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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