[jboss-jira] [JBoss JIRA] (AS7-3732) sun.net.www.http.KeepAliveCache preventing classloader from being garbage collected

sun.net.www.http.KeepAliveCache preventing classloader from being garbage collected ----------------------------------------------------------------------------------- Key: AS7-3732 URL: https://issues.jboss.org/browse/AS7-3732 Project: Application Server 7 Issue Type: Bug Components: Web Affects Versions: 7.1.0.CR1b Environment: AS 7 running on JDK 1.6.0_30, Windows 7 Reporter: Philippe Guinot Assignee: Remy Maucherat Labels: as7, classloader, httpclient, jboss, keepalivecache, leak, urlconnection This is related to Tomcat issue 49230: https://issues.apache.org/bugzilla/show_bug.cgi?id=49230 {quote}When a servlet creates a URLConnection, internally this is done us-ing sun.net.www.http.HttpClient. To have the ability to keep connections alive and close them after a certain time they are placed inside a cache. A static reference is kept to this cache (sun.net.www.http.KeepAliveCache).{quote} This cache contains a non-final reference to a Thread which keeps a reference to the Application's ClassLoader, hence a Class Loader leak. The Tomcat patch won't work because the reference to the Thread is non-final and so a new thread maybe created during the application's lifecycle, far after the startup. I don't have any solution to this issue, I'm afraid. The only workaround I've found is to run this code during the shutdown of my application. This is very ugly though: {code} final KeepAliveCache keepAliveCache = new HttpClient() { public KeepAliveCache getKeepAliveCache() { return kac; } }.getKeepAliveCache(); final Field f = KeepAliveCache.class.getDeclaredField("keepAliveTimer"); f.setAccessible(true); f.set(keepAliveCache, null); {code}