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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5910) Document use of Connection.close() with try-with-resources
Date Fri, 12 Oct 2012 19:33:02 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kim Haase updated DERBY-5910:
-----------------------------

    Attachment: DERBY-5910-2.zip
                DERBY-5910-2.diff

Thanks very much, Dag -- I do appreciate the clarifications. 

I'm attaching DERBY-5910-2.diff and DERBY-5910-2.zip, which I hope make appropriate fixes
in both topics. 

Thanks for any additional feedback!
                
> Document use of Connection.close() with try-with-resources
> ----------------------------------------------------------
>
>                 Key: DERBY-5910
>                 URL: https://issues.apache.org/jira/browse/DERBY-5910
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.9.1.0
>            Reporter: Kim Haase
>            Assignee: Kim Haase
>         Attachments: DERBY-5910-2.diff, DERBY-5910-2.zip, DERBY-5910.diff, DERBY-5910.stat,
DERBY-5910.zip
>
>
> The Java SE 7 try-with-resources feature can cause problems with AutoCloseable objects
like java.sql.Connection. You must be careful when writing portable code which declares Connections
in the initializers of try-with-resources blocks, because Derby raises an exception if you
try to close a Connection with uncommitted work in-flight. 
> Changing Derby's Connection.close() to always commit in-flight work (and not raise an
exception) would create backward compatibility issues, but we do not know yet how serious
these issues would be, owing to a lack of data.
> Rather than change Derby's behavior now, we should document how Derby's Connection.close()
behaves and describe the portability issues involved in declaring Derby Connections in try-with-resources
initializers. 

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