MyCart.java
This MyCart Bean, is CDI Named bean Instantiated per HTTP Session.
package cdv.project.bean;
import cdv.project.api.*;
@Named("cart")
@SessionScoped
public class MyCart extends MyCartAbstract {
private String value;
@Override
public String getValue() {
System.out.println("Getting Value Value to : "+ this.value);
return this.value;
}
@Override
public void setValue(String a) {
System.out.println("Setting Value to : "+ a);
this.value = a;
System.out.println("Setting Value to ddd: "+ this.value);
}
}
Abstract Class
package cdv.project.api;
public abstract class MyCartAbstract {
public abstract String getValue();
public abstract void setValue(String a);
}
Problem Description
For just Understanding the Session Scoped CDI.
I have two JSP File as Follows
1) SetCDIBeanValue.jsp
In which, I would get the Instance of the Named Session CDI Bean ( MyCart )
Set the Value of It String Property to "FROM_FIRST_JSP"
Since this Session scoped there should be only one Session Instantiated I guess.
2) GetCDIBeanValue.jsp
In Which, I would retrieve the Bean Property Value that was set from First JSP, and show it in Paragraph.
How ever getFromSecondJsp.getValue() always return NULL
I know, there is some mistake and not have understood the concept well.
But will it be possible that some one let me know where I am making a Mistake.
Thanks .
SetCDIBeanValue.jsp
<%@ page import="cdv.project.api.*" %>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
MyCartAbstract SetFromFirstJsp = (MyCartAbstract) UIBeanLocator.getBeanByName("cart");
# Getting the Session Instantiated Bean by its Name
SetFromFirstJsp.setValue("FROM_FIRST_JSP");
%>
GetCDIBeanValue.jsp
<%@ page import="cdv.project.api.*" %>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
MyCartAbstract getFromSecondJsp = (MyCartAbstract) UIBeanLocator.getBeanByName("cart");
# Getting the Session Instantiated Bean by its Name
%>
<html>
<head>
<%@include file="SetCDIBeanValue.jsp"%>
</head>
<body>
<p>
<%
out.print("Get Bean Property Value: " + getFromSecondJsp.getValue());
%></p>
</body>
</html>
Always Show the following in the Browser when Launching the GetCDIBeanValue.jsp
Get Bean Property Value: null
I am getting back the Instance of the Bean as follow
public static Object getBeanByName(String name) {
BeanManager bm = getBeanManager();
Set<Bean<?>> beans = bm.getBeans(name);
Bean bean = beans.iterator().next();
CreationalContext ctx = bm.createCreationalContext(bean);
Object o = bm.getReference(bean, bean.getBeanClass(), ctx);
return o;
}
WebServer
GlassFish Server Used
Thanks and Regards
Durai Velan C.
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