My apologies for the sparse subject (7.4.0) - it should be much more specific (can it be edited after submission?).

Attempting to upgrade to 7.4.0 (from 7.3.9) - required adjustment to JSON code (to use elemental.json [replaced org.json]
Using VALO.

When running the application there is a dialog that indicates it cannot find the

Feb 28, 2015 11:22:56 AM com.vaadin.server.VaadinServlet serveStaticResourcesInVAADIN

INFO: Requested resource
[/VAADIN/widgetsets/com.jgk.app.vaadin.AppWidgetSet/com.jgk.app.vaadin.AppWidgetSet.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.

Any suggestions?

Thanks in advance,


Hey John,

Even I used to get his kind of errors, Below is the checklist I have compiled till date to resolve this sort of errors

  • Check the name of the compiled widgetset matches with the configured one
  • Check is widgetset is compiled successfully
  • Check if the compiled widgetset is part of the deployable
  • Try doing a clean build with compiling the widgetset again
  • If you are running the app from eclipse, try removing the app and redeploying to your container
  • lastly, clear your browser cache - the chances for this are very rare.

Please note that this list was compiled based on my experience in troubleshooting this issue.


Great information Krishna! Thank you.

It turned out to be the eclipse (remove app and redeploy).

Thank you again,