jsf - Why does ${bean.property} auto-creates a bean in JSP? -

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i know jsp has been deprecated.

here, mentioned that

in jsp, ${} won't autocreate managed bean when it's not in scope yet. can use if can guarantee #{} on same managed bean been used somewhere before in component tree , take view build time vs view render time lifecycle account.

just check whether true or not, came this:

a simple jsp page this,

    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>     <html>         <head>         </head>         <body>              ${myplayersbean.playername}             here         </body>     </html>

where

@managedbean(name = "myplayersbean") @requestscoped public class playersbean {      private string playername = "rafael";     // getters & setters }

it outputs on hitting http://localhost:8080/leonard/faces/create.jsp:

rafael here

please suggest?

this statement,

in jsp, ${} won't autocreate managed bean when it's not in scope yet

is applicable when you're using jsf 1.1 or older or when you're using jsp 2.0 or older. since jsf 1.2 , jsp 2.1, jsf el unified jsp el , that's why started work (via javax.el.compositeelresolver).

nonetheless, using ${...} access jsf managed beans not recommended. not writable, while #{...} writable need use #{...} in input components. mixing ${...} , #{...} in same jsf page may end confusing future code readers/maintainers.


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