// MyApplicationServlet.java
import java.io.BufferedWriter;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import com.vaadin.terminal.gwt.server.ApplicationServlet;
public class MyApplicationServlet extends ApplicationServlet {
private static final long serialVersionUID = -7902572181303682675L;
protected void writeAjaxPageHtmlHeader(final BufferedWriter page, String title, String themeUri, final HttpServletRequest request) throws IOException {
page.append("");
}
}
// web.xml
sostituire servlet-class con: