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jsp:useBean possible error in HFSJ

thomas jacob
Ranch Hand

Joined: May 19, 2005
Posts: 91
The exercise in the HFSJ book is as follows

The STANDARD ACTION:
<jsp:useBean id="person" type="foo.Employee" >
<jsp:setProperty name="person" property="name" value="Fred" />
</jsp:useBean>

SERVLET CODE:
foo.Employee p = new foo.Employee();
p.setName("Evan");
request.setAttribute("person", p);

Question: What will the output for this be
<jsp:getProperty name="person" property="name" />

Answer in Book: The book states that this work fine and prints out Evan. The code inside the body of <jsp:useBean> will never run, since we specified a type without class.

I FEEL: IT SHOULD FAIL AT REQUEST TIME cos when the scope is not mentioned in the useBean tag, so it defaults to the page scope. When only the type is mentioned in the useBean tag there should be an existing attribute bean with the same name and scope. Here the scope is not same. The attribute bean exists in the request scope. The tag is searching in the page scope

The book anyhow contradicts the answer by saying when only the type is mentioned in the useBean tag there should be an existing attribute bean with the same name and scope

JAVARANCH GUYS PLEASE HELP....

Regards
Thomas
Deepak Bala
Bartender

Joined: Feb 24, 2006
Posts: 6661
    
    5

Yep this thought came across my head but i brushed it aside and and continued with the book. The scope attribute should have mentioned "request".


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Doyle Matt
Ranch Hand

Joined: Jul 05, 2004
Posts: 76
Yup Thomas, you are correct. Tried it out and I got an exception


SCJP 1.4
Niranjan Deshpande
Ranch Hand

Joined: Oct 16, 2005
Posts: 1277
This is where the head first gets clumsy
i have borken my head over this page as it has got an errata
but even after this the THING isnt yet clear, so i too BRUSHED the page aside and continued further


SCJP 1.4 - 95% [ My Story ] - SCWCD 1.4 - 91% [ My Story ]
Performance is a compulsion, not a option, if my existence is to be justified.
Dilshan Edirisuriya
Ranch Hand

Joined: Apr 22, 2006
Posts: 299
It's there in the errata

http://www.oreilly.com/catalog/headservletsjsp/errata/headservletsjsp.confirmed


Dilshan Edirisuriya SCJP1.4, SCWCD1.4, SCBCD 5
 
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