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From Musachy Barroso <>
Subject Re: ognl method lookup failure
Date Sun, 13 Dec 2009 00:51:30 GMT
I would suggest to put a breakpoint in XWorkMethodAccessor.callMethod
and see why it is not finding it.


On Sat, Dec 12, 2009 at 1:44 PM, Dale Newfield <> wrote:
> Often when I'm stumped writing a detailed "help!" message leads me to the
> bug and I never have to send it.  This time I was not so lucky, and since
> I've already wasted two days on this I was hoping someone here might have an
> idea to get me out of the weeds.
> I've got an abstract class "Comment" and a bunch of concrete subclasses
> thereof.  I've got a "displayComment.tag" file that calls itself recursively
> to display a tree of comments.  Among other things this checks the extant
> subscriptions on the comment in question and displays various
> subscribe/unsubscribe buttons as appropriate.
> Mostly this works.  There are a couple concrete subclasses of Comment that
> break in a bizarre way, and I've been stuck on this for two days, so I'm
> hoping someone here might have a suggestion.
> I go through the normal annoying dance to push ognl accessible objects into
> jstl-el accessible locations, passing those as attributes into the .tag file
> and then set them inside the tag into a namespace accessible from ognl:
>  (yes, I tried with #attr, too--same behavior)
> inside the .tag:
> <%@ attribute name="currentUser" required="true" type="mumble.model.User"
> rtexprvalue="true"%>
> <%@ attribute name="commentToDisplay" required="true"
> type="mumble.model.Comment" rtexprvalue="true"%>
> <c:set var="currentUserInTag" scope="request" value="${currentUser}"/>
> <c:set var="commentInTag" scope="request" value="${commentToDisplay}"/>
> Simple tests:  <s:property value="%{#request.currentUserInTag.class}"/> and
> <s:property value="%{#request.commentInTag.class}"/> show the appropriate
> (concrete) classes.
> Whereas in most instances this OGNL logic works:
> #request.commentInTag.isUserSubscribedViaEmail(#request.currentUserInTag)
> for these two specific concrete classes (due I believe to
> struts.ognl.logMissingProperties=true) it results in a log entry:
> Could not find method
> [#request.commentInTag.isUserSubscribedViaEmail(#request.currentUserInTag)]
> I am able to interrogate the object and find the expected methods:
> <s:property value="%{#request.commentInTag.class.methods.{?
>'isUserSubscribedViaEmail'}[0]}"/> results in "public boolean
> mumble.model.CommunityFunItem.isUserSubscribedViaEmail(mumble.model.User)
> but I'm also unable to get further with that: <s:property
> value="%{#request.commentInTag.class.methods.{?
> results in the log entry:  Could not find method
> [#request.commentInTag.class.methods.{?
> Maybe related: if I try to access the Class method "Method getMethod(String
> name, Class... parameterTypes)" directly to get the right one (instead of
> getting all of them and looking for one with the right name) I end up with
> this log message:
> Caught an exception while evaluating expression
> '#request.commentInTag.class.getMethod('isUserSubscribedViaEmail',#request.currentUserInTag.class)'
> against value stack
> java.lang.IllegalArgumentException: java.lang.ClassCastException@ab1dea
>        at sun.reflect.GeneratedMethodAccessor1387.invoke(Unknown Source)
>        at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(
>        at java.lang.reflect.Method.invoke(
>        at ognl.OgnlRuntime.invokeMethod(
> Again, this works with some concrete subclasses of Comment, but not others.
>  There are no substantial differences between them as far as I can tell.
>  Any ideas/leads/suggestions/suppositions welcome.
> I'm using struts, ognl 2.7.3, yes I have javassist-3.8.1.jar in
> WEB-INF/lib.  Running under glassfish if that matters.
> -Dale
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