[JAVA] Try using Log4j 2.0


It's easy, but I'll show you how to use log4j 2.0 as a reminder. Investigate for use when creating small Java apps.

Maven dependency definition

Added log4j to Maven used for library management



Create configuration file

Set to output logs to standard output.


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE project>
<Configuration status="off">
		<Property name="format1">%d{yyyy/MM/dd HH:mm:ss.SSS} [%t] %-6p %c{10} %m%n</Property>
		<Console name="Console" target="SYSTEM_OUT">

		<Root level="trace">
			<AppenderRef ref="Console" />


The name of the logger should just be copied and pasted using lookup.

public class Hoge {
  private static final Logger logger = LogManager.getLogger(MethodHandles.lookup().lookupClass());
  public void sayHoge() {
    logger.info("hoge hoge");

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