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https://issues.apache.org/jira/browse/MYFACES-2552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113805#comment-13113805
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Matt Benson commented on MYFACES-2552:
--------------------------------------
This latest patch only begins to address the idea of providing a context
parameter with which this behavior may be disabled for MyFaces < v2.2.x . We
should probably hammer that out on dev@myfaces. I am still looking into
reworking my tests into MyFaces' test structure.
> 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: 2.1.0
> Reporter: Jakob Korherr
> Assignee: Jakob Korherr
> Attachments: MYFACES-2552-spec-proposal.patch, spec745mf.patch.txt
>
>
> 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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