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Web Component Certification (OCEJWCD)

Stumped !! HFSJ : Page 550 : Q3

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posted 18 years ago

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I know this question has been put up in errata list as having no correct answers.

As per my understanding , container will pass a TagAdpater object wrapping the <siimple Tag 2> , when calling the setParent() method for <classic tag 3> .

So calling a getParent() in <classic tag 3> with return the reference to TagAdapter and calling getParent() on the Tag Adapter reference should give us a reference to the <classic tag 1>

Please point out where my understaning is wrong .
[ September 25, 2006: Message edited by: Vivek Pandey ]

Vikrant Pandit

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posted 18 years ago

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So calling a getParent() in <classic tag 3> with return the reference to TagAdapter and calling getParent() on the Tag Adapter reference should give us a reference to the <classic tag 1>

That's right. And getAdaptee() will return a reference to simple tag 2.
That is an interesting point.

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Vikrant Pandit

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posted 18 years ago

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So does it mean that option C is after all correct !!! ???

Vikrant Pandit

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posted 18 years ago

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I tried out the following code snippets

The Classic Tag

The Simple Tag

The jsp

The output is

## parent is javax.servlet.jsp.tagext.TagAdapter@1d4eeb5
## parent is edu.scwcd.tags.classic.MyClassicTag1@83e35b
## parent is null <-- From the nested classic tag
## parent is null <-- From the top level classic tag

My conclusion is that option C is correct and errata list is wrongly updated

I hope the authors of HFSJ will have something to say about it !!

Vikrant Pandit

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posted 18 years ago

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Sorry to bump it up like this ....

But somebody share your thoughts on this .... am I making a glaring ,istake ?

or is the errata list wrongly updated (hard to digest)?

Vikrant Pandit

Dilshan Edirisuriya

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posted 18 years ago

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I also agree. Yes as far as I know, invoking getParent() on a classic tag will execute getAdaptee().getParent(). So the simple tag which is adapted to the classic tag will be returned by calling getParent()

Someone clarify me if I'm wrong

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

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