Set/Change list properties in application.properties in Akka

Question

I want to use slf4j for logging, based on logging doc. These config should be changed in application.conf:

akka {
  loggers = ["akka.event.slf4j.Slf4jLogger"]
  logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
}

I'm using application.properties instead of application.conf:

akka.loggers[0]=akka.event.slf4j.Slf4jLogger
akka.logging-filter=akka.event.slf4j.Slf4jLoggingFilter

But above config does not change akka.loggers value (the value is still the default value: akka.event.Logging$DefaultLogger).

Printing all configuration:

"loggers" : [
    # reference.conf @ jar:file:/home/user/.m2/repository/com/typesafe/akka/akka-actor_2.12/2.5.18/akka-actor_2.12-2.5.18.jar!/reference.conf: 17
    "akka.event.Logging$DefaultLogger"
],
# application.properties @ file:/home/user/workspace/x-platform/target/test-classes/application.properties
"loggers[0]" : "akka.event.slf4j.Slf4jLogger",
# application.properties @ file:/home/user/workspace/x-platform/target/test-classes/application.properties
"logging-filter" : "akka.event.slf4j.Slf4jLoggingFilter",

So my question is: how can i set/change value for a list prpperty in application.properties?

I'm using akka 2.5.18 with Java.

Answer 1

Have you tried this the parseString thing?

val customConf = ConfigFactory.parseString("""
      akka {
        loggers = ["akka.event.slf4j.Slf4jLogger"]
        logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
      }
      """)
val system = ActorSystem("MySystem", ConfigFactory.load(customConf))

or combining custom config with the usual one

Config myConfig =ConfigFactory.parseString("loggers=['akka.event.slf4j.Slf4jLogger']");
Config regularConfig = ConfigFactory.load();
Config combined = myConfig.withFallback(regularConfig);