[LOG4J2-2885] Date patterns with microseconds do not work

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.13.3
• Fix Version/s: 3.0.0, 2.15.0
• Component/s: Core
• Assignee: Unassigned
• Reporter: cedric munger
• Created: 03/Jul/20 15:04
• Updated: 05/Aug/21 11:44
• Resolved: 04/Aug/21 06:11

Description

Logback fails to create appenders with a date pattern containing microseconds, such as: dd/MM/yy HH:mm:ss.nnnnnn resulting as the following error message during log4j initialization :

 

2020-07-03 16:56:40,691 main WARN Could not instantiate FastDateFormat with pattern dd/MM/yy HH:mm:ss.nnnnnn java.lang.IllegalArgumentException: Illegal pattern component: nnnnnn
 at org.apache.logging.log4j.core.util.datetime.FastDatePrinter.parsePattern(FastDatePrinter.java:311)
 at org.apache.logging.log4j.core.util.datetime.FastDatePrinter.init(FastDatePrinter.java:166)
 at org.apache.logging.log4j.core.util.datetime.FastDatePrinter.<init>(FastDatePrinter.java:159)
 at org.apache.logging.log4j.core.util.datetime.FastDateFormat.<init>(FastDateFormat.java:401)
 at org.apache.logging.log4j.core.util.datetime.FastDateFormat.<init>(FastDateFormat.java:386)
 at org.apache.logging.log4j.core.util.datetime.FastDateFormat$1.createInstance(FastDateFormat.java:108)
 at org.apache.logging.log4j.core.util.datetime.FastDateFormat$1.createInstance(FastDateFormat.java:105)
 at org.apache.logging.log4j.core.util.datetime.FormatCache.getInstance(FormatCache.java:86)
 at org.apache.logging.log4j.core.util.datetime.FastDateFormat.getInstance(FastDateFormat.java:151)

Only built in date pattern %d{DEFAULT_MICROS} work to have microseconds enabled in log statements.

Issue Links

• links to: GitHub Pull Request #548