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via by Unknown author, 1 year ago
java.lang.NoSuchMethodError: org.drools.util.CompositeClassLoader.clone()Lorg/drools/util/CompositeClassLoader;	at com.vaadin.event.ListenerMethod.receiveEvent(	at com.vaadin.event.EventRouter.fireEvent(	at com.vaadin.ui.AbstractComponent.fireEvent(	at com.vaadin.ui.Button.fireClick(