Don't hold locks as long when creating validators in
AnnotationActionValidatorManager
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Key: WW-3461
URL: https://issues.apache.org/jira/browse/WW-3461
Project: Struts 2
Issue Type: Improvement
Affects Versions: 2.1.6
Reporter: Leigh Anderson
Under load, the lock held in AnnotationActionValidatorManager.getValidators on
validatorCache becomes contended. This lock is currently held while all the
validators are created. The attached patch reduces the scope of the lock to
just doing the cache lookup + taking a defensive copy of the list of validators
for that key. This improved throughput and latency in our tests.
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