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https://issues.apache.org/jira/browse/OPENJPA-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Linskey updated OPENJPA-1755:
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Attachment: (was: OPENJPA-1755.txt)
> MultiClassLoader relies on its underlying ClassLoaders for hashCode
> -------------------------------------------------------------------
>
> Key: OPENJPA-1755
> URL: https://issues.apache.org/jira/browse/OPENJPA-1755
> Project: OpenJPA
> Issue Type: Bug
> Reporter: Patrick Linskey
> Attachments: OPENJPA-1755.txt
>
>
> The MultiClassLoader relies on its underlying ClassLoaders in its hashing
> algorithm. This is problematic if the underlying classloaders refuse to
> return a hash or if the classloader list changes over time.
> I ran into a problem that demanded a resolution to this issue when doing some
> work with OpenJPA in a Google AppEngine context. I don't have a stack trace
> handy.
> An effective-yet-ugly fix was to simply change the hashCode() implementation
> to return a constant value (I chose '1'). This clearly is a crappy hashing
> algorithm, but will always respect the hashing contract. And I don't think
> that we really put MultiClassLoaders into big maps or anything.
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