JSF Managed Property Example

by MemoryNotFound · Published July 27, 2015 · Updated July 27, 2015

This example shows how to use jsf managed property. When annotating a field with @ManagedProperty the values are set immediately after the bean’s construction and are available during @PostConstruct. Be informed that you can only use @ManagedProperty with beans managed by JSF @ManagedBean, not with beans managed by CDI @Named.

JSF Managed Property

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">
<h:body>

    <h1>JSF 2.2 Managed Property</h1>

    <h:form>
        <h:commandButton value="Send..." action="#{requestController.parametersAction()}">
            <f:param id="paramMP1" name="paramMP1Name" value="paramMP1Value"/>
            <f:param id="paramMP2" name="paramMP2Name" value="paramMP2Value"/>
        </h:commandButton>
    </h:form>

</h:body>
</html>

JSF Managed Property BackingBean

Warning: Keep in mind that @ManagedProperty is usable only with beans managed by JSF (@ManagedBean), not with beans managed by CDI (@Named).

package com.memorynotfound;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.RequestScoped;

@ManagedBean
@RequestScoped
public class RequestController {

    @ManagedProperty(value = "#{param.paramMP1Name}")
    private String param1MP;
    @ManagedProperty(value = "#{param.paramMP2Name}")
    private String param2MP;

    public String parametersAction(){
        return "result";
    }

    public String getParam1MP() {
        return param1MP;
    }

    public void setParam1MP(String param1MP) {
        this.param1MP = param1MP;
    }

    public String getParam2MP() {
        return param2MP;
    }

    public void setParam2MP(String param2MP) {
        this.param2MP = param2MP;
    }
}

Display Properties

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html">
<h:body>

    <h1>JSF 2.2 Managed Property</h1>

    <h4>Managed Property</h4>
    <p>#{requestController.param1MP}</p>
    <p>#{requestController.param2MP}</p>

</h:body>
</html>