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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2905) Shutting down embedded Derby does not remove all code, the AutoloadDriver is left registered in the DriverManager.
Date Fri, 11 Feb 2011 18:58:57 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993638#comment-12993638
] 

Kathey Marsden commented on DERBY-2905:
---------------------------------------

What user functionality is broken with the DERBY_2905_part2_2.diff?   I have not seen any
failures on JDK 1.6. Is it  JDK 1.7 specific related functionality of getParentLogger when
the AutoloadedDriver is reloaded after shutdown?   Since there is no regression to previous
releases and no JDK 1.7 released. I think it would make sense to file a separate issue for
the JDK 1.7 issue and work on that separately as part of the JDBC 4.1 work.

I think in general the Autoloader code was designed with the assumption that it would never
be unloaded with all the references in DataSources and such, so it was quite tricky I think
for Lily to figure out how to get the updates in all the right places, but it does work and
is a great improvement over the current state.   Maybe the addition of AutoloadedDriver40
warrants a refactoring to remove that assumption.


> Shutting down embedded Derby does not remove all code, the AutoloadDriver is left registered
in the DriverManager.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2905
>                 URL: https://issues.apache.org/jira/browse/DERBY-2905
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.2.2.0, 10.3.1.4, 10.4.1.3
>            Reporter: Daniel John Debrunner
>            Assignee: Lily Wei
>         Attachments: DERBY-2905-2.diff, DERBY-2905_1.diff, DERBY-2905_3.diff, DERBY-2905_part2_1.diff,
DERBY-2905_part2_2.diff, DERBY-2905_part2_2_1.diff, DERBY-2905_part2_2_2.diff, DERBY-2905_part2_2_3.diff,
DERBY-2905v0.diff, DERBY-2905v0.stat, DERBY-2905v1.diff, DERBY-2905v1.stat, DERBY-2905v3.diff,
DERBY-2905v3.stat, Main.java, Mainv1.java, Repro2905.java, ww.java
>
>
> After a shutdown of the embedded driver the AutoloadDriver is not unregistered from DriverManager.
However it does not support any future loading of connections so it has no value in remaining
registered. Since the DriverManager class will remain forever, this means the Derby code will
remain forever in the JVM, even if Derby was loaded by a separate class loader.
> Regression from 10.1 since before the AutoloadedDriver the internal driver did unregister
itself from the DriverManager on a shutdown.

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