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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33931] New: - WeakHashMap incorrectly used in ContextClassLoaderLocal - may cause memory leak
Date Wed, 09 Mar 2005 15:47:06 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33931

           Summary: WeakHashMap incorrectly used in ContextClassLoaderLocal
                    - may cause memory leak
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bean Utilities
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: c.grigoroscuta@moodmedia.ro


Signaled in version 1.7 of beanutils: the class ContextClassLoaderLocal
incorrectly uses a WeakHashMap (valueByClassLoader) - used by BeanUtilsBean.
In order for a WeakHashMap to work correctly, the values must not hold
references to keys, otherwise it behaves like a normal map. 
But in ContextClassLoaderLocal, the key is the context class loader of the
current thread, while the value is any object (for example a BeansUtilsBean,
when used by BeanUtilsBean). If the value class is loaded by the context class
loader, it violates the above mentioned rule, and this may cause severe memory
leaks when used in web applications that are stopped/started multiple times, by
holding strong references to class loaders that would otherwise be garbage
collected.

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