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From "Sylvain Laurent (JIRA)" <ibatis-...@incubator.apache.org>
Subject [jira] Created: (IBATIS-540) Classloader memory leak because of ThreadLocal in ResultObjectFactoryUtil
Date Fri, 03 Oct 2008 08:16:44 GMT
Classloader memory leak because of ThreadLocal in ResultObjectFactoryUtil

                 Key: IBATIS-540
                 URL: https://issues.apache.org/jira/browse/IBATIS-540
             Project: iBatis for Java
          Issue Type: Bug
          Components: SQL Maps
    Affects Versions: 2.3.3, 2.3.4
            Reporter: Sylvain Laurent
         Attachments: ibatis patch for classloader memleak.txt

I'm using iBatis in a webapp with Spring and facing memory leaks upon redeployment oft he
I tracked the leaks to ibatis, where the class ResultObjectFactoryUtil has a static ThreadLocal

The problem is that the value bound to a Thread through this ThreadLocal is never nullified,
and since the "factorySettings" is a static variable, the ThreadLocal instance is reachable
as long as the ClassLoader of the webapp is reachable. But since the FactorySettings instance
is bound to the Thread through a strong reference (see the JDK implementation of ThreadLocal
in ThreadLocalMap$Entry), the classloader is finally never collected...

The solution is to always cleanup the ThreadLocal after usage (in SqlExecurtor)
I attach a patch for iBatis 2.3.4 to this issue

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