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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