How can I add my own parameters in logback pattern configuration?

Question

I have some logback configuration:

<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
        <outputPatternAsHeader>true</outputPatternAsHeader>
        <pattern>[%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>

How can I add my own parameters in pattern? Something like:

<pattern>[%thread] %-5level %logger{35} %user.name %status - %msg%n</pattern>

Answer 1

Consider use of Logback Mapped Diagnostic Contexts MDC then put the parameter in MDC like this MDC.put( "userName", "George" );.

To print it with patternLayout do <pattern>[%thread] %-5level %logger{35} %X{userName} %status - %msg%n</pattern>