https://issues.apache.org/bugzilla/show_bug.cgi?id=49669

      Summary: Static reference from
            javax.security.auth.Policy.contextClassLoader prevents
            an undeployed Web application from being garbage
            collected
      Product: Tomcat 7
      Version: 7.0.0
      Platform: Sun
    OS/Version: Solaris
       Status: NEW
      Severity: normal
      Priority: P2
     Component: Catalina
    AssignedTo: dev@(protected)
    ReportedBy: ArjenCornelis.Knibbe@(protected)


Overview
The class javax.security.auth.Policy has a static member contextClassLoader
that can refer to the WebappClassLoader of an application. If that happens, the
web application cannot be garbage collected after undeploy.

Steps to reproduce
Create a web application that uses Axis 1 as SOAP server. Deploy the web
application in Tomcat. Make a SOAP call to the webapplication. Undeploy the web
application. Wait an hour.
Make a memory dump using jmap, and inspect the memory using jhat.

Actual results
The WebappClassLoader for the web application is still present. Its "reference
chains from rootset" shows a reference like this:
System Class Reference :
--> class javax.security.auth.Policy (84 bytes) (static field
contextClassLoader:)
--> org.apache.catalina.loader.WebappClassLoader@(protected))

Expected results
There is no WebappClassLoader for this web application anymore.

Build date & platform
Downloaded Core tar.gz from http://tomcat.apache.org/download-70.cgi

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