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https://issues.apache.org/jira/browse/DERBY-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12690121#action_12690121
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Rick Hillegas commented on DERBY-4126:
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Ported 759360 from main to 10.5 branch at subversion revision 759363.
> You can't invoke a table function which is stored in a jar file inside the
> database
> -----------------------------------------------------------------------------------
>
> Key: DERBY-4126
> URL: https://issues.apache.org/jira/browse/DERBY-4126
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.6.0.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-4126-01-aa-useSessionClassloader.diff,
> derby-4126-01-ab-useSessionClassloader.diff
>
>
> You get a ClassNotFoundException when you try to invoke a table function
> which lives in a jar file stored inside the database. This is because
> FromVTI.implementsDerbyStyleVTICosting() looks up the class using
> Class.forName() rather than using the session classloader. A similar bug is
> in FromVTI.getVTICosting(). This bug was reported by Krzysztof N in the
> following user list thread:
> http://www.nabble.com/Uinable-to-use-Table-function-due-to-java.lang.ClassNotFoundException--while-class-is-clearly-reachable..-td22478383.html#a22699492
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