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Play 2.0 usa logback cómo servicio de log de auditoría.

La forma más sencilla de configurar el nivel del log es usar la palabra reservada logger en su archivo conf/application.conf.

Play define un logger por defecto para su aplicación, que es usada automáticamente cuándo usa las operaciones predeterminadas del 'logger'

Play defines a default application logger for your application, which is automatically used when you use the default Logger operations.

# Root logger:
logger=ERROR

# Logger used by the framework:
logger.play=INFO

# Logger provided to your application:
logger.application=DEBUG

The root logger configuration affects all log calls, rather than requiring custom logging levels. Additionally, if you want to enable the logging level for a specific library, you can specify it here. For example to enable TRACE log level for Spring, you could add:

logger.org.springframework=TRACE

The default is to define two appenders, one dispatched to the standard out stream, and the other to the logs/application.log file.

If you want to fully customize logback, just define a conf/logger.xml configuration file. Here is the default configuration file used by Play:

<configuration>
    
  <conversionRule conversionWord="coloredLevel" converterClass="play.api.Logger$ColoredLevel" />
  
  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <file>${application.home}/logs/application.log</file>
     <encoder>
       <pattern>%date - [%level] - from %logger in %thread %n%message%n%xException%n</pattern>
     </encoder>
   </appender>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%coloredLevel %logger{15} - %message%n%xException{5}</pattern>
    </encoder>
  </appender>
  
  <logger name="play" level="INFO" />
  <logger name="application" level="INFO" />

  <root level="ERROR">
    <appender-ref ref="STDOUT" />
    <appender-ref ref="FILE" />
  </root>
  
</configuration>

You can also specify another logback configuration file via a System property. It is particulary useful when running in production.

Specify another loback configuration file to be loaded from the classpath:

$ start -Dlogger.resource=conf/prod-logger.xml

Specify another loback configuration file to be loaded from the file system:

$ start -Dlogger.file=/opt/prod/logger.xml

Specify another loback configuration file to be loaded from an URL:

$ start -Dlogger.url=http://conf.mycompany.com/logger.xml