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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-1216) Unreferenced sessions should get garbage collected
Date Tue, 23 Sep 2008 15:37:46 GMT

     [ https://issues.apache.org/jira/browse/JCR-1216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Mueller updated JCR-1216:
--------------------------------

    Attachment: softReferencePatch.txt

This patch uses SoftReference instead of WeakReference, so leaks are detected a bit later.
This patch passes the unit tests on my machine. Still it's not very nice, as I don't know
what kind of ItemStateListener are registered in StateChangeDispatcher. Is there always a
hard reference to required listeners?

> Unreferenced sessions should get garbage collected
> --------------------------------------------------
>
>                 Key: JCR-1216
>                 URL: https://issues.apache.org/jira/browse/JCR-1216
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>         Attachments: softReferencePatch.txt, userSessionPatch.txt, weakReferencePatch.txt
>
>
> If an application opens many sessions and doesn't close them, they are never garbage
collected. After some time, the virtual machine will run out of memory. This code will run
out of memory after a few thousand logins:
> Repository rep = new TransientRepository();
> for (int i = 0; ; i++) {
>   rep.login(new SimpleCredentials("", new char[0]));
> }
> Using a finalizer to close SessionImpl doesn't work, because it seems there are references
from the (hard referenced part of the cache) to the SessionImpl objects. Maybe it is possible
to remove those references, or change them to weak references.

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