infoglue taglib and evaluation

Hi,

I don't know if I'm using the taglib the way it should but i've got  
some issues with some of them
My webapp is a version 2.4 webapp, defined in web.xml :
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance 
" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd 
"
	version="2.4">

i want to use a common:size taglib, i just follow documentation  
example :
	<structure:childPages
		id="level1ChildPages"
		siteNodeId="${home.siteNodeId}"
		hideUnauthorizedPages="true"
	/>
	<common:size id="size" list="${level1ChildPages}" />

Here is the stacktrace :
  [31 août 2009 16:03:59 - Infoglue Deliver Working] ERROR  
(ApplicationDispatcher.java:711) - "Servlet.service()" pour la servlet  
jsp a lancé une exception
javax.servlet.jsp.JspException: An error occurred while evaluating  
custom action attribute "list" with value "level1ChildPages": Attempt  
to convert String "level1ChildPages" to type "java.util.Collection",  
but there is no PropertyEditor for that type (null)
	at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate 
(Evaluator.java:109)
	at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate 
(Evaluator.java:129)
	at  
org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate 
(ExpressionEvaluatorManager.java:75)
	at org.apache.taglibs.standard.tag.el.core.ExpressionUtil.evalNotNull 
(ExpressionUtil.java:48)
	at org.infoglue.deliver.taglib.AbstractTag.evaluate(AbstractTag.java: 
137)
	at org.infoglue.deliver.taglib.AbstractTag.evaluateCollection 
(AbstractTag.java:179)
	at org.infoglue.deliver.taglib.common.SizeTag.setList(SizeTag.java:84)
	at  
org.apache.jsp.jsp.Template_005fnavigation_005f_002d1288041021_jsp 
._jspx_meth_common_005fsize_005f0 
(Template_005fnavigation_005f_002d1288041021_jsp.java:302)
	at  
org.apache.jsp.jsp.Template_005fnavigation_005f_002d1288041021_jsp 
._jspx_meth_c_005fif_005f0 
(Template_005fnavigation_005f_002d1288041021_jsp.java:263)
	at  
org.apache.jsp.jsp.Template_005fnavigation_005f_002d1288041021_jsp 
._jspService(Template_005fnavigation_005f_002d1288041021_jsp.java:195)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.jasper.servlet.JspServletWrapper.service 
(JspServletWrapper.java:331)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile 
(JspServlet.java:329)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)

When we look the taglib code we have call to evaluateCollection and  
evaluate which both use ExpressionUtil
Problem is, when i write list="${level1ChildPages}" ,  $ 
{level1ChildPages} is already evaluate and can't be given to the  
taglib setter method.
Is there a way to do it a different way ?

Is the evaluation still necessary ?

Here is the code for the equivalent of common:size :
@SuppressWarnings("unchecked")
public class SizeTag extends AbstractTag {
	/** SerialID */
	private static final long serialVersionUID = 3320090703295471100L;
	private Collection collection;
	private Map map;

	public int doEndTag() throws JspException {
		if (map != null) {
			setResultAttribute(new Integer(map == null ? 0 : map.size()));
		} else if (collection != null) {
			setResultAttribute(new Integer(collection == null ? 0 :  
collection.size()));
		} else {
			throw new JspException("You must set either map or collection  
attribute on kpark:size tag");
		}
		return EVAL_PAGE;
	}

	public void setCollection(final Collection collection) {
		this.collection = collection;
	}

	public void setMap(final Map map) {
		this.map = map;
	}
}

If the evaluation is not necessary anymore, maybe we could create a  
new version of Infoglue taglib : same taglib collection but with a  
different taglib key and without the evaluation. So that, both taglib  
would be available ...



__
Romain
http://blog.astik.info


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