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From "Tim McConnell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (GERONIMO-4497) Searching for resources in MultiParentClassLoader is not fully optimized
Date Wed, 07 Jan 2009 21:24:44 GMT

    [ https://issues.apache.org/jira/browse/GERONIMO-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661715#action_12661715
] 

Tim McConnell commented on GERONIMO-4497:
-----------------------------------------

Hi Jeff, this change to MultiParentClassLoader improves the performance of Geronimo 2.1.4
for the BIRT reporting engine scenario to be almost identical to the performance in Geronimo
1.1.1 (where the xercesImpl.jar and xmlParserAPIs.jar files were located in the endorsed lib
directory, and thus were immediately found). Could you download the latest Geronimo 2.1.4
snapshot and rerun your test without utilizing the endorsed lib directory ?? 

> 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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