Configure Managed Beans in JSF 2.0
Posted on
, Last modified :
August 29, 2012
By mkyong
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)
Tags : jsf2 managed bean
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Why use this line below in bean
Private static final long serialVersionUID = 1l;
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
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!