Logback logs to STDOUT and not the file

[Aqua Pevi]

Hi,

I have a simple Akka application based off of akka-sample-main-java template. I am trying to log into a log file rather than the STDOUT. The pom.xml has dependencies on akka-actor, akka-slf4j and logback-classic. The following are my application.conf and logback.xml. Both are placed in src/main/resources.

application.conf

akka {

  

  loggers = ["akka.event.slf4j.Slf4jLogger"]

stdout-loglevel = "OFF"

}

logback.xml

<configuration>

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

<!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder 

by default -->

<encoder>

<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n

</pattern>

</encoder>

</appender>

<appender name="FILE" class="ch.qos.logback.classic.sift.SiftingAppender">

<!-- Set the value via Mapped Diagnostic Context (MDC) in code. -->

<discriminator>

<key>logBasename</key>

<defaultValue>Test</defaultValue>

</discriminator>

<sift>

<appender name="FILE-${LogBasename}"

class="ch.qos.logback.core.rolling.RollingFileAppender">

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

<fileNamePattern>log/application.log</fileNamePattern>

<maxHistory>30</maxHistory>

<timeBasedFileNamingAndTriggeringPolicy

class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

<!-- or whenever the file size reaches 5MB -->

<maxFileSize>5MB</maxFileSize>

</timeBasedFileNamingAndTriggeringPolicy>

</rollingPolicy>

<encoder>

</encoder>

</appender>

</sift>

</appender>

<root level="INFO">

<appender-ref ref="FILE" />

<!-- <appender-ref ref="STDOUT" /> -->

</root>

</configuration>

Even with STDOUT turned off in application.conf, the logs are shown in the console and not in the logs. In fact,, no logs are created.

Can some one help me with this, please?

Thanks!

[Richard Bradley]

It looks like it should work.

How are you running the application? "sbt run"?

Are you able to post the code to github?

[Aqua Pevi]

Hi,

I tried to turn on logback file logger for the sample using the template at http://www.typesafe.com/activator/template/akka-sample-main-java

That does not log to a file as well. Just the console.

I am assuming the UI uses sbt run to run the app.

[Richard Bradley]

I tried to reproduce your problem, and I think the issue is in your logback config.

I think the "sift" appender is misconfigured somehow. If I replace that appender with a vanilla "file" appender, then things work fine.

If you want to see the code I used, I have pushed it to my GitHub:

https://github.com/RichardBradley/akka/commits/logback-write-to-file

https://github.com/RichardBradley/akka/commit/00fa0f2556a7b96bdc59b2076801a75ae9a8bcf7

You should be able to run:

$ git clone g...@github.com:RichardBradley/akka.git

...

$ cd akka

$ git checkout logback-write-to-file

...

$ cd akka-samples/akka-sample-main-java

$ sbt run

[info] Loading project definition from akka\akka-samples\akka-sample-main-java\project

[info] Set current project to akka-sample-main-java (in build file:akka/akka-samples/akka-sample-main-java/)

[info] Compiling 1 Java source to akka\akka-samples\akka-sample-main-java\target\scala-2.10\classes...

Multiple main classes detected, select one to run:

 [1] sample.hello.Main

 [2] sample.hello.Main2

Enter number: 2

[info] Running sample.hello.Main2

Hello World!

[success] Total time: 3 s, completed 06-Jul-2015 12:33:50

$ cat testFile.log

202  [Hello-akka.actor.default-dispatcher-4] INFO  akka.event.slf4j.Slf4jLogger - Slf4jLogger started

244  [Hello-akka.actor.default-dispatcher-3] INFO  sample.hello.Main2$Terminator - akka://Hello/user/helloWorld has terminated, shutting down system

You could check the Logback docs for instructions on how to use the SiftAppender, or ask on their mailing list?

(It does seem a bit rubbish that the SiftAppender will silently fail if misconfigured in this way.)

Good luck,

Rich