[GLASSFISH-581] No pageContext implicit object in deferred expressions, and
no request object in immediate expressions Created: 17/Apr/06 Updated: 17/Apr/06 Resolved: 17/Apr/06
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Component/s:
Affects
Version/s:
Fix Version/s:
Resolved
glassfish
web_container
9.0pe
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Remaining
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Original
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Environment:
Bug
tony_robertson
Incomplete
None
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Attachments:
checkImplicitJSF.jsp
581
Issuezilla Id:
9.0pe
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Votes:
Major
jluehe
0
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Not Specified
Operating System: All
Platform: All
Description
Within a JSF page, the implicit objects available to $
{...} expressions and #{...}
expressions seems to be different. In particular the following
expressions give the following results:
Expression Value
$
{request} (not defined)
${pageContext} org.apache.jasper.runtime.PageContextImpl@5f8113
${pageContext.request}
com.sun.faces.context.MyHttpServletRequestWrapper@19c38e3
#{request}
com.sun.faces.context.MyHttpServletRequestWrapper@19c38e3
#
{pageContext}
(not defined)
#
{pageContext.request}
(not defined)
My understanding of the JSP2.1 specification is that all the above expressions
should yeild valid objects (and that 'request' is effectively an alias
for 'pageContext.request'). The JSP2.0 spec only has 'pageContext' as a top
level object, but not 'request'. So it seems that when evaluating '$
{...}'
expressions, the JSP2.0 spec is being followed, but when evaluating '#{...}
'
expressions, the JSP2.1 is basically being followed, but 'pageContext' is not
defined.
A test JSP page is attached.
[BTW, not certain about the glassfish version number, but it is the one from
the distribution named "glassfish-installer-9.0-b42.zip" and the admin console
version reports "Sun Java System Application Server Platform Edition 9.0 RC
(build b42)"]
Comments
Comment by tony_robertson [ 17/Apr/06 ]
Created an attachment (id=218)
Test JSF page to print the value of some implicit object expressions
Comment by jluehe [ 17/Apr/06 ]
Notice that the Unified EL in JSP 2.1 allows different technologies to define
and plug in their own ELResolvers for implicit objects:
The ImplicitObjectELResolver for JSF (invoked by the JSF tags in your sample
page) has no knowledge of any "pageContext" implicit object, whereas the
ImplicitObjectELResolver for JSPs knows nothing about any "request" implicit
object (it only knows about the implicit "pageContext.request").
Comment by tony_robertson [ 17/Apr/06 ]
OK, yes that makes sense. #{} and ${} expressions on custom tags do give the
same results.
I should read the spec more carefully!
Thanks.
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