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https://issues.apache.org/jira/browse/JCR-1668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610586#action_12610586
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Marcel Reutegger commented on JCR-1668:
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The following worked for me:
- Deploy jackrabbit-webapp-1.5-SNAPSHOT into tomcat
- Stop tomcat
- *Move* derby-10.2.1.6.jar from WEB-INF/lib to commons/lib
- Redeploying the webapp several times will eventually unload obsolete classes
It seems there is a background thread in derby that prevents unloading of
classes (AntiGC), unless you shutdown derby completely.
See: http://db.apache.org/derby/docs/10.4/devguide/tdevdvlp20349.html
> After RepositoryImpl instance has been created and shut down, some classes
> cannot be unloaded
> ---------------------------------------------------------------------------------------------
>
> Key: JCR-1668
> URL: https://issues.apache.org/jira/browse/JCR-1668
> Project: Jackrabbit
> 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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