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Question about classic tags nesting in the context of body-content

 
Grzegorz Konczyk
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Hi all,
I'm preparing for my OCPJWCD exam and I've encounter some ambiguities with nesting classic tags with different body-content values.
Here are the specs:

1. my tag class (same class for every tag):

public class MyTag extends TagSupport throws JspException{
public int doStartTag(){
return EVAL_BODY_INCLUDE;
}
}

2. 3 different tags. No tag has any attribute. The difference is in body-content value:

<classicJSP> - this one has <body-content>JSP</body-content>
<classicTag> - this one has <body-content>tagdependent</body-content>
<classicScr> - this one has <body-content>scriptless</body-content>

I've done some different cases with these tags and here is what i've received:

a) <classicJSP><%= 1+2 %></classicJSP> - the result is: 3 (ok with me)
b) <classicTag><%= 1+2 %></classicTag> - the result is: <%= 1+2 %> (ok with me)
c) <classicJSP><classicJSP><%= 1+2 %></classicJSP></classicJSP> - the result is: 3 (ok with me)
d) <classicJSP><classicTag><%= 1+2 %></classicTag></classicJSP> - the result is: <%= 1+2 %> (NOT ok with me)
e) <classicTag><classicJSP><%= 1+2 %></classicJSP></classicTag> - the result is: <%= 1+2 %> (NOT ok with me)
f) <classicScr><classicJSP><%= 1+2 %></classicJSP></classicScr> - the result is: runtime error (ok with me - I guess)
g) <classicScr><classicTag><%= 1+2 %></classicTag></classicScr> - the result is: <%= 1+2 %> (NOT ok with me - relating to point f))

Ad d) I think result here should be 3. Inner <classicTag> produces <%= 1+2 %> and this goes to outer <classicJSP>, and the outer <classicJSP> evaluates this to 3.
Ad e) I think result here also should be 3. Inner <classicJSP> produces 3 and this goes to outer <classicTag>, which produces 3.
Ad f) I think I know that one - the outer <classicScr> see JSP expression inside inner <classicJSP> and this causes exception
Ad g) This related to point f) is mystery for me - why in f) there is exception and here is ok??

I would appreciate any of any of d), e), f)(if my thinking is correct) or g). Thanks very much in advance.
Kind regards,
grzego
 
It is sorta covered in the JavaRanch Style Guide.
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