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https://issues.apache.org/jira/browse/TRINIDAD-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853344#action_12853344
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Ali Ok commented on TRINIDAD-1767:
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Javadoc of SkinFactory.addSkin method:
"Register the specified Skin instance, associated with the specified skinId, to 
be supported by this SkinFactory, replacing any previously registered Skin for 
this identifier."

Behavior of adding a skin with existing skinId is clearly replacing the older 
skin.

I prepared the patch to throw exception for duplicate skin ids, but I wanted to 
ask you: are we clear on this issue?

> 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
>
> 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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