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logging tips with log4j2 and slf4j / published by https://github.com/dacr/code-examples-manager #44be33f5-2c29-469c-9cc6-02d74a2e1ea8/505973193ee2ab4097ae7c97ad58386ba305f4c5
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// summary : logging tips with log4j2 and slf4j | |
// keywords : logging, tips, cheatsheet, slf4j, log4j2, @testable | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : 44be33f5-2c29-469c-9cc6-02d74a2e1ea8 | |
// created-on : 2020-10-28T20:43:15Z | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "3.2.2" | |
//> using dep "org.apache.logging.log4j:log4j-api:2.20.0" | |
//> using dep "org.apache.logging.log4j:log4j-core:2.20.0" | |
//> using dep "org.apache.logging.log4j:log4j-slf4j-impl:2.20.0" | |
// --------------------- | |
import org.slf4j.{Logger, LoggerFactory} | |
import org.apache.logging.log4j.{LogManager,Level} | |
import org.apache.logging.log4j.core.LoggerContext | |
import java.lang.invoke.MethodHandles | |
import org.slf4j.LoggerFactory | |
println("A way to change log4j2 configuration programmatically Through the LoggerContext") | |
val context = LogManager.getContext(false).asInstanceOf[LoggerContext] | |
val config = context.getConfiguration() | |
val rootConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME) | |
rootConfig.setLevel(Level.DEBUG) | |
context.updateLoggers() | |
object LoggingTips { | |
val logger = LoggerFactory.getLogger(MethodHandles.lookup.lookupClass) | |
logger.info("Thanks to MethodHandles, the classname is found automatically !") | |
def go():Unit = { | |
logger.info("GO {}", 42L) | |
} | |
} | |
LoggingTips.go() |
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