Import Maven dependency

   <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.12.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.12.1</version>
        </dependency>

Configuration File

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
    <Properties>
        <Property name="logPath">./</Property>
        <Property name="rollingFileName">log4j2_demo_log</Property>
        <Property name="logPath">/var/log/log4j2</Property>
    </Properties>
    <Appenders>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
        </Console>
        <RollingFile name="rollingFile" fileName="${logPath}/${rollingFileName}.log" filePattern="${logPath}/${rollingFileName}_%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="[%highlight{%-5level}] %d{DEFAULT} %c{1}.%M() - %msg%n%throwable{short.lineNumber}" />
            <Policies>
                <!-- Causes a rollover if the log file is older than the current JVM's start time -->
                <OnStartupTriggeringPolicy />
                <!-- Causes a rollover once the date/time pattern no longer applies to the active file -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="TRACE" additivity="false">
            <AppenderRef ref="console" />
            <AppenderRef ref="rollingFile" />
        </Root>
    </Loggers>
</Configuration>

Code

package log4j2demo;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Log4j2Demo {
    private static final Logger logger = LogManager.getLogger(Log4j2Demo.class);

    public static void main(String[] args) {
        logger.trace("trace message");
        logger.info("info message");
        logger.debug("debug message");
        logger.error("error message");
    }
}

Console Output

[TRACE] 2019-10-03 14:31:42,481 Log4j2Demo.main() - trace message
[INFO ] 2019-10-03 14:31:42,484 Log4j2Demo.main() - info message
[DEBUG] 2019-10-03 14:31:42,484 Log4j2Demo.main() - debug message
[ERROR] 2019-10-03 14:31:42,485 Log4j2Demo.main() - error message

Log file output

Source Code

https://github.com/AndrewProgramming/LearnJavaByExample