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From "Niall Pemberton (JIRA)" <j...@apache.org>
Subject [jira] Updated: (BEANUTILS-156) [beanutils] Memory leak on webapp undeploy in MappedPropertyDescriptor
Date Sun, 20 May 2007 12:16:16 GMT

     [ https://issues.apache.org/jira/browse/BEANUTILS-156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Niall Pemberton updated BEANUTILS-156:
--------------------------------------

    Fix Version/s:     (was: LATER THAN 1.8.0)
                   1.8.0
         Assignee: Niall Pemberton

The declaredMethodCache was removed from MappedPropertyDescriptor for issue# BEANUTILS-6 (on
1st Sept 2005) - see revision 265760[1]. BeanUtils already contained equivalent functionality
in the getMatchingAccessibleMethod() method in MethodUtils - so this was used to replace the
functionality in MappedPropertyDescriptor.

However MethodUtils also uses a static Map to cache "Method" instances (keyed by MethodDescriptor)
- the difference is that the Map in this case is a WeakHashMap. Does this resolve this issue?
If it doesn't then the MethodUtils static WeakHashMap be put inside a ContextClassLoaderLocal[2]
instance - which would mean there would be a cache of methods (i.e. Map) for each ClassLoader
in a WeakHashMap.

[1] http://svn.apache.org/viewvc?view=rev&revision=265760
[2] http://svn.apache.org/repos/asf/jakarta/commons/proper/beanutils/trunk/src/java/org/apache/commons/beanutils/ContextClassLoaderLocal.java


> [beanutils] Memory leak on webapp undeploy in MappedPropertyDescriptor
> ----------------------------------------------------------------------
>
>                 Key: BEANUTILS-156
>                 URL: https://issues.apache.org/jira/browse/BEANUTILS-156
>             Project: Commons BeanUtils
>          Issue Type: Bug
>          Components: Bean / Property Utils
>    Affects Versions: 1.6
>         Environment: Operating System: All
> Platform: All
>            Reporter: Simon Kitching
>         Assigned To: Niall Pemberton
>             Fix For: 1.8.0
>
>
> Class MappedPropertyDescriptor has a Hashtable declaredMethodCache containing a
> mapping from Class to Method[]. If this class were to be deployed via a shared
> webapp, then any reference in there to a class loaded via the webapp classloader
> will prevent the webapp classloader from being garbage-collected when the webapp
> is undeployed.

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