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