[WW-3902] Performance - Locks in class loader

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.7
• Fix Version/s: 2.3.7
• Component/s: Plugin - JSON
• Labels: patch performance
• Flags: Patch
• Assignee: Lukasz Lenart
• Reporter: Pelladi Gabor
• Created: 17/Oct/12 13:37
• Updated: 20/Jun/15 16:44
• Resolved: 17/Oct/12 18:34

Description

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

Issue Links

• is related to: WW-4516 BeanInfo caching does not work when using Hotswap/Rapid-development tools.