Ceki,
I think I've found a workaround for this problem.
Debugging the log4j property configuration code when executing test case 3, I noticed it used the java.beans package in PropertySetter to set the ConversionPattern property of the appender layout object. This code doesn't get executed in the other testcases because no Layout parameters (including ConversionPattern) are specified (at least not specified via the configuration file).
After googling a bit on "Inspector", "memory", "leak" I found a few clues that led to the inspection of the java.beans.Introspector class. This class includes the following comment in its javadoc:
* Because the Introspector caches BeanInfo classes for better performance, * take care if you use it in an application that uses * multiple class loaders. * In general, when you destroy a <code>ClassLoader</code> * that has been used to introspect classes, * you should use the * [EMAIL PROTECTED] #flushCaches <code>Introspector.flushCaches</code>} * or * [EMAIL PROTECTED] #flushFromCaches <code>Introspector.flushFromCaches</code>} method * to flush all of the introspected classes out of the cache.
I then added a call to Introspector.flushCaches() in SimpleServlet.destroy() after the call to LogManager.shutdown(). With this additional line of code, test case 3 is now successful - the web app classes and the tomcat web app class loader are now garbage collected.
Does this seem like a reasonable explanation/solution? This doesn't appear to be a log4j issue (I hope I didn't cause anyone any extra work). I would guess that maybe Tomcat should call Introspector.flushCaches() when it shuts down a web app since it's throwing away the classloader for the web app. For now, I'll include this line of code during web app shutdown.
This makes perfect sense. Due to the presence of the ConversionPattern property, Test 3 is the only time PropertyConfigurator will use introspection, hence the failure in garbage collection of the web-app.
Good call!
Hope this helps,
It sure does.
-Jay
-- Ceki G�lc�
For log4j documentation consider "The complete log4j manual"
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