Cannot cast an instance of "class jpa.entities.UserData (loaded by instance of org.glassfish.web.loader.WebappClassLoader(id=142))" to an instance of "class jpa.entities.UserData (loaded by instance of org.glassfish.web.loader.WebappClassLoader(id=129))"
dlaczego nie moge rzucic UserData u=(UserData) obiekt;
za pierwszym razem sie udaje za drugim juz nie.