I’m using GWT and SmartGWT in multiple projects. Since I had to reinstall Eclipse and all its plugins, Google Plugin for Eclipse included, I got an upgraded GWT SDK.
Many projects I have were failing to run with the following exception:
No source code is available for type com.google.web.bindery.event.shared.EventBus
I found the solution here.
You can’t use GWT 2.3 yet.