[KARAF-5016] Possible NPE while running "log:tail" in Karaf console

• Type: Bug
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 4.1.0
• Fix Version/s: 4.1.2
• Component/s: karaf
• Assignee: Guillaume Nodet
• Reporter: Richard Kosegi
• Created: 07/Mar/17 10:56
• Updated: 14/Sep/18 08:36
• Resolved: 07/Apr/17 15:03

Description

There is occasional NPE while running "log:tail" in Karaf console.

This occurs few times per day, it has no real impact other then tailing of log is stopped (and must be restarted by CTRL+C, log:tail)

Exception in thread "pool-51-thread-1" java.lang.NullPointerException
at org.apache.karaf.log.core.internal.layout.PatternParser$MDCPatternConverter.convert(PatternParser.java:551)
at org.apache.karaf.log.core.internal.layout.PatternConverter.format(PatternConverter.java:63)
at org.apache.karaf.log.core.internal.LogEventFormatterImpl.format(LogEventFormatterImpl.java:117)
at org.apache.karaf.log.command.DisplayLog.printEvent(DisplayLog.java:121)
at org.apache.karaf.log.command.DisplayLog.printEvent(DisplayLog.java:105)
at org.apache.karaf.log.command.LogTail$PrintEventThread.run(LogTail.java:113)
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)