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After Update from Vaadin 6.8.13 to 6.8.14 a have to build widgetsets.
But after update I got following warnings: [WARN] Widget class com.vaadin.terminal.gwt.client.ui.VScrollTable was not found. The component com.vaadin.ui.Table will not be included in the widgetset. [WARN] Widget class com.vaadin.terminal.gwt.client.ui.VTreeTable was not found. The component com.vaadin.ui.TreeTable will not be included in the widgetset.
GWT 2.6 adds a new method to the Timer class which conflicts with a Timer class used by VScrollTable (http://dev.vaadin.com/ticket/13397). Can probably be "fixed" in a project by importing (copy/pasting) the VScrollTable class and renaming isRunning() to something else (this is how Vaadin 7.2 fixes the incompatibility)