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Bug
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Resolution: Unresolved
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Minor
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None
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Jenkins 2.150.3
JVM Version 1.8.0_181-b02
Apache Tomcat 8.5.38
Tomcat started with all logging bridged to log4j2 via -Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager
Tomcat enables DEBUG (FINE) logging for everything
Goal: More operational insight into Jenkins
Starting up a newly-downloaded Jenkins 2.150.3 with the FINE level enabled currently logs this misleading stacktrace about 20 times:
23:15:27.375 [pool-7-thread-9] DEBUG hudson.ExtensionList - Loading ExtensionList: class hudson.ExtensionFinder23:15:27.375 [pool-7-thread-9] DEBUG hudson.ExtensionList - Loading ExtensionList: class hudson.ExtensionFinder
java.lang.Throwable: null
at hudson.ExtensionList.load(ExtensionList.java:378) ~[?:?]
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:318) ~[?:?]
at hudson.ExtensionList.getComponents(ExtensionList.java:183) ~[?:?]
at jenkins.model.Jenkins$6.onInitMilestoneAttained(Jenkins.java:1114) ~[?:?]
at jenkins.InitReactorRunner$1.onAttained(InitReactorRunner.java:83) ~[?:?]
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.lambda$onAttained$3(ReactorListener.java:102) ~[?:?]
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.run(ReactorListener.java:109) ~[?:?]
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.onAttained(ReactorListener.java:102) ~[?:?]
at org.jvnet.hudson.reactor.Reactor$1.run(Reactor.java:177) ~[?:?]
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_181]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
In looking at the code, a new Throwable is created when this message is logged. If we left that out, we'd get the nice DEBUG message without the concerning stacktrace.
