[LOG4J2-2196] Pattern layout %notEmpty does not work for exceptions

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.10.0
• Component/s: Pattern Converters
• Assignee: Unassigned
• Reporter: Raman Gupta
• Created: 17/Jan/18 07:44
• Updated: 29/Jan/18 21:20

Description

Using a pattern layout that contains something like:

%notEmpty{EXCEPTION: %throwable}

kind of works. However, when the Exception is not empty, it prints the Exception to the appender twice: once in the proper position within the pattern, and then again completely separately, with a newline before the second output.

Note that the second output completely ignores any formatting specifications, such as separator or level-based ansi coloring – it seems as if the output of Exception.toString() had been sent to the appender directly).