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https://issues.apache.org/jira/browse/DERBY-3853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694116#action_12694116
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Yun Lee commented on DERBY-3853:
--------------------------------

Knut, thanks for your comments.  I will turn back on weekend to provide new 
patch adopting your advice,:)

> Behaviour of setTypeMap() differs between embedded and client
> -------------------------------------------------------------
>
>                 Key: DERBY-3853
>                 URL: https://issues.apache.org/jira/browse/DERBY-3853
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Newcomer
>    Affects Versions: 10.5.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Yun Lee
>            Priority: Minor
>         Attachments: DERBY-3853-1.patch, DERBY-3853-1.stat
>
>
> On the embedded driver, Connection.setTypeMap() behaves like this (when the 
> connection is not closed):
>   - if the map argument is null, throw an SQLException with SQLState XJ081
>   - if the map is not null and not empty, throw an SQLException with SQLState 
> 0A000
>   - if the map is not null and empty, do nothing
> The behaviour on the client driver is this:
>   - always throw an SQLException with SQLState 0A000
> We should try to make the two drivers behave the same way when setTypeMap() 
> is called. (This would also allow us to simplify some of the tests in 
> J2EEDataSourceTest).

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