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https://issues.apache.org/jira/browse/TRINIDAD-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983533#action_12983533
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Jeanne Waldman commented on TRINIDAD-1767:
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Sorry. We decided not to throw an exception since that is too harsh. Instead it 
is best to add a warning, and do a no-op. This is nicer than throwing
an exception. And our code assumes the skin does not change. Wacky things might 
happen if they change a skin with the same id.

> throw an IllegalStateException on SkinFactory.addSkin for duplicate skins.
> --------------------------------------------------------------------------
>
>                 Key: TRINIDAD-1767
>                 URL: https://issues.apache.org/jira/browse/TRINIDAD-1767
>             Project: MyFaces Trinidad
>          Issue Type: Improvement
>          Components: Skinning
>    Affects Versions: 1.2.13-core 
>            Reporter: Jeanne Waldman
>         Attachments: 1767_1.2.x.patch, 1767_2.0.x.patch
>
>
> hrow an IllegalStateException from Trinidad's SkinFactory.addSkin() method
> if a skin id that already exists is added again. This will not change the
> method signature since IllegalStateException is an unchecked exception.
> This will keep a duplicate skin from overriding an existing one.

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