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https://issues.apache.org/jira/browse/WW-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478270#comment-13478270
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Hudson commented on WW-3902:
----------------------------
Integrated in Struts2 #547 (See [https://builds.apache.org/job/Struts2/547/])
WW-3902 adds cache for BeanInfo to improve performance and avoid dead locks
(Revision 1399375)
Result = SUCCESS
lukaszlenart :
Files :
*
/struts/struts2/trunk/plugins/json/src/main/java/org/apache/struts2/json/JSONWriter.java
> 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
> Assignee: Lukasz Lenart
> Priority: Minor
> Labels: patch, performance
> Fix For: 2.3.6
>
> 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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