RE: nested tags
have you tried looking at the generated .java files? At worst you might be
able to decompile the .class generated for this jsp
-Original Message-
From: luca [mailto:[EMAIL PROTECTED]
Sent: 18 November 2004 13:45
To: Tag Libraries Users List
Subject: nested tags
Hallo, I have implemented a tag lib with some cases
of nested cooperating tags.
For ex:
wall:img src=pix/cinema.gif alt=Cinema
wall:alternate_img src=pix/cinema_big.gif test=${bool} /
/wall:img
wall:img src=pix/games.gif alt=Games
wall:alternate_img src=pix/games_big.gif test=${bool} /
/wall:img
(complete example of usage: http://wurfl.sourceforge.net/java/coolmenu.php)
My big problem is that I just found out this doesn't work
on Weblogic 8.1 and, what's worse it does not produce
any significant diagnostics in the weblogic logs.
The JSP starts rendering and fails as soon as the second instance of the
img tag is encountered. Error msg (in the browser window):
{Exception in myjsp.jsp] null
On Tomcat 4 it works no problem.
Of course, I suspect that the problem could be due to different
strategies that the two appserver employ to reuse tag instances,
but I am not sure how I can fix this.
I do have some instance variables (necessary to allow the two tags too
cooperate), but I make sure they are initialized by doStartTag().
I attach the code of the two tags, if this can help...
thanks
Luca
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Re: nested tags
People, I fixed the problem. I'll post anyway the msg I was about to
send to the list right before I relalized it was a banal NullPointerException
that for some reason did not produce any diagnostics.
This may be interesting for those who have similar problems
in then future and to show how differently app servers may behave
thank you
Luca
===
Sorry to be a pain, but maybe someone has a clue about this absolute
mistery with Weblogic and nested tags. First I created a minimal JSP
with just two tags:
wall:img src=/images/wbmp/categories.wbmp alt=
wall:alternate_img src=http://server/categories.gif;
test=${capabilities.gif} /
/wall:img
wall:img src=/images/wbmp/homeaccess.wbmp alt=
wall:alternate_img src=http://server/odmpix/homeaccess.gif;
test=${capabilities.gif} /
/wall:img
then I modified the taglib code to print messages the console to know the
sequence
on which doStartTag() and release() were invoked.
In addition, I added messages along the way, such as (doStartTag() of
alternate_img):
System.out.println(still exist 10);
//one and only one attribute at the time (apart from 'test' which is
compulsory)
int c = 0;
if (!src.equals()) c++;
if (!eu_imode_icon.equals()) c++;
if (!ja_imode_icon.equals()) c++;
if (!opwv_icon.equals()) c++;
if (nopicture) c++;
System.out.println(still exist 20);
What I got in the console seems unesplicable. It's like if the tag
was garbage collected while its code is running!
img: doStartTag()
setting src on alternate_img tag:http://server/odmpix/categories.gif
alternate_img: doStartTag()
still exist 10
still exist 20
still exist 30
forund parent img [EMAIL PROTECTED]
still exist 40
still exist 50
test !src.equals() = true
about to img.Src2(http://server/odmpix/categories.gif). img=
[EMAIL PROTECTED]
alternate_img: release()
img: release()
img: doStartTag()
setting src on alternate_img tag:http://server/odmpix/homeaccess.gif
alternate_img: doStartTag()
still exist 10
alternate_img: release()
img: release()
The Alternative_img.doStartTag() code stops running in the middle
of nowhere special and I don't get any diagnostics.
Isn't that weird? what am I missing?
Thanks
Luca
luca wrote:
Hallo, I have implemented a tag lib with some cases
of nested cooperating tags.
For ex:
wall:img src=pix/cinema.gif alt=Cinema
wall:alternate_img src=pix/cinema_big.gif test=${bool} /
/wall:img
wall:img src=pix/games.gif alt=Games
wall:alternate_img src=pix/games_big.gif test=${bool} /
/wall:img
(complete example of usage: http://wurfl.sourceforge.net/java/coolmenu.php)
My big problem is that I just found out this doesn't work
on Weblogic 8.1 and, what's worse it does not produce
any significant diagnostics in the weblogic logs.
The JSP starts rendering and fails as soon as the second instance of the
img tag is encountered. Error msg (in the browser window):
{Exception in myjsp.jsp] null
On Tomcat 4 it works no problem.
Of course, I suspect that the problem could be due to different
strategies that the two appserver employ to reuse tag instances,
but I am not sure how I can fix this.
I do have some instance variables (necessary to allow the two tags too
cooperate), but I make sure they are initialized by doStartTag().
I attach the code of the two tags, if this can help...
thanks
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Re: Nested Tags Question
You can't use one tag as an attribute value for another tag...
Quoting kalyan inuganti [EMAIL PROTECTED]:
Hi,
I have some thing like -
c:choose
c:when test='${registrationForm.dobYear !=
}'
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear dayValue=c:out
value='${registrationForm.dobDay}'/
monthValue=c:out
value='${registrationForm.dobMonth}'/
yearValue=c:out
value='${registrationForm.dobYear}'/ /
/c:when
c:otherwise
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear /
/c:otherwise
/c:choose
However, the value that is being passed to the
date:complete tag for dayValue, monthValue, and
yearValue are the exact strings eg. c:out
value='${registrationForm.dobMonth}'/. If i print the
same thing out on the page it prints the value. It
looks pretty obvious to me that nesting the tags is
blocking interpretation of the inner tag. Any
suggestions please?
Thanks,
-kalyan
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
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Re: Nested Tags Question
Would it work?
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
At 08:18 24/08/2004 -0400, you wrote:
You can't use one tag as an attribute value for another tag...
Quoting kalyan inuganti [EMAIL PROTECTED]:
Hi,
I have some thing like -
c:choose
c:when test='${registrationForm.dobYear !=
}'
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear dayValue=c:out
value='${registrationForm.dobDay}'/
monthValue=c:out
value='${registrationForm.dobMonth}'/
yearValue=c:out
value='${registrationForm.dobYear}'/ /
/c:when
c:otherwise
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear /
/c:otherwise
/c:choose
However, the value that is being passed to the
date:complete tag for dayValue, monthValue, and
yearValue are the exact strings eg. c:out
value='${registrationForm.dobMonth}'/. If i print the
same thing out on the page it prints the value. It
looks pretty obvious to me that nesting the tags is
blocking interpretation of the inner tag. Any
suggestions please?
Thanks,
-kalyan
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
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To unsubscribe, e-mail: [EMAIL PROTECTED]
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Re: Nested Tags Question
Yes. In that case, aux will be a page-scoped variable whose value is the
result of trimming the string produced by the thevaluetag/ tag.
Quoting Helios Alonso [EMAIL PROTECTED]:
Would it work?
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
At 08:18 24/08/2004 -0400, you wrote:
You can't use one tag as an attribute value for another tag...
Quoting kalyan inuganti [EMAIL PROTECTED]:
Hi,
I have some thing like -
c:choose
c:when test='${registrationForm.dobYear
!=
}'
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear dayValue=c:out
value='${registrationForm.dobDay}'/
monthValue=c:out
value='${registrationForm.dobMonth}'/
yearValue=c:out
value='${registrationForm.dobYear}'/ /
/c:when
c:otherwise
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear /
/c:otherwise
/c:choose
However, the value that is being passed to the
date:complete tag for dayValue, monthValue, and
yearValue are the exact strings eg. c:out
value='${registrationForm.dobMonth}'/. If i print the
same thing out on the page it prints the value. It
looks pretty obvious to me that nesting the tags is
blocking interpretation of the inner tag. Any
suggestions please?
Thanks,
-kalyan
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
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To unsubscribe, e-mail: [EMAIL PROTECTED]
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Re: Nested Tags Question
Guys - Thanks for the response but in the below
example,
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
the othertag is literally taking the String ${aux}
instead of its value. I do have
rtexprvaluetrue/rtexprvalue for that particular
attribute set. Any thoughts?
Thanks
--- Kris Schneider [EMAIL PROTECTED] wrote:
Yes. In that case, aux will be a page-scoped
variable whose value is the
result of trimming the string produced by the
thevaluetag/ tag.
Quoting Helios Alonso [EMAIL PROTECTED]:
Would it work?
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
At 08:18 24/08/2004 -0400, you wrote:
You can't use one tag as an attribute value for
another tag...
Quoting kalyan inuganti [EMAIL PROTECTED]:
Hi,
I have some thing like -
c:choose
c:when
test='${registrationForm.dobYear
!=
}'
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear
dayValue=c:out
value='${registrationForm.dobDay}'/
monthValue=c:out
value='${registrationForm.dobMonth}'/
yearValue=c:out
value='${registrationForm.dobYear}'/ /
/c:when
c:otherwise
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear /
/c:otherwise
/c:choose
However, the value that is being passed to the
date:complete tag for dayValue, monthValue,
and
yearValue are the exact strings eg. c:out
value='${registrationForm.dobMonth}'/. If i
print the
same thing out on the page it prints the
value. It
looks pretty obvious to me that nesting the
tags is
blocking interpretation of the inner tag. Any
suggestions please?
Thanks,
-kalyan
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
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[EMAIL PROTECTED]
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Re: Nested Tags Question
For JSP 1.2 and earlier, rtexprvalue means an attribute can take an expression
of the form %= ... % as its value. It's not until JSP 2.0 that the container
provides the same level of built-in support for EL expressions. If you want to
use EL expressions for attribute values in your own tags you have to handle it
yourself and set rtexprvalue to false. See the following for an example:
http://www.onjava.com/pub/a/onjava/2002/10/30/jstl3.html
Quoting kalyan inuganti [EMAIL PROTECTED]:
Guys - Thanks for the response but in the below
example,
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
the othertag is literally taking the String ${aux}
instead of its value. I do have
rtexprvaluetrue/rtexprvalue for that particular
attribute set. Any thoughts?
Thanks
--- Kris Schneider [EMAIL PROTECTED] wrote:
Yes. In that case, aux will be a page-scoped
variable whose value is the
result of trimming the string produced by the
thevaluetag/ tag.
Quoting Helios Alonso [EMAIL PROTECTED]:
Would it work?
c:set var=auxthevaluetag//c:set
othertag attibute=${aux}/
At 08:18 24/08/2004 -0400, you wrote:
You can't use one tag as an attribute value for
another tag...
Quoting kalyan inuganti [EMAIL PROTECTED]:
Hi,
I have some thing like -
c:choose
c:when
test='${registrationForm.dobYear
!=
}'
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear
dayValue=c:out
value='${registrationForm.dobDay}'/
monthValue=c:out
value='${registrationForm.dobMonth}'/
yearValue=c:out
value='${registrationForm.dobYear}'/ /
/c:when
c:otherwise
date:complete monthName=dobMonth
dayName=dobDay yearName=dobYear /
/c:otherwise
/c:choose
However, the value that is being passed to the
date:complete tag for dayValue, monthValue,
and
yearValue are the exact strings eg. c:out
value='${registrationForm.dobMonth}'/. If i
print the
same thing out on the page it prints the
value. It
looks pretty obvious to me that nesting the
tags is
blocking interpretation of the inner tag. Any
suggestions please?
Thanks,
-kalyan
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
--
Kris Schneider mailto:[EMAIL PROTECTED]
D.O.Tech http://www.dotech.com/
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Re: Nested tags syntax
The JSTL tags have the ability to read the parameters. You need to sit down
with the Spec or a decent book on JSTL. A couple of hours now will save you
tons later.
This will get the job done:
c:set var=password value=${param.password} /
R
- Original Message -
From: Mike Steigerwald [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, July 20, 2003 10:08 AM
Subject: Nested tags syntax
Hi, all,
I'm relatively new at tag syntax, and I'm struggling to 'nest' two
attributes that must be quoted. I'm hoping this will be a simple question
for the more experienced users.
I'm trying to set a page variable to be equal to the value of a page
parameter using the c:set and req:parameter tags. I haven't been able to
figure out the correct combingation of quotes, brackets, and braces.
Essentially, this is my best guess at setting the variable 'password' to the
parameter of the same name:
c:set value= req:parameter name='password'/ var=password/
Can anyone help me find the error in the above syntax?
Many thanks in advance.
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