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From "Martijn Hendriks (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1668) After RepositoryImpl instance has been created and shut down, some classes cannot be unloaded
Date Thu, 16 Jul 2009 11:34:15 GMT

    [ https://issues.apache.org/jira/browse/JCR-1668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731907#action_12731907

Martijn Hendriks commented on JCR-1668:

There's yet another background thread that gives a memory leak in environments where the jackrabbit
libraries can be dynamically updated (OSGi, webapps, ...): the revision table janitor in the
DatabaseJournal class. This thread must be stopped when the "stop" method of the journal is

W.r.t. the TransientFileFactory: can't we automate the call to shutdown? If RepositoryImpl.create
registers the just created instance at the TransientFileFactory and RepositoryImpl.doShutdown
de-registers the current instance, then TransientFileFactory can keep a reference count and
call shutDown itself when the reference count is 0.

> After RepositoryImpl instance has been created and shut down, some classes cannot be
> ---------------------------------------------------------------------------------------------
>                 Key: JCR-1668
>                 URL: https://issues.apache.org/jira/browse/JCR-1668
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core, jackrabbit-jcr-commons
>    Affects Versions: 1.4, commons 1.4.2, core 1.4.5
>         Environment: windows vista
> java version "1.6.0_06"
> Jetty 6.1.9
> Apache Tomcat 6.0.14
>            Reporter: Roman Puchkovskiy
>         Attachments: JCR-1636-reaper-thread.patch, test-undeploy-v2.zip
> I've built a simple web-application, which contains one servlet loaded at start-up. In
its init() method an instance of RepositoryImpl() is created, in its destroy() method this
instance is stopped (using shutdown()).
> From the servlet code, only classes in jackrabbit-core, JCR API and Servlet API are referenced.
> jackrabbit-core version is 1.4.5, and jackrabbit-jcr-commons version is 1.4.2. Other
jackrabbit libs are all of 1.4 version.
> Even if servlet's doGet() method never gets called, when the web-application is redeployed,
all its classes still hang in memory, which produces a memory leak.
> init() method is 
>     public void init() throws ServletException {
>         super.init();
>         try {
>             RepositoryConfig repoConfig = RepositoryConfig.create(getClass().getResourceAsStream("repository.xml"),
>             repo = RepositoryImpl.create(repoConfig);
>         } catch (Exception e) {
>             throw new ServletException(e);
>         }
>     }
> while destroy() method is
>     public void destroy() {
>         repo.shutdown();
>         super.destroy();
>     }
> Even when I applied patches from JCR-1636 and added TransientFileFactory.shutdown() call
to destroy() method, nothing has changed.
> Tested this in Jetty 6.1.9 and Tomcat 6.0.14.

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