Bug 41869 - Should EL (Expression Language) expressions result in the TagData.REQUEST_TIME_VALUE object?
Summary: Should EL (Expression Language) expressions result in the TagData.REQUEST_TIM...
Alias: None
Product: Tomcat 5
Classification: Unclassified
Component: Unknown (show other bugs)
Version: 5.5.20
Hardware: PC Windows XP
: P2 normal with 1 vote (vote)
Target Milestone: ---
Assignee: Tomcat Developers Mailing List
Depends on:
Reported: 2007-03-16 12:43 UTC by David L. Diehl
Modified: 2007-04-17 17:32 UTC (History)
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Description David L. Diehl 2007-03-16 12:43:38 UTC
I have a custom tag with attributes defined in the TLD file as allowing run-
time expression values, meaning:


I also have a TagExtraInfo class that I am using to validate the values 

Inside my TagExtraInfo sub-class I have code such as this:

   Object attr = data.getAttribute("groupSize");
   if ( attr != null &&
and so on.   When, in my JSP, I provide attribute values such as "<%= 10 * 14 
%" (JSP scriplet) I do indeed get the TagData.REQUEST_TIME_VALUE object back 
on this call.

However, when I instead have an EL value, something like "${groupSizeValue}", 
I do not received the REQUEST_TIME_VALUE distinguished object back.  I receive 
a String object, containing the text "${groupSizeValue}".  Is this the correct 
behavior?  Everything I have read (books, Google searches, etc.) seems to 
point me in the thinking that this is a bug.

From looking at the tomcat 5.5.20 and 5.5.23 source code, I see where the 
JspAttribute (nested class of Node) is created.  In the Validator class, line 
1117, is the creation for this object passing the constant "false" for 
the "expr" argument (5th argument to the 1st ctor of this class).  I believe 
it is line 1117 that would be getting executed since the if statement 
preceding this is:

   if (el.containsEL() && !pageInfo.isELIgnored()) {
So, my question is, why would an EL expression when EL is not being ignored be 
considered not an expression?
Comment 1 Mark Thomas 2007-04-17 17:32:32 UTC
This is indeed a bug. JSP. of the JSP spec is the definitive reference.

I have applied the fix to svn and it will be included in 5.5.24 and 6.0.12

Thanks for the report.