[logback-user] Logback Joran Custom Conversion Rule

Jennifer Donahoe jlueding at gmail.com
Mon Apr 5 16:39:38 CEST 2021

I'm trying to create a console appender that uses a custom pattern and a
custom conversion rule to run the logback logs through the DataConverter
class. I can see in the logs that the new conversion rule gets created but
the logs get dropped after that point. I assume some setup in the below
code is not correct but I'm not sure where I'm going wrong.

ConsoleAppender<ILoggingEvent> appender = new ConsoleAppender<>()


RuleStore rs = new SimpleRuleStore(context)

Interpreter interpreter = new Interpreter(context, rs, new ElementPath())

InterpretationContext interpretationContext =


AttributesImpl attributes = new AttributesImpl()

attributes.addAttribute("","","conversionWord", "", "msgMask")

attributes.addAttribute("","","converterClass", "",

ConversionRuleAction conversionRule = new ConversionRuleAction()


conversionRule.begin(interpretationContext, conversionWord, attributes)

PatternLayoutEncoder encoder = new PatternLayoutEncoder()


encoder.setPattern('-%clr(%d{-yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(-%5p)
%clr(-){magenta} %clr(---){faint} %clr([%t]){faint}
%clr(%-40.40logger{39}){cyan} %clr(:){faint} %msgMask(%msg) %n')





//the appender is later added to the logger

I created a question in StackOverflow about this as well:

Please let me know if you have any examples of this setup or if you can
pinpoint where I’m going wrong.

Thank you,


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