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In Tomcat 7.0.x, there is a new functionality for clearing the classloader references when a web application is stopping. This is added for memory leak prevention. We have to think about extending the current BundleWebappClassLoader.clearReferences() if the corresponding cases are applicable when running in OSGi environment.
With this enhancement we should be able to address also the following issue: http://plumbr.eu/blog/12-year-old-bug-in-jdk-still-out-there-leaking-memory