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From "Andreas Veithen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AXIS2-5118) In high load scenarios with many threads, the call to Introspector.getBeanInfo(Class,Class) causes high synchronization resulting in system stall
Date Thu, 11 Aug 2011 15:53:27 GMT

    [ https://issues.apache.org/jira/browse/AXIS2-5118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083178#comment-13083178
] 

Andreas Veithen commented on AXIS2-5118:
----------------------------------------

This is basically a duplicate of AXIS2-4524 and AXIS2-4878, and the same concern applies here:
implementing the cache like that will result in a class loader leak.

> In high load scenarios with many threads, the call to Introspector.getBeanInfo(Class,Class)
causes high synchronization resulting in system stall
> -------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AXIS2-5118
>                 URL: https://issues.apache.org/jira/browse/AXIS2-5118
>             Project: Axis2
>          Issue Type: Improvement
>          Components: adb
>    Affects Versions: 1.5.4
>         Environment: Tomcat 7 with axis2 webservices
>            Reporter: Ronald Brindl
>         Attachments: BeanInfoCache.java, BeanInfoCacheTest.java, BeanUtil.java
>
>
> I have a high load scenario, where a Clustered Web frontend does Webservice calls to
a Backend Webservices. 
> There are around 200 Threads handling the webservices.
> The CPU load of the machine went to near zero.
> Using dynatrace, we realized, that all the calls went through BeanUtils.getPropertyQnameList,
which in turn calls Introspector.getBeanInfo(beanClass, beanClass.getSuperclass());
> This again calls WebAppClassLoader.loadClass(String name, boolean resolve), which is
synchronized.
> I fixed this problem by modifying BeanUtil.getPropertyQnameList so that it caches BeanInfo
objects.

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