MethodCache does not clean properly, leading to classloader leaking
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Key: AXIS-2674
URL: https://issues.apache.org/jira/browse/AXIS-2674
Project: Axis
Issue Type: Bug
Components: Basic Architecture
Affects Versions: 1.3, 1.4
Reporter: David Delbecq
Priority: Critical
In org.apache.axis.utils.cache.MethodCache, the cache is handled using
ThreadLocals. That mean each Thread calling MethodCache has it's own cache.
However, the method
public void clearCache() {
Map map = (Map) cache.get();
if (map != null) {
map.clear();
}
}
This only reset the cache of current Thread. Other Thread's cache are left
untouched. This is a problem in an environment like tomcat, where the
clearCache() will be called by one Thread at webapp undeploy while the caches
have been created for various calling Http-Thread. Those HttpThread now
contains via ThreadLocal implicit reference to content of cache, which contains
references to classes which themself contains natural reference to their
classloader. As such, unless you discard all Http Threads, it's impossible to
garbage collect content of caches and as such the webapp classloader that is
referenced by them is not garbage collected. This result in whole
webapplication not garbage collected at undeploy.
Possible solutions to clean whole cache:
1)
public void clearCache() {
cache = null;
}
2)
public void clearCache() {
cache = new ThreadLocal();
}
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