In JSF 2.0, Java bean that can be accessed from JSF page is called Managed Bean. The managed bean can be a normal Java bean, which contains the getter and setter methods, business logic or even a backing bean (a bean contains all the HTML form value).
There are two ways to configure the managed bean :
1. Configure Managed Bean with Annotation
In JSF 2.0, you can annotated a Managed Bean with new @ManagedBean annotation.
package com.mkyong.common;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import java.io.Serializable;
@ManagedBean
@SessionScoped
public class HelloBean implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2. Configure Managed Bean with XML
With XML configuration, you can use the old JSF 1.x mechanism to define the managed bean in a normal faces-config.xml file.
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
<managed-bean>
<managed-bean-name>helloBean</managed-bean-name>
<managed-bean-class>com.mkyong.common.HelloBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
</faces-config>
Best Practice
It’s recommended to put the managed beans in a separate XML file because the faces-config.xml is used to set the application level configurations.
It’s recommended to put the managed beans in a separate XML file because the faces-config.xml is used to set the application level configurations.
So, you should create a new XML file and put the managed beans detail inside, and declared the XML file in the javax.faces.CONFIG_FILES initialize parameter, which is inside the WEB-INF/web.xml file.
web.xml
...
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>WEB-INF/manage-beans.xml</param-value>
</context-param>
...
Download Source Code
Download it – JSF-2-Managed-Beans-Example.zip (10KB)
Hello mkyong,
I have been able to create index.xhtml but when I create Managed Bean I run into compilation error even thought I did everything right. One thing I noticed is that I don’t see JSF Managed Bean either, instead I see JSF CDI bean. what do you thing the issue might be?
security loop hole in this comment session, please Improve you comment session.
I have problem with serialization, certain object can’t be serializabled, i use them in a ViewScoped ManagedBean, do you think i must implements Serializable in my ViewScoped beans or it is unuseful ?
Great!
http://goo.gl/P2XEv8
What is the use of tag in faces-config.xml file ?
I’m looking for similar solution for CDI bean. Is there any?
Here is question:
http://stackoverflow.com/questions/19159918/cdi-bean-configuration-using-beans-xml-file
Hi I have a doubt.I’ve followed your instructions on this tutorial but only the second approach works for me ( using faces-config ) the annotation way never has worked for me,am I missing something ?
I am also trying to figure out the same as I am also facing the same issue. Please enlighten me on the same if you found the answer to the question. Thanks in advance 🙂
Can u please tell me the difference between Backing Bean and Manged Bean ?
Is both are same ..?
Please replay ..
Why use this line below in bean
Private static final long serialVersionUID = 1l;
In the above example the class is implementing Serializable interface
@ManagedBean
@SessionScoped
public class HelloBean implements Serializable …
by default if the class is implementing Serializable,we need to provide serialVersionUID with in the class.
Hello Hi Mkyong,
thanks for you tutorials,it’s very helping ! i was wondering how to create an abstract bean on xml file thansk!
Hi Mkyong,
I have a question can you help me ,I got this when i try to run my first jsf application
org.apache.myfaces.config.annotation.TomcatAnnotationLifecycleProvider destroyInstance
INFO: Destroy instance of com.jsf2tut.model.MyBean
package com.jsf2tut.model; import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; @ManagedBean(name="myBean") @SessionScoped public class MyBean { private String myName; public String getMyName() { return myName; } public void setMyName(String myName) { this.myName= myName; } }I have another question please, I have a simple file called login.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:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:commandButton value="Click Here" action="index"></h:commandButton> </html>and this face-config.xml
when click on “Click here” button do nothing why?
Hi Mkyong,
Great tutorials! I tried this on a jetty server and found that the code snippet for splitting the config files fails with the following error:
SEVERE: Critical error during deployment:
com.sun.faces.config.ConfigurationException: java.util.concurrent.ExecutionException: javax.faces.FacesException: java.net.MalformedURLException: WEB-INF/faces-beans.xml
After some research I figured out that the path is incorrect, It should be:
So what i feel is that param-value needs to be set with root context (/WEB-INF/) and not with relative path (WEB-INF/).
Found from here: http://docs.oracle.com/javaee/6/api/javax/faces/webapp/FacesServlet.html#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
Thanks,
Again Great job!
you are right scuddy…It took some for me to figure that out.