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From "Mike (JIRA)" <>
Subject [jira] Commented: (GERONIMO-4497) Searching for resources in MultiParentClassLoader is not fully optimized
Date Mon, 27 Apr 2009 16:16:30 GMT


Mike commented on GERONIMO-4497:

I think this problem may still exist.  In the same environment (Geronimo 2.1.4 running an
app that loads the BIRT report engine) we are seeing a report that should finish in 5 to 10
minutes take several hours.  While profiling the Geronimo process we have found that the majority
of the time is spent in MultiParentClassLoader.loadClass().  Taking Geronimo out of the picture
and running this report from the BIRT development environment (Eclipse w/ BIRT plugin) against
the same database the report finishes in under 10 minutes.

Was this fixed confirmed?

> Searching for resources in MultiParentClassLoader is not fully optimized
> ------------------------------------------------------------------------
>                 Key: GERONIMO-4497
>                 URL:
>             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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