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https://issues.apache.org/jira/browse/DERBY-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008991#comment-13008991
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Knut Anders Hatlen commented on DERBY-5143:
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One unintended side effect from the copying is that the returned map is mutable
when using the JDBC 4.0 driver, whereas it's immutable with the JDBC 3.0 driver.
> Remove unnecessary copying of the map in getTypeMap()
> -----------------------------------------------------
>
> Key: DERBY-5143
> URL: https://issues.apache.org/jira/browse/DERBY-5143
> Project: Derby
> Issue Type: Improvement
> Components: JDBC
> Affects Versions: 10.8.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Priority: Minor
>
> The JDBC 4.0 Connection classes implement getTypeMap() by calling
> super.getTypeMap() and copying the resulting map. This is done to prevent an
> unchecked compiler warning that we would see if we simply returned
> super.getTypeMap() in this method. It would be cheaper and simpler to return
> super.getTypeMap() and ignore the warning.
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