First create an Eclipse project for your source, if you havenโt already done so, by choosing File> New> Java Project. Then select Create Project from Existing Source and customize your project. At this point, your source will be uploaded to Eclipse, but the project build path may not be configured correctly and you may see build errors.
Alternatively , if your source application tree already contains a .project file, either because you previously worked on it in Eclipse, or because it was generated by a tool, such as GWT webAppCreator, you can import by choosing File> Import > General and Select Existing Projects in the Workspace
To enable the Google Web Toolkit, right-click it and select Google> Web Toolkit Settings. Check the "Use Google Web Toolkit" box and click "OK" to apply the changes.
Enabling the application for your project is similar: right-click your project and select Google> Application Settings. Check the "Use Google App Engine" box and click "OK."
Source : https://developers.google.com/eclipse/docs/existingprojects
source share