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https://issues.apache.org/jira/browse/MYFACES-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344625#comment-15344625
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Bill Lucy commented on MYFACES-4050:
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Thanks for testing this [~lu4242]
> Validators not invoked for empty selectManyCheckbox components
> --------------------------------------------------------------
>
> Key: MYFACES-4050
> URL: https://issues.apache.org/jira/browse/MYFACES-4050
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.2.10
> Environment: Tomcat, WebSphere Liberty
> Reporter: Bill Lucy
> Fix For: 2.0.25, 2.1.19, 2.2.11
>
> Attachments: MYFACES-4050.patch, MYFACES-4050.patch
>
>
> Custom validators are not invoked for selectManyCheckbox component, if the
> component has no selections made; this can be an issue if we want to handle
> the null/empty case in a validator. The following context params address
> this case:
> <context-param>
>
> <param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
> <param-value>true</param-value>
> </context-param>
>
> <context-param>
> <param-name>javax.faces.VALIDATE_EMPTY_FIELDS</param-name>
> <param-value>true</param-value>
> </context-param>
> But these params do not affect the behavior here. Based on my understanding
> of the spec, it seems that this behavior should be changed.
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