All Gwt jre emulation code goes in this module, as well as any gwt-compiler overrides. xapi-gwt-api.jar must come before gwt-dev.jar on your compile classpath. A plugin is being built to automatically adjust maven runtime dependencies, but users of ant or IDEs will need to ensure the super jar comes before gwt-dev. We will petition gwt to accept our mods, but, until then, if you want bleeding edge features, you gotta do bleeding edge configuration. Code that ties ...