ClassLoader memory leak with JSF

JSF application's classes are not unloaded properly when undeployed. The test case is in the attachment. Steps to reproduce:

1. mvn package
2. deploy war-leak.war
3. open http://localhost:8080/war-leak
4. undeploy war-leak.war
5. analyze a heap dump to find unloaded ModuleClassLoader of war-leak.war

References to the WAR classes are hold by java.beans.Introspector caches. It seems to be a known bug (feature?). For example Tomcat automatically invokes java.beans.Introspector.flushCaches() when WAR undeploys. There is also IntrospectorCleanupListener in Spring for the same purpose.

http://wiki.apache.org/commons/Logging/UndeployMemoryLeak
http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/web/util/IntrospectorCleanupListener.html