Created attachment 24819 [details] Zipped Maven project folder After undeploying web application (see attachment) instance of CustomFormatter is left non-reclaimed. As CustomFormatter is loaded by WebAppClassLoader, the classloader remains in memory too. To reproduce: deploy attached web application and stop/start it several times, then do a heap dump. Check the dump using Eclipse Memory Analyzer or YourKit Java Profiler and notice multiple WebAppClassLoaders present in the dump. Issue seems to be related to org.apache.juli.ClassLoaderLogManager. org.apache.juli.ClassLoaderLogManager$LogNode keeps a reference to java.util.logging.Logger. Logger has a handler with CustomFormatter.
Thanks for the test case. This bug has the same root cause as bug 48421 so I am marking it as a duplicate. *** This bug has been marked as a duplicate of bug 48421 ***