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Posted to taglibs-dev@jakarta.apache.org by bu...@apache.org on 2004/05/20 19:36:18 UTC
DO NOT REPLY [Bug 29109] -
empty operator doesn't work with java.util.Set instances
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http://issues.apache.org/bugzilla/show_bug.cgi?id=29109
empty operator doesn't work with java.util.Set instances
justyna.horwat@sun.com changed:
What |Removed |Added
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Status|NEW |RESOLVED
Resolution| |INVALID
------- Additional Comments From justyna.horwat@sun.com 2004-05-20 17:36 -------
Submitted by Michael Santos:
----
Regarding this bug:
That's the expected behaviour in JSTL 1.0, according to the spec.
I don't have a bugzilla user and I am not a committer, so, I am unable to
help this user more.
Reference:
http://weblogs.java.net/pub/wlg/730
Regards,
Michael Nascimento Santos
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In your bug report, you didn't specify which version of JSTL you are using.
If you are using JSTL 1.0 then this is the expected behavior. If you look at section A.3.8 of the JSTL 1.0
specification you will find the empty operator defined as follows:
empty A is evaluated as follows:
■ If A is null, return true,
■ Otherwise, if A is the empty string, then return true.
■ Otherwise, if A isan empty array, then return true.
■ Otherwise, if A is an empty Map, return true
■ Otherwise, if A is an empty List, return true,
■ Otherwise return false.
With JSTL 1.1 the EL was moved to the JSP 2.0 specification domain. With JSTL 1.1 it is now up to the
domain of the JSP container to support the JSP 2.0 EL implementation.
In JSP 2.0 the empty operator behavior has changed slightly. In JSP 2.0 section JSP.2.3.7, the empty
operator behaves as follows:
• If A is null, return true,
• Otherwise, if A is the empty string, then return true.
• Otherwise, if A is an empty array, then return true.
• Otherwise, if A is an empty Map, return true,
• Otherwise, if A is an empty Collection, return true,
• Otherwise return false.
Moving to JSTL 1.1 and a JSP 2.0 container will address your problem.
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