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From "Igor Sereda (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5963) Memory leak when shutting down Derby system
Date Sat, 27 Oct 2012 18:03:12 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485475#comment-13485475
] 

Igor Sereda commented on DERBY-5963:
------------------------------------

More investigation showed that this problem happens if a connection is ever shared between
more than one thread.

Attached please find a demo code. I couldn't unit-test it because some internal stuff is used.
Use a profiler to see that the database is held in memory.

As a workaround, I will have to use reflection to clean up all active threads.
                
> Memory leak when shutting down Derby system
> -------------------------------------------
>
>                 Key: DERBY-5963
>                 URL: https://issues.apache.org/jira/browse/DERBY-5963
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.5.3.0, 10.9.1.0
>         Environment: Embedded Derby
> Windows 7
> java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
> Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
>            Reporter: Igor Sereda
>         Attachments: TestDerbyLeak.java, yourkit.png
>
>
> I am using an embedded Derby on a server within OSGi environment, as a private library
in my bundle. When the bundle is deactivated, I stop Derby database (with jdbc:derby:;shutdown=true;deregister=true
URL)
> But although otherwise the database is released, an instance of ContextManager stays
in memory due to a leaked reference in a ThreadLocal variable (from ContextService, I presume).
The instance of ContextManager is a big deal, because it also holds the whole page cache in
memory (40MB), and also, via class loader, holds whole my OSGi bundle too.
> Please let me know if you need any information on reproducing this problem.
> Thanks!
> Igor

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