Vaadin Eclipse Widgetset Compilation
INFORMATION: Requested resource [/VAADIN/widgetsets/org.test.MyAppWidgetset/org.test.MyAppWidgetset.nocache.js] not found from filesystem or through class loader. Add widgetset and/or theme JAR to your classpath or add files to WebContent/VAADIN folder.
I run into this problem some time ago. I read thousands answers to this topic but never found something that helped. Then I noticed that if you run tomcat as an adapter in eclipse and you deploy your project into it, then sometimes after you have build your project, the target folder is not in sync with eclipse and you have to press F5 on it. After this action the widgetset could be loaded.