Using logback-classic in Maven:

    <dependency> 

      <groupId>ch.qos.logback</groupId>

      <artifactId>logback-classic</artifactId>

      <version>1.5.18</version>

      <scope>runtime</scope> 

    </dependency> 

If one <root> appender-ref is defined (STDOUT) but another is undefined (CLOUD_LOGGING):

  <root level="info"> 

    <appender-ref ref="STDOUT" />

    <appender-ref ref="CLOUD_LOGGING" />   

  </root>

logback fails to  set the defined appender in <root>.

In main() after server.start()

I see WARN in Logger[org.eclipse.jetty.server.Server] - No appenders present in context [default] for logger [org.eclipse.jetty.server.Server].

Is this expected behaviour ? Would be better if it selected whichever is defined.