DO NOT REPLY [Bug 37010] New: - SetSupport.doEndTag overzealous about cleanup

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http://issues.apache.org/bugzilla/show_bug.cgi?id=37010

           Summary: SetSupport.doEndTag overzealous about cleanup
           Product: Taglibs
           Version: 1.1.0
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Standard Taglib
        AssignedTo: taglibs-dev@jakarta.apache.org
        ReportedBy: Joe@Germuska.com


I'm not deeply familiar with the Standard taglibs code, but I have a
reproducible problem.  I had this tag in my code:

<c:set var="VENDOR" value="${sessionScope.BROWSE_VENDOR}" />

and it was causing the "VENDOR" attribute to be cleared from the session.  The
naming is evolving, so that for now those two attribute names are intended to
mean different things.  I was puzzled about what was going on, but when I put in
a SessionAttributeListener, I was able to determine that the behavior was
instigated by:

org.apache.jasper.runtime.PageContextImpl.removeAttribute(PageContextImpl.java:574)
org.apache.taglibs.standard.tag.common.core.SetSupport.doEndTag(SetSupport.java:118)
org.apache.jsp.catalog.Navigation_jsp._jspx_meth_c_set_1(Navigation_jsp.java:175)

if I explicitly set VENDOR into page scope, then the session doesn't get
touched.  Or, if I use a different local name instead of VENDOR, the session
doesn't get touched.  I haven't quite figured out how this is working in the
code, but these changes to the JSP seem to effectively control the behavior.  

(this is actually using standard-1.1.2.jar, but that version isn't in the
versions...)

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