If a use sets accidentally/intentionally the rvn parameter in the url to an incorrect value the following exception is thrown:

java.lang.NumberFormatException: For input string: "1test"
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:456)
java.lang.Integer.parseInt(Integer.java:497)
com.icesoft.faces.webapp.http.core.MultiViewServer.service(MultiViewServer.java:50)
com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:24)
com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet.service(MainSessionBoundServlet.java:160)
com.icesoft.faces.webapp.http.servlet.SessionDispatcher$1.service(SessionDispatcher.java:38)
com.icesoft.faces.webapp.http.servlet.ThreadBlockingAdaptingServlet.service(ThreadBlockingAdaptingServlet.java:19)
com.icesoft.faces.webapp.http.servlet.EnvironmentAdaptingServlet.service(EnvironmentAdaptingServlet.java:63)
com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:55)
com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:23)
com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:91)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)

It may be better than handle this in a more graceful way.