ThreadLocal object is never removed in ThreadEventNotifierImpl and holds the
classloader
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Key: HIVEMIND-161
URL: http://issues.apache.org/jira/browse/HIVEMIND-161
Project: HiveMind
Type: Bug
Components: framework
Versions: 1.1
Environment: Tomcat 5.5.12, J2SE 1.6 Mustang build 62, Win XP SP2
Reporter: Kyrill Alyoshin
Priority: Critical
The following prevents the web application classloader from being garbage
collected on hot redeploys of web applications.
Please note that the issue is present on J2SE 1.5 as well. I use 1.6 only
because it has far better support for JVMTI and as such the issue was easy to
discover with YourKit profiler. Here it is:
1. org.apache.hivemind.service.impl.ThreadEventNotifierImpl puts
EventListenerList ("list" variable) on its private ThreadLocal "_storage"
variable in addThreadCleanupListener method.
2. No where in that class does the actual list gets removed from ThreadLocal.
Thus, the WebappClassLoader cannot be garbage collected because one of the
object that it loaded (i.e. EventListenerList) is strongly referenced by live
threads in the container, which leads to huge memory leaks on hot-redeploys.
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