[jboss-jira] [JBoss JIRA] (LOGMGR-263) Logger Lookup is much slower as with JDK 8

Logger Lookup is much slower as with JDK 8 ------------------------------------------ Key: LOGMGR-263 URL: https://issues.redhat.com/browse/LOGMGR-263 Project: JBoss Log Manager Issue Type: Bug Environment: WildFly 17, OpenJDK 11 Reporter: Andreas Liebscher Assignee: James Perkins Priority: Critical Attachments: ClassInEar.java, LogContextCacher.java, getlogger-stack.txt, grafik1570016303722 (1).png, grafik1570016303722.png, grafik1570016791285.png, logger-demo.war, responsetimes.png During upgrading a Java EE application from WildFly 13 with JDK 8 to WildFly 17 with JDK 11 we had a serious performance issue. We identified the usage of the logging framework SLF4J with the pattern `Logger log = LoggerFactory.getLogger(XXX.class)` was the reason when a lot of calls to `getLogger` occur in parallel. As workaround we added `static` to some code hotspots to get back the performance we were used to. Also WildFly 13 with JDK 8 got a performance improvement with the added `static` keyword. Please check the VisualVM output as prove of JDKSpecific got slower: