i doing simple navigation example in jsf beginner. getting null when accessing f:param value in managedbean using managedproperty
home.xhtml
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/facelets"> <head> <title>jsf tutorial!</title> </head> <body> <h3>using jsf outcome</h3> <h:form> <h:commandbutton action="#{navigation.show}" value="page1"> <f:param name="pageid" value="1" /> </h:commandbutton> <h:commandlink action="#{navigation.show}" value="page2"> <f:param name="pageid" value="2" /> </h:commandlink> <h:commandlink action="#{navigation.show}" value="home"> <f:param name="pageid" value="3" /> </h:commandlink> </h:form>
navigation.java
package com.jason.jsf; import java.util.map; import javax.faces.bean.managedbean; import javax.faces.bean.managedproperty; import javax.faces.bean.requestscoped; import javax.faces.context.facescontext; @managedbean(name = "navigation", eager = true) @requestscoped public class navigation { @managedproperty(value = "#{param.pageid}") private string pageid; public string show() { system.out.println("page id" + value); if (pageid == null) { return "home"; } if (pageid.equals("1")) { return "page1"; } else if (pageid.equals("2")) { return "page2"; } else { return "home"; } } public string getpageid() { return pageid; } public void setpageid(string pageid) { system.out.println("page id set" + pageid); this.pageid = pageid; } } how caused , how can solve it? using jsf2.2 mojarra 2.0.3.there other sample page1.xhtml , page2.xhtml navigation me in advance
look closer @ xml namespace prefix , uri , compare whatever shown in decent jsf book/tutorial/resource:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/facelets"> yes, xml namespace uri f: prefix wrong. declared 1 of facelets tags have ui: prefix. causes tags not interpreted @ all. it's being misinterpreted <ui:param> has entirely different meaning real <f:param>.
fix taglib uri. needs http://java.sun.com/jsf/core. here's complete set:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets"> see also:
- our jsf wiki page - contains hello world
unrelated concrete problem, mojarra 2.0.3 not jsf 2.2. it's jsf 2.0. , rather old implementation too, on 5 years already. can latest mojarra 2.2 (currently 2.2.11) @ http://javaserverfaces.java.net. after that, can change domain in taglib uris java.sun.com xmlns.jcp.org:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://xmlns.jcp.org/jsf/core" xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:ui="http://xmlns.jcp.org/jsf/facelets"> 
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