Using logback with Akka - scala

Question

I have some problems using Logback with my Akka (2.3.9) application. In order to log to stdout and in the logfile, I specified the logback.xml with all appenders:
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="5 seconds" debug="true">
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<encoder>
<pattern>%X{akkaTimestamp} %-5level %logger{36} %X{sourceThread} - %msg%n</pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>./akka.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>./akka.log.%d{yyyy-MM-dd-HH}</fileNamePattern>
</rollingPolicy>
<encoder>
<pattern>%X{akkaTimestamp} %-5level %logger{36} %X{sourceThread} - %msg%n</pattern>
</encoder>
</appender>
<logger name="proc" level="INFO">
<appender-ref ref="FILE"/>
<appender-ref ref="STDOUT"/>
</logger>
<logger name="akka.actor" level="INFO">
<appender-ref ref="FILE"/>
<appender-ref ref="STDOUT"/>
</logger>
<root level="INFO">
<appender-ref ref="FILE"/>
<appender-ref ref="STDOUT"/>
</root>
</configuration>
After that I use logging in my Actor:
val log = Logging(context.system, classOf[MyActor])
override def receive: Receive = {
case MyEvent(event) =>
log.info("Message received for processing.")
}
The problem is, in SBT everything is fine: I can see all log events in the created logfile.
When I make JAR-File with sbt-assembly and start this jar file (java -jar event-assembly-0.1.1-SNAPSHOT.jar). The app writes log entries to STDOUT but not in the file!
I have no idea how I can fix that. I tried with "lsof", the java process has no open log-files.

Answer 1

I don't know what's wrong but you could do the following:
Check if your logback.xml is in the jar-file
Try to start your application with java -Dlogback.configurationFile=/path/to/logback.xml -jar event-assembly-0.1.1-SNAPSHOT.jar

Answer 2

So, how I found out, the sbt-assembly removed some logback-binaries from the result jar (it was settings in my Build.scala). After I changed the MergingStrategy to preserve the first logback occurrence in the result build, all works correctly.