How to prevent logback from outputting its own status at the start of every log?

Question

This seems like a carelessness error, but I can't seem to find the cause. Logging with logback/slf4j (most recent version slf4j-api-1.6.1, logback core/classic 0.9.24). Simplest log configuration for testing is:

<configuration>
 <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
  <layout class="ch.qos.logback.classic.PatternLayout">
   <!-- DONT USE THIS FORMATTER FOR LIVE LOGGING THE %L LINE NUMBER OUTPUTTER IS SLOW -->
   <pattern>%le %-1r [%c{1}:%L] %m%n</pattern>
  </layout>
 </appender>
 <root level="DEBUG">
  <appender-ref ref="stdout" />
 </root>
</configuration>

Every log setup starts with logback's internal status lines:

11:21:27,825 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
11:21:27,826 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback-test.xml] at [file:.../logback-test.xml]
11:21:28,116 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
11:21:28,124 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
11:21:28,129 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [stdout]
11:21:28,180 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Pushing component [layout] on top of the object stack.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - This appender no longer admits a layout as a sub-component, set an encoder instead.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - To ensure compatibility, wrapping your layout in LayoutWrappingEncoder.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - See also http://logback.qos.ch/codes.html#layoutInsteadOfEncoder for details
11:21:28,207 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
11:21:28,207 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [stdout] to Logger[ROOT]

which is, according to the docs, the format logback uses for default. It then finishes reading the config (which is set up to output a different format) and continues with the properly formatted output. There's a config parameter <configuration debug="false"> which does not affect this.

Anyone know how to shut this off?

Answer 1

As described in the docs, if warnings or errors occur during the parsing of the configuration file, logback will automatically print status data on the console.

Follow http://logback.qos.ch/codes.html#layoutInsteadOfEncoder i.e. the link mentioned by logback in its warning message. Once you follow the steps mentioned therein, that is, if you replace <layout> element with <encoder>, logback will stop printing messages on the console.