Lucas Pouzac created LOG4J2-869:
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Summary: Monitor contention at
org.apache.logging.log4j.core.util.Loader.*
Key: LOG4J2-869
URL: https://issues.apache.org/jira/browse/LOG4J2-869
Project: Log4j 2
Issue Type: Improvement
Components: Core
Affects Versions: 2.0.2, 2.0.1, 2.1
Reporter: Lucas Pouzac
Fix For: 2.1, 2.0.2
Attachments: monitor_contention_log4j.png
Loader.initializeClass() / Loader.loadClass() indirectly calls
Class.forName0(), which calls into JRE lib method causing monitor contention.
See screen shot
Fix by caching values returned by Class.forName() in a static ConcurrentMap
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