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Could someone help me please. I use Vaadin 7.2.0 but I think the question is relevant to any version. I deploy the EAR file on Glassfish 4 using Eclipse. The packaging structure I try to build is: EAR /WAR file - only contain an empty servlet class annotated with @VaadinServletConfiguration /lib /ui.jar - jar file where I have UI class and theme /widgetset.jar - I compile few addons to this jar What happens is that - my theme works fine and all resources from ui.jar are loaded OK - my screen initialisation failes with missing xxx.nocache.js file from the widgetset I can see that the widgetset.jar is uploaded fine and all widgetset files are correctly created. I tried to put some other resources to the widgetset jar and neither is visible. How can I open resources from a EAR/lib/xxx.jar file to Vaadin?