https://issues.apache.org/bugzilla/show_bug.cgi?id=56472
Bug ID: 56472
Summary: All classes remain in memory after stop of web
application, when LDAP was used.
Product: Tomcat 7
Version: 7.0.52
Hardware: All
OS: All
Status: NEW
Severity: minor
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Created attachment 31573
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31573&action=edit
Classes that hold a reference to WebappClassLoader
I have a problem with unloading casses of a web application when I stop it.
All threads are closed, but all 6.000 classes remain in memory. The GC cannot
destroy WebappClassLoader because it is held by a static hashMap of the naming
services which is hold by the VM.
See attached image.
The problem occurs only when the application uses the naming service. I
identified the first method in my application that triggers the problem:
public class MyBindAuthenticator extends BindAuthenticator {
...
@Override
public DirContextOperations authenticate(Authentication authentication) {
...
List<String> userns=getUserDns(username);
...
}
...
}
When I replace this line by a hardcoded list of strings, then the problem gets
triggered by the next call of any naming service method. When I replace the
whole authenticate() method by an empty one, then the problem disappears. But I
need it for security reason.
Unfortunately, the problematic hashmap (with name securityTokens) is not
accessible to me, so I cannot remove the references. I seems that all related
classes are part of Catalina and not reachable from outside.
I would appreciate a workaround, if not bugfix is available.
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