DO NOT REPLY [Bug 28817] New: - ClassCastException in org.apache.struts.taglib.TagUtils.java

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http://issues.apache.org/bugzilla/show_bug.cgi?id=28817

ClassCastException in org.apache.struts.taglib.TagUtils.java

           Summary: ClassCastException in
                    org.apache.struts.taglib.TagUtils.java
           Product: Struts
           Version: Nightly Build
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: Major
          Priority: Other
         Component: Utilities
        AssignedTo: dev@struts.apache.org
        ReportedBy: rickkw@yahoo.com


Hi, I verified this problem with nightlybuild version jakarta-struts-20040506.tar.gz

are.owm.widgets.search.filter_jsp threw exception
java.lang.ClassCastException
        at
org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1211)
        at org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)
        at org.apache.struts.taglib.TagUtils.message(TagUtils.java:1057)
        at
org.apache.struts.taglib.bean.WriteTag.retrieveFormatString(WriteTag.java:256)
        at org.apache.struts.taglib.bean.WriteTag.formatValue(WriteTag.java:319)
        at org.apache.struts.taglib.bean.WriteTag.doStartTag(WriteTag.java:234)


This happens in TagUtils.retrieveMessageResources()

        if (resources == null) {
            resources =
                    (MessageResources) pageContext.getAttribute(
                            bundle,
                            PageContext.REQUEST_SCOPE);
        }

When Struts tries to retrieve an INT format string (from a default bundle) to
display an Integer.  This condition may be the result of the way my JSP page is
constructed.  

Basically, I have two web application with each bundling and loading the Struts
library in its own class loader.  My JSP page in Application X gets a
RequestDispatcher from application Y and does an Include.  This may result in
the HttpServletRequest containing a MessageResources object loaded in
application X in the request scope, and passed along to application Y (due to
the Include).  Since the MessageResources class is loaded in each of the
application classloader in X and Y, the casting results in ClassCastException.

At the moment, I am stuck.  Could this be fixed by catching the
ClassCastException inside TagUtils.retrieveMessageResource()?  

        if (resources == null) {
            try {
                resources =
                    (MessageResources) pageContext.getAttribute(
                            bundle,
                            PageContext.REQUEST_SCOPE);
            } catch (ClassCastException e) {}
        }

Thanks!
--
Rick

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