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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 39975] New: - Classloader refence leaks in jasper-runtime when webapp has log4j and commons-logging
Date Thu, 06 Jul 2006 08:44:20 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=39975

           Summary: Classloader refence leaks in jasper-runtime when webapp
                    has log4j and commons-logging
           Product: Tomcat 5
           Version: 5.0.17
          Platform: All
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: taras.tielkes@gmail.com


When the first JSP renderd (since startup) is from a webapp that contains
commons-logging and log4j, classes from the 'jasper.runtime' package create a
memory leak.

Here's a description in more detail
1) User deploys war with commons-logging + log4j jars (quite common)
2) First page is rendered, causing loading and initialization of classes in the
'jasper.runtime' package.
3) Some of these classes (for instance PageContextImpl) contain static
commons-logging 'log' fields.
4) In the scenario described, these fields get intialized to a Log4JLogger
instance that is loaded from the webapp classloader.

The effective result is that code and data in this webapp will never be unloaded.

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