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https://issues.apache.org/jira/browse/MYFACES-2564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835635#action_12835635
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Ganesh Jung commented on MYFACES-2564:
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I agree with Michael in that the faces-config version is only for schema
validation and may not be used to reject old versions.
It's the same problem as with old taglib.xml's. A facelets taglib may contain a
faces-config version 1.1 or 1.2, but must be accepted by JSF 2.0. Thus Michael
is correct in accepting them. Please check the example jar in MYFACES-2543 that
MUST work with JSF 2.0 according to the spec.
Second argument is that the reference implemetation is working correctly here -
it allows old faces-config versions.
Third argument here: JSF 1.2 did accept 1.1 faces-configs, so why should JSF
2.0 discontinue support for 1.1 or 1.2 versions? If backward compatibilty was
dropped here it would need to be explicitly stated by te spec, but I see no
reason to do this.
> facelets in an app with a 1.2 level faces-config do not work
> ------------------------------------------------------------
>
> Key: MYFACES-2564
> URL: https://issues.apache.org/jira/browse/MYFACES-2564
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.0.0-beta
> Reporter: Michael Concini
> Assignee: Michael Concini
>
> According to section 10.1.2 of the spec:
> The sole determinant to backwards compatibility lies in the answer to the
> question, "is there any Java
> code in the application, or in libraries used by the application, that
> extends from or depends on any class in package
> com.sun.facelets and/or its sub-packages?"
> ...
> If the answer to this question is "no", Facelets in JSF 2.0 is backwards
> compatible with pre-JSF 2.0 Facelets and such
> an application must not continue to bundle the Facelets jar file along with
> the application, and must not continue to set
> the Facelets configuration parameters.
> This implies that simply removing the pre-2.0 facelets bundle should allow
> the app to run properly again in a 2.0 runtime.
> The problem is that right now we're doing a check against the version in the
> faces-config in addition to checking for the context param and the
> availability of the com/sun/facelets classes. We should only be doing the
> latter, as the version in the faces-config should only be used for schema
> validation.
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