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List:       jakarta-commons-dev
Subject:    [jira] Created: (LOGGING-108) Classloader reference leak on Tomcat
From:       "Taras Tielkes (JIRA)" <jira () apache ! org>
Date:       2006-06-27 18:48:29
Message-ID: 29931059.1151434109867.JavaMail.jira () brutus
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Classloader reference leak on Tomcat 5.5.17 with log4j in webapp
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         Key: LOGGING-108
         URL: http://issues.apache.org/jira/browse/LOGGING-108
     Project: Commons Logging
        Type: Bug

    Versions: 1.1 Final    
 Environment: JDK 1.5.0_07, Tomcat 5.5.17
commons-logging-api-1.1.jar is configured for the Tomcat bootstrap
commons-logging-adapters-1.1.jar is deployed with a webapp
log4j-1.2.11 is deployed with webapp

This is the configuration specifically described in the release notes for 1.1:

" New jar file commons-logging-adapters-xxx.jar is now provided. This can be
  used to resolve class cast conflicts where parts of commons-logging are
  deployed via different classloaders. It is not expected to be frequently
  used; it is only necessary in situations where a container has deployed
  commons-logging-api.jar and a webapp wants to bind to a third-party
  logging implementation such as log4j. In this case, the webapp can
  experience problems if it deploys commons-logging.jar as this causes
  duplicates of the core commons-logging classes, but commons-logging-adapters
  can be safely used."
    Reporter: Taras Tielkes


Some Tomcat Jasper implementation classes are initialized (that mean static fields \
and static initializer) when the current thread has the webapp classloader set as the \
context classloader.

An example of this is org.apache.jasper.runtime.PageContextImpl

If the first JSP page rendered on a freshly started Tomcat 5.5.17 is for a webapp \
that contains the configuration described in the "Environment" section above, a leak \
will occur:

The class PageContextImpl (loader by CL above Webapp classloader in delegation chain) \
stays loaded for the duration of the JVM The "log" field in this class refers to a \
class loaded from a WebappClassloader.

This produces a classloader reference leak to the webapp, even after undeployment.






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