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http://www.stripesframework.org/jira/browse/STS-514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=11256#action_11256
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Frederic Daoud commented on STS-514:
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I've investigated this. The problem is that the useActionBean tag has
UseActionBeanTagExtraInfo, which tries to tell the container the class of the
action bean. If you assign beanclass to a String, such as
beanclass="com.myco.MyActionBean", this works fine. But if you assign it to an
rtexprvalue, whether it is a dynamic String as in the example above, or a Class
object such as "${actionBean.class}" or "<%= someClassInstance %>", the
UseActionBeanTagExtraInfo cannot determine the class of the Action Bean.
Indeed, TagExtraInfo is given a TagData object, and the Javadocs clearly state
that translation-time information only is available - request-time expressions
are not yet available at this point.
The end result is that for rtexprvalues, UseActionBeanTagExtraInfo will either:
1) get a String such as "a.b.c.${beanclass}" (unresolved), and pass that on as
the class name, causing an error
2) get the javax.servlet.jsp.tagext.TagData.REQUEST_TIME_VALUE Object. This
object cannot be cast as a String, and causes the error shown above.
I'm not sure what's next. It'd be nice for the beanclass attribtue of
<s:useActionBean> to work just like the beanclass attribute of all the other
Stripes tags. I don't know the consequences of changing/removing
UseActionBeanTagExtraInfo. People who know more in this area, please speak up
:-)
> Problems with 'beanclass'
> --------------------------
>
> Key: STS-514
> URL: http://www.stripesframework.org/jira/browse/STS-514
> Project: Stripes
> Issue Type: Bug
> Components: Tag Library
> Affects Versions: Release 1.5.1
> Environment: XP, Tomcat 5.5
> Reporter: Phil Sladen
>
> a) Assignment to 'var' appears to be missing in
> UseActionBeanTagExtraInfo.getVariableInfo().
> b) When tag called as:
> <s:useActionBean beanclass="a.b.c.${beanclass}" var="actionBean"/>
> get:
> java.lang.ClassCastException: java.lang.Object cannot be cast to
> java.lang.String
> at
> net.sourceforge.stripes.tag.UseActionBeanTagExtraInfo.getVariableInfo(UseActionBeanTagExtraInfo.java:53)
> at
> org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:715)
> at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1442)
> at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
> Thanks.
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