Double check that the src directory is included in the run configuration under the Classpath tab. Eclipse can be too smart and know to find the java files from the Build Path without necessarily including them in the classpath, but the GWT compiler needs to be able to find them there. If you don't see src, you can do Advanced, Add Folders, and select the Project/src directory.
This should all be handled automatically if you install the Eclipse plugin. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.