Akka SLF4J logback configuration and usage

Question

I have done the following steps to try and configure logging for my akka application:

• created an application.conf file and placed it in src/main/resources. It looks like:

  
      akka { 
        event-handlers = ["akka.event.slf4j.Slf4jEventHandler"] 
        loglevel = "INFO"
      }
  

Answer 1

With this arrangement I can use an akka.event.Logging, no need to specify SLF4J instance.

(tested 13 Dec 2013)

I get console logging and logging to a file. To prove this is not built-in logger I changed to include %X{akkaTimestamp} as explained here:

http://doc.akka.io/docs/akka/snapshot/scala/logging.html

build.sbt

library dependencies: (Akka version 2.2.3)

...
"com.typesafe.akka" %% "akka-slf4j" % "2.2.3"
"ch.qos.logback" % "logback-classic" % "1.0.9"
...

src/main/resources/application.conf

akka {
  loggers = ["akka.event.slf4j.Slf4jLogger"]
  loglevel = "INFO"
}

src/main/resources/logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <target>System.out</target>
        <encoder>
            <pattern>%X{akkaTimestamp} %-5level[%thread] %logger{0} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>log/akka.log</file>
        <append>false</append>
        <encoder>
            <pattern>%date{yyyy-MM-dd} %X{akkaTimestamp} %-5level[%thread] %logger{1} - %msg%n</pattern>
        </encoder>
    </appender>

    <logger name="akka" level="INFO" />

    <root level="DEBUG">
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="FILE"/>
    </root>

</configuration>

This arrangement works when I use an ActorLogging mixin and also create a Logging directly:

import akka.event.Logging

val log = Logging(context.system, classOf[NameOfYourActor])

log.info("good luck!")