[jbossseam-issues] [JBoss JIRA] Updated: (JBSEAM-1253) jboss-el resolver chain breaks on HashMap$Value

Pete Muir (JIRA) jira-events at lists.jboss.org
Thu Apr 26 09:54:30 EDT 2007

     [ http://jira.jboss.com/jira/browse/JBSEAM-1253?page=all ]

Pete Muir updated JBSEAM-1253:

    Fix Version/s: 1.3.0.BETA1
         Assignee: Pete Muir

> jboss-el resolver chain breaks on HashMap$Value
> -----------------------------------------------
>                 Key: JBSEAM-1253
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1253
>             Project: JBoss Seam
>          Issue Type: Bug
>          Components: JSF
>    Affects Versions: 1.2.1.GA
>         Environment: Seam from CVS, JBoss 4.2.0CR2, Facelets
>            Reporter: Stuart Robertson
>         Assigned To: Pete Muir
>             Fix For: 1.3.0.BETA1
> HashMap$Value extends AbstractCollection, so I expected the following to work.  I'm creating a unordered list from the values in a Map.  Here's the xhtml:
> <ui:repeat var="descriptor" value="#{catalogMapping.rawApplicableDescriptors.conditionalRequired}">
> 	<h:outputText value="#{descriptor.description}"/>
> </ui:repeat>
> Here's the relevant bits in "rawApplicableDescriptors":
>     private final Map<String, CatalogItemDescriptor> conditionalRequired = new HashMap<String, CatalogItemDescriptor>();
>     public Collection<CatalogItemDescriptor> getConditionalRequired()
>     {
>         return conditionalRequired.values();
>     }
> But here's what I see:
> Caused by: javax.el.PropertyNotFoundException: /members/catalog/mapping/applicable-fields.xhtml @20,54 value="#{descriptor.description}": Property 'description' not found on type java.util.HashMap$Values
> 	at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:73)
> 	at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
> Tracing through in the debugger, all of the resolvers in the chain are called in sequence, and none of them can resolve the value.  It appears the one that is throwing (Wish I knew why Eclipse isn't showing the inner stacktrace) is BeanElResolver, from jboss-el.  Looks like NullPointer at:
> 	public Object getValue(ELContext context, Object base, Object property)
> 			throws NullPointerException, PropertyNotFoundException, ELException {
> 		if (context == null) {
> 			throw new NullPointerException();
> 		}
> Hmm.  Wait.  Duh.  The problem is't down here.  It's in the el's handling of 
> value="#{catalogMapping.rawApplicableDescriptors.conditionalRequired}".
> ui:repeat should be iterating over the contents of the collection.  Meaning #{descriptor...} should be an instance of the contained type.  Instead 	<h:outputText value="#{descriptor.description}"/> is trying to resolve "description" as a property of the _collection itself_.  
> I'm having trouble giving more detail on this one.  It should be very easy to reproduce.  Please let me know if there's anything I can do to help investigate.
> Oh, and this works fine if I iterate over a list rather than a collection of type HashMap$Value

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