Details
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Type:
Improvement
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Status: Resolved
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: 3.0
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Fix Version/s: 3.0
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Component/s: Core Runtime
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Labels:
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Flags:Patch
Description
I am using struts2 and under heavy load (around 100 threads) many threads are in BLOCKED state because of OgnlRuntime.findParameterTypes(). The actions we use have a generic superclass like:
public class PersonalCaptureAction extends DataCaptureAction<PersonalDTO>
OGNL handles this very bad, it enters
synchronized (_genericMethodParameterTypesCache)
all the time, at every property access of the Action. A possible workaround is to introduce another layer of superclass that is not generic.
I know that in current OGNL trunk (4.0-SNAPSHOT) caching has been rewritten, but Struts2 is using 3.0.5, and maybe it could be fixed as 3.0.6 in the git tree I found:
https://github.com/jkuhnert/ognl
I will attach a patch and a testcase.
Activity
Test that measures performance.
Results in sec before patch: 13.499, 21.348, 1.966, 3.434, 17.479, 1.161
Results in sec after patch: 7.375, 0.387, 0.313, 3.409, 1.064, 0.257
The typical workload in our case was test 5, which went from 17 sec to 1 sec.
Sorry for the question: is the patch designed to be applied in current ASF trunk or for the GitHub version?
It is designed for the github version, in ASF (4.0-SNAPSHOT) the whole caching has been rewritten.
thanks for clarifying - I would suggest you so to attach that patch to the GitHub project issue tracker, otherwise it would be not easy to get a chance they notice and apply it.
Yet another help you could give us, is pinging OGNL committers (some of them are Struts committers) on working towards a 4.0 release! 
I will merge it to OGNL git source and prepare a new version.
Or could you prepare a pull request ?
Done, I was able to merge the patch into current source code
it'll be included with 3.0.6 release
Thank you. Monday and Tuesday were a national holiday in Hungary, that is why I did not read your answer until today.
By the way, is there any plan to release OGNL 4.0, and Struts2 depending on OGNL 4.0? I have seen some activity in 2011, but this year not so much.
The plan is 
I started working on that few days ago, basically what's needed is to satisfy RM needs which means all the reports have to be green
Patch to fix this issue