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From "Pelladi Gabor (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (WW-3902) Performance - Locks in class loader
Date Wed, 17 Oct 2012 13:40:04 GMT

     [ https://issues.apache.org/jira/browse/WW-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pelladi Gabor updated WW-3902:
------------------------------

    Attachment: WW-3902.diff

Patch to fix locking problem
                
> Performance - Locks in class loader
> -----------------------------------
>
>                 Key: WW-3902
>                 URL: https://issues.apache.org/jira/browse/WW-3902
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Plugin - JSON
>    Affects Versions: 2.3.5
>            Reporter: Pelladi Gabor
>            Priority: Minor
>              Labels: patch, performance
>         Attachments: WW-3902.diff
>
>
> JSONWriter is causing locks in class loader, because it always invokes Introspector.getBeanInfo().
That in turn tries to load a class with "BeanInfo" suffix in Introspector.findExplicitBeanInfo().
Such class does not exists, but we try to load it over and over again for every JSON result.
Class loading involves a lock in the application server, and this causes performance issue
in heavily multithreaded applications.
> This could be solved by caching the BeanInfo for the classes, for which I have created
a patch.
> The issue is also mentioned here:
> http://stackoverflow.com/questions/12728860/java-performance-issue-tomcat-webappclassloader-locked

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