So I investigated running the app with -Dakka.log-config-on-start=on.
I couldn't get any associated config output until I reverted log.conf to
use the default logger:
akka {
log-config-on-start=on
log-dead-letters = 0
log-dead-letters-during-shutdown = off
warn-about-java-serializer-usage = off
loglevel = INFO
stdout-loglevel = INFO
loggers = ["akka.event.Logging$DefaultLogger"]
//loggers = ["akka.event.slf4j.Slf4jLogger"]
//logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
}
...and then I get loads of config output to the log, especially from
reference.conf dragged in from some other dependency.
Clearly, my understanding of how {assembly fat jars, configuration loading,
external config files, slf4j, logback} hang together is not complete!
I'll continue investigation as to why I get no output (at all) with:
akka {
log-dead-letters = 0
log-dead-letters-during-shutdown = off
warn-about-java-serializer-usage = off
loglevel = INFO
stdout-loglevel = INFO
loggers = ["akka.event.slf4j.Slf4jLogger"]
logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
}
and
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<encoder>
<pattern>!check! %X{akkaTimestamp}| %-6level| %logger{36}|
%X{sourceActorSystem}| %msg%n</pattern>
</encoder>
</appender>
<logger name="akka" level="error" />
<logger name="akka.cluster.Cluster" level="error" />
<logger name="jobs" level="info" />
<logger name="jobsHttp" level="info" />
<root level="info">
<appender-ref ref="CONSOLE"/>
</root>
</configuration>
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