back
2. install the Super Dev Mode bookmarklets and use them to switch back and forth.

Issue tracked moved to github, see https://github.com/gwtproject/gwt/issues

Here is the Github issue: https://github.com/gwtproject/gwt/issues/8958