Component bindings are not reset when explicit navigation to the same page is
derived from action
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Key: MYFACES-2924
URL: https://issues.apache.org/jira/browse/MYFACES-2924
Project: MyFaces Core
Issue Type: Bug
Components: JSR-314
Affects Versions: 2.0.1
Reporter: Leonardo Uribe
Assignee: Leonardo Uribe
It is possible to cause a duplicate id exception doing the following steps:
- Render one page (let's call mypage.xhtml) with a component that has a binding
to a request scope managed bean
- Click the button
mypage.xhtml
....
<x:component binding="#{bean.component}/>
<f:facet name="header">
/*.... some components here with non generated id ....*/
</f:facet name="header">
</x:component>
<h:commandButton action="#{bean.someMethod}">
....
bean
public String someMethod()
{
return "mypage";
}
That example should work without problem. The problem is raised by an
optimization done in myfaces:
UIInstructionHandler
if (mctx.isRefreshingTransientBuild())
{
c = ComponentSupport.findChildByTagId(parent, id);
/*......*/
If we are not refreshing the current view, it does not have sense to try to
find a component that will not be found, right?
The spec is clear about the effect of the previous example:
JSF 2.0 section 7.4.2 : "...A rule match always causes a new view to be
created, losing the state of the old view. This includes clearing out the view
map....."
but if you have component bindings on the page, all components inside the
component with the binding will preserve the state. There is one simple
solution from the user point of view (and this is what everyone usually does in
this case):
public String someMethod()
{
return null;
}
no rule match means no navigation, the view state is preserved and finally no
duplicate id exception.
If we disable the optimization code, the code will work, but there is still one
problem with the spec.
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