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https://issues.apache.org/jira/browse/MYFACES-2552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833029#action_12833029
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Jakob Korherr commented on MYFACES-2552:
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I just found out why this happens: #{cc.attrs} resolves to a Map
(CompositeComponentAttributesMapWrapper) and thus javax.el.MapELResolver is
used to resolve the values. Here is the important part of the implementation of
the getType() method from Tomcat:
if (base instanceof Map<?,?>) {
context.setPropertyResolved(true);
Object obj = ((Map<?,?>) base).get(property);
return (obj != null) ? obj.getClass() : null;
}
This explains the behavior. So we can only circumvent this by not using a Map,
however I don't know if we should really change this...
> TagValueExpression.getType() returns null if the property in the managed bean
> is null and the expression points to a facelets composite component attribute
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MYFACES-2552
> URL: https://issues.apache.org/jira/browse/MYFACES-2552
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.0.0-beta-2
> Reporter: Jakob Korherr
> Assignee: Jakob Korherr
>
> if you have a facelets composite component with an attribute "test" that
> points to a property in a managed bean (e.g. #{myBean.property}) which is
> currently null and you refer to that attribute in the implementation via
> #{cc.attrs.test} you can get the current value (null) or set a new value but
> you cannot get the type of the property (e.g. String[]). However if the
> property in the managed bean is non-null you can get the type.
> For example:
> <cc:interface name="mycomponent">
> <cc:attribute name="test" required="true"/>
> </cc:interface>
> <cc:implementation>
> <h:selectManyListbox value="#{cc.attrs.test}">
> <f:selectItems value="#{some select items}"/>
> </h:selectManyListbox>
> </cc:implementation>
> --> calling #{cc.attrs.test}.getType() will fail if #{cc.attrs.test} resolves
> to null, but will work if #{cc.attrs.test} resolves to some valid value.
> This currently results in a NullPointerException in
> _SharedRendererUtils.getConvertedUISelectManyValue().
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