fails to customize an akka application log msg using logback and slf4j if Kamon is used

[colum...@gmail.com]

Hi all,

The application-logged msg of an akka application seems to be always directed to java.util.logging.
I want to customize the logging by using slf4j and logback.

In application.conf, I set
akka.loggers = ["akka.event.slf4j.Slf4jLogger"]

In build.sbt, I set
libraryDependencies ++= Seq(
otherjars,
"com.typesafe.akka" %% "akka-slf4j" % "2.3.3",
"ch.qos.logback" % "logback-classic" % "1.1.1",
"com.typesafe.scala-logging" %% "scala-logging" % "3.1.0"
)

I also set logback.xml as
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<encoder>
<!-- <pattern>%logger{1} - %msg%n</pattern> -->
<pattern>[%level{10}] [%date{ISO8601}] Thread:[%thread] SourceThread:[%X{sourceThread}] AkkaSource:[%X{akkaSource}] %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<logger name="akka" level="INFO" />
<logger name="sample.kamon" level="DEBUG"/>
<root level="ALL">
<appender-ref ref="CONSOLE"/>
</root>
</configuration>

When I run it, the application log msg is not in the expected form as
[INFO] [2014-09-30 17:51:20,609] Thread:[application-akka.actor.default-dispatcher-20] SourceThread:[application-akka.actor.default-dispatcher-19] AkkaSource:[akka://application/user/artifical/peak:generator] sample.kamon.PeakGenerator - schedule peak GenerateNumber
[DEBUG] [2014-09-30 17:51:24,408] Thread:[application-akka.actor.default-dispatcher-10] SourceThread:[] AkkaSource:[] sample.kamon.PeakGenerator - testing schedule peak!!!

but prefixed with an additional label as
[info] [INFO] [2014-09-30 17:51:20,609] Thread:[application-akka.actor.default-dispatcher-20] SourceThread:[application-akka.actor.default-dispatcher-19] AkkaSource:[akka://application/user/artifical/peak:generator] sample.kamon.PeakGenerator - schedule peak GenerateNumber
[info] [DEBUG] [2014-09-30 17:51:24,408] Thread:[application-akka.actor.default-dispatcher-10] SourceThread:[] AkkaSource:[] sample.kamon.PeakGenerator - testing schedule peak!!!

The label [info] seems to be coming from java.util.Logging and does not reflect the actual severity of the application log msg. How to remove it? If Kamon is not used, this problem won't happen.

Thanks again.

[colum...@gmail.com]

Just found it's due to the sample akka application, not related to kamon. This problem disappears when I use kamon on my own project.

[Diego Parra]

Thanks for sharing.

Cheers Diego.

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[colum...@gmail.com]

Just found the real cause of the problem. It's sbt forking jvm. The application should be started with the aspectj weaver, then it should be run on a forked jvm from sbt, then
http://www.scala-sbt.org/release/docs/Forking.html
If I configure the logback.xml to a file handler, the content of the log file will be ok. But I have to configure it to a console handler. The only solution is probably working on outputStrategy of sbt.