Injecting Managed beans in JSF 2.0

In JSF 2.0, a new

@ManagedProperty

annotation is used to dependency injection (DI) a managed bean into the property of another managed bean.

Let see a

@ManagedProperty

example :

MessageBean.java – A managed bean named “message“.

import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name="message")
@SessionScoped
public class MessageBean implements Serializable {

//business logic and whatever methods...

}

HelloBean.java – Inject the “message” bean into the “messageBean” property.

import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.SessionScoped;

@ManagedBean
@SessionScoped
public class HelloBean implements Serializable {

@ManagedProperty(value="#{message}")
private MessageBean messageBean;

//must povide the setter method
public void setMessageBean(MessageBean messageBean) {
this.messageBean = messageBean;
}

//...
}

In this example, it uses the

@ManagedProperty

annotation to DI the “message” bean (

MessageBean.java

) into the property (

messageBean

) of the “

hello

” bean (

HelloBean.java

) via setter method,

setMessageBean()

.

Note

To make this injection successful, the inject property (messageBean) must provide the setter method.