setpropertyactionlistener

问题 I'm getting this error with f:setPropertyActionListener and i can't figure out why: HTTP Status 500 - For input string: "selectedItem" exception: javax.servlet.ServletException: For input string: "selectedItem" javax.faces.webapp.FacesServlet.service(FacesServlet.java:667) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause: java.lang.NumberFormatException: For input string: "selectedItem" java.lang.NumberFormatException.forInputString(Unknown Source) java.lang