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From "Pelladi Gabor (JIRA)" <>
Subject [jira] [Created] (WW-3902) Performance - Locks in class loader
Date Wed, 17 Oct 2012 13:38:02 GMT
Pelladi Gabor created WW-3902:

             Summary: Performance - Locks in class loader
                 Key: WW-3902
             Project: Struts 2
          Issue Type: Improvement
          Components: Plugin - JSON
    Affects Versions: 2.3.5
            Reporter: Pelladi Gabor
            Priority: Minor

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:

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