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https://issues.apache.org/cayenne/browse/CAY-907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882#action_12882
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Kevin Menard commented on CAY-907:
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Upon further consideration, I think I agree with Andrus.  We could do the 
validation on local datasources, but it would be of questionable value since 
the exception message is already fairly clear.  We could wrap the exception to 
make it more user friendly if need be.  For non-datasources, the user may 
simply not care if they can connect to the DB from the modeler.

There's obviously a lot of value for those that need to connect, but I'd 
advocate just using a local datasource in that case.

> CM Usability: Adapters without driver should be in red
> ------------------------------------------------------
>
>                 Key: CAY-907
>                 URL: https://issues.apache.org/cayenne/browse/CAY-907
>             Project: Cayenne
>          Issue Type: New Feature
>          Components: CayenneModeler GUI
>            Reporter: Thomas Bernhard
>            Assignee: Kevin Menard
>
> Please mark with a different color: e.g. red (or just waved red underline 
> like in IDEs) the Adapters (and maybe connections too) that have no driver in 
> the classpath. This should be all over in CM.
> This is a usability issue and such a feature is present in professional DB 
> tools - it saves allot of time when working with differnt DBs (and especially 
> with different DB versions).

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