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https://issues.apache.org/jira/browse/GERONIMO-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim McConnell resolved GERONIMO-4497.
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Resolution: Fixed
Changed MultiParentClassLoader to use a HashSet to maintain of list of those
resources which have already been searched for, but not found, and thus
preventing multiple searches for the same "not found" resources. This
dramatically improves the performance when "not found" resources are searched
for multiple times (e.g., by the BIRT reporting engine) especially when many
parent classloaders are involved, and would otherwise have to be searched
again.
> Searching for resources in MultiParentClassLoader is not fully optimized
> ------------------------------------------------------------------------
>
> Key: GERONIMO-4497
> URL: https://issues.apache.org/jira/browse/GERONIMO-4497
> Project: Geronimo
> Issue Type: Bug
> Security Level: public(Regular issues)
> Components: kernel
> Affects Versions: 2.1.4, 2.2
> Reporter: Tim McConnell
> Assignee: Tim McConnell
> Fix For: 2.1.4, 2.2
>
>
> In one failing scenario, the BIRT reporting engine is invoked with an XML
> data file to generate a PDF report file. MultiParentClassLoader.getResource()
> is invoked many times to search for various XML resources (e.g.,
> DocumentBuilderFactory). MultiParentClassLoader searches through the current
> classloader and all the parent classloaders, which it should, but this can
> take a considerable amount of time if the resource is never found. It seems
> that once a resource has been searched for and not found, there is no need to
> search for it again in the same classloader hierarchy.
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