[ http://issues.apache.org/jira/browse/MYFACES-856?page=all ]
Simon Kitching closed MYFACES-856:
----------------------------------
Resolution: Won't Fix
Ok, it looks like there is simply no easy answer to making t:aliasBean work
with component binding. I've therefore added information about this to the
AliasBean.java javadoc, and to the wiki. Looks like that is all that can be
done.
> t:aliasBean + binding + panelGrid causes exception
> --------------------------------------------------
>
> Key: MYFACES-856
> URL: http://issues.apache.org/jira/browse/MYFACES-856
> Project: MyFaces
> Type: Bug
> Reporter: Simon Kitching
>
> The following use of t:aliasBean causes an exception:
> ==== including page
> <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h"%>
> <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f"%>
> <%@ taglib uri="http://myfaces.apache.org/tomahawk"; prefix="t"%>
> <f:view>
> <h:panelGrid>
> <t:aliasBean alias="#{target}" value="#{someBean}">
> <jsp:include page="included.jsp"/>
> </t:aliasBean>
> </h:panelGrid>
> </f:view>
> ==== included page
> <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h"%>
> <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f"%>
> <%@ taglib uri="http://myfaces.apache.org/tomahawk"; prefix="t"%>
> <f:subview id="foo">
> <h:inputText binding="#{target.input}"/>
> </f:subview>
> The thrown exception is:
> javax.faces.el.PropertyNotFoundException: Base is null: target
> at
> org.apache.myfaces.el.ValueBindingImpl.resolveToBaseAndProperty(ValueBindingImpl.java:457)
> at
> org.apache.myfaces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:245)
> at
> org.apache.myfaces.application.ApplicationImpl.createComponent(ApplicationImpl.java:434)
> I believe the problem is that panelGrid renders its children. This means that
> the components are first created, then the panelGrid iterates over them to
> render them. However the alias bean hasn't set up the alias at the time the
> components are being created. And ApplicationImpl.createComponent(binding,
> context, componentType) is immediately evaluating the binding expression,
> resulting in the target bean for the binding not being found.
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