[KAFKA-7009] Mute logger for reflections.org at the warn level in system tests

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 0.10.0.2, 0.10.1.2, 0.10.2.2, 0.11.0.3, 2.0.0, 2.1.0
• Component/s: connect, system tests
• Assignee: Randall Hauch
• Reporter: Randall Hauch
• Created: 06/Jun/18 14:20
• Updated: 13/Jun/18 05:58
• Resolved: 13/Jun/18 05:58

Description

AK's Log4J configuration file for Connect includes these lines:

log4j.logger.org.apache.zookeeper=ERROR
log4j.logger.org.I0Itec.zkclient=ERROR
log4j.logger.org.reflections=ERROR

The last one suppresses lots of Reflections warnings like the following that are output during classpath scanning and are harmless:

[2018-06-06 13:52:39,448] WARN could not create Vfs.Dir from url. ignoring the exception and continuing (org.reflections.Reflections)
org.reflections.ReflectionsException: could not create Vfs.Dir from url, no matching UrlType was found [file:/usr/bin/../share/java/confluent-support-metrics/*]
either use fromURL(final URL url, final List<UrlType> urlTypes) or use the static setDefaultURLTypes(final List<UrlType> urlTypes) or addDefaultURLTypes(UrlType urlType) with your specialized UrlType.
    at org.reflections.vfs.Vfs.fromURL(Vfs.java:109)
    at org.reflections.vfs.Vfs.fromURL(Vfs.java:91)
    at org.reflections.Reflections.scan(Reflections.java:240)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader$InternalReflections.scan(DelegatingClassLoader.java:373)
    at org.reflections.Reflections$1.run(Reflections.java:198)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

The last line also need to be added to [Connect's Log4J configuration file in the AK system tests|https://github.com/apache/kafka/blob/trunk/tests/kafkatest/services/templates/connect_log4j.properties.

Issue Links

• links to: GitHub Pull Request #5151