reconfigure logback timezone at runtime

readme.md

You can run this with scala-cli:

$ scala-cli https://gist.github.com/chadselph/c1d115a4222d890f6bb4e8147281539b

... (lots of logback config debug logging) ...


16:02:58.183-0700 INFO  - Before setting timezone

00:02:58.186+0100 INFO  - After setting timezone

logback.xml

<configuration scan="true">

  <property name="TIMEZONE" value="UTC" />
  <!-- For writing log info to console.  -->
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%n%d{HH:mm:ss.SSSZ} %-5level - %msg%n</pattern>
    </encoder>
  </appender>

  <!-- Set default level of logging. -->
  <root level="info">
    <appender-ref ref="STDOUT" />
  </root>

</configuration>

LogbackTest.scala

//> using dep ch.qos.logback:logback-classic:1.5.18
//> using resourceDir ./
import org.slf4j.LoggerFactory
import java.util.TimeZone
import ch.qos.logback.classic.LoggerContext
import ch.qos.logback.classic.util.ContextInitializer



@main
def main() =
  val logger = LoggerFactory.getLogger("logger")
  logger.info("Before setting timezone")
  TimeZone.setDefault(TimeZone.getTimeZone("Portugal"))
  val context = LoggerFactory.getILoggerFactory().asInstanceOf[LoggerContext]
  val ci =  new ContextInitializer(context)
  context.reset()
  ci.autoConfig()

  logger.info("After setting timezone")