Hi,
here are some comments to the answers of Eduardo Pelegri-Llopart. Somehow
user defined tags are not discussed on this list.
1. What is the return value of the methods doStartTag(), doEndTag()
respectively doAfterBody() in the support classes TagSupport and
BodyTagSupport?
The values you mention in your mail are not documented. The orion
application server behaves as follows:
TagSupport:
doStartTag() returns EVAL_BODY_INCLUDE (and not SKIP_PAGE)
doEndTag() returns EVAL_PAGE
2. How do the implementations of doEndTag() differ in the classes
TagSupport and BodyTagSupport?
It seems odd that BodyTagSupport overrides doEndTag but does not
override doStartTag. Since these classes will be subclassed by
users, overriding doEndTag() by super.doEndTag() is even more odd.
3. Is it possible to use the method getPreviousOut() of class
BodyTagSupport in the implementation of the methods doStartTag() or
doEndTag() in subclasses of BodyTagSupport? Or can these methods
only use pageContext.getOut()?
Using getPreviousOut() seems logical. Appartently the orion server
reports an error when doing so.
4. Why does the method doInitBody() in class BodyTagSupport not
include the clause throws JspError?
Bug in PR2, ok
5. What happend to the method public PageContext getPageContext() in
class Tag? Why was it deleted?
Providing pageContext as a protected field doesn't seem to be
consistent with the other J2EE APIs. There only very few protected
fields in these classes. Why did you choose pageContext as one of
them? Why is it safer?
6. What happened to the method public java.lang.String getTagName() in
class Tag? Why was it deleted?
I used it only for error reporting (as you mentioned). I found it
usefull, because introducing the tag name in the tag handler class
makes it harder to change tag names (it is redundant). Also if you
subclass tag handlers error reporting using getTagName() was easy.
Thanks for answering my questions! :-)
volker turau
FH Wiesbaden Fachbereich Informatik
Tel.: +49-611-9495-205 FAX +49-611-9495-210
http://www.informatik.fh-wiesbaden.de/~turau
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