Hi all, Cursory googling/ML search didn't turn anything up so I thought I'd ask a (possibly dumb) question. I'm working on a custom encoder (tried a LayoutBase as well, same issue described below) in order to output JSON formatted log messages. The reason I'm going down this particular route vs using the existing JSON layout extension is that for some messages, I need to append additional sub documents (log messages will go through logstash to ElasticSearch and possibly HDFS). My issue: I don't seem to be receiving "ERROR" level messages in my encoder although the same test code using a pattern layout seems to pass through error messages just fine. Simple encoder implementation (in Scala but should be intelligible regardless) follows, JSON stuff absent: class SimpleEncoder[T] extends EncoderBase[T] { override def close() {} override def doEncode(event: T) { event match { case loggingEvent: ILoggingEvent => { outputStream.write(loggingEvent.getArgumentArray().head.toString.getBytes()) outputStream.flush() } case other => { outputStream.write(s"OTHER: ${other}".getBytes()) outputStream.flush() } } } } logback.xml: <configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder class="com.sample.logging.SimpleEncoder"/> </appender> <root level="DEBUG"> <appender-ref ref="STDOUT" /> </root> </configuration> Am I missing anything obvious? Thanks, Jeremy