JSF 2 Injecting Managed Beans Example

This tutorial intended for providing a complete example of how could wire (connect/inject/reference) a managed beans from/into another managed bean. In our previous tutorial I have explained how to configure a managed bean.

Also Read:

• JSF 2 Tutorials
• JSF Tutorials
• Introduction to JSF

1. IndexBean Managed Bean

IndexBean.java

[code lang=”java”]
package net.javabeat.jsf;

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

@ManagedBean
@SessionScoped
public class IndexBean {
private String message = "We Have Two Injected Beans :";
@ManagedProperty(value="#{jpaTutorialBean}")
private JPATutorialBean jpa;
@ManagedProperty(value="#{jsfTutorialBean}")
private JSFTutorialBean jsf;

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

public JPATutorialBean getJpa() {
return jpa;
}

public void setJpa(JPATutorialBean jpa) {
this.jpa = jpa;
}

public JSFTutorialBean getJsf() {
return jsf;
}

public void setJsf(JSFTutorialBean jsf) {
this.jsf = jsf;
}

public String display(){
this.message = this.message + " "+this.jpa+" And "+this.jsf;
return "";
}
}
[/code]

2. JPATutorialBean

JPATutorialBean.java

[code lang=”java”]
package net.javabeat.jsf;

public class JPATutorialBean {
private String message ="This is a JPATutorialBean";

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}
}
[/code]

3. JSFTutorialBean

JSFTutorialBean.java

[code lang=”java”]
package net.javabeat.jsf;

public class JSFTutorialBean {
private String message = "This is a JSF Tutorial Bean";

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}
}
[/code]

4. JSF Faces Configuration

faces-config.xml

[code lang=”xml”]
<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
<application>
<resource-bundle>
<base-name>net.javabeat.jsf.application</base-name>
<var>msg</var>
</resource-bundle>
</application>
<managed-bean>
<managed-bean-name>jpaTutorialBean</managed-bean-name>
<managed-bean-class>net.javabeat.jsf.JPATutorialBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<managed-bean>
<managed-bean-name>jsfTutorialBean</managed-bean-name>
<managed-bean-class>net.javabeat.jsf.JSFTutorialBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
</faces-config>
[/code]

5. The Deployment Descriptor (web.xml)

web.xml

[code lang=”xml”]
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5" metadata-complete="true">
<context-param>
<description>State saving method: ‘client’ or ‘server’
(=default). See JSF Specification 2.5.2
</description>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<context-param>
<param-name>javax.faces.application.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
</web-app>
[/code]

6. The View

index.xhtml

[code lang=”xml”]
<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:head>
<h:outputScript library="javax.faces" name="jsf.js"/>
</h:head>
<h:body>
<f:view>
<h1>JavaBeat JSF 2.2 Examples</h1>
<h2>JSF2 Injecting Managed Bean Example</h2>
<h:form prependId="false">
<h:commandButton value="List All Injected Beans" action="#{indexBean.display}"></h:commandButton>
<h:outputText style="color:black" value="#{indexBean.message}"></h:outputText>
</h:form>
</f:view>
</h:body>
</html>
[/code]

7. JSF 2 Injecting Managed Beans Demo

The below snapshot shows you a message print out all injected beans instances.

[wpdm_file id=36]