public class App {    private static final Logger LOG = LoggerFactory.getLogger(App.class);    public static void main(String[] args) {        System.out.println("Hello World!");        LOG.info("Hello World!");    }}

<?xml version="1.0" encoding="UTF-8"?><!--   Example LOGBACK Configuration File  http://logback.qos.ch/manual/configuration.html  --><configuration>  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">    <encoder>      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>    </encoder>  </appender>  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">    <file>./logs/myLog.log</file>    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">      <!-- daily rollover -->      <fileNamePattern>myLog_%d{yyyy-MM-dd}.log</fileNamePattern>      <!-- keep 30 days‘ worth of history -->      <maxHistory>30</maxHistory>    </rollingPolicy>    <encoder>      <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>    </encoder>  </appender>  <root level="info">    <appender-ref ref="STDOUT" />    <appender-ref ref="FILE" />  </root></configuration>

        <dependency>            <groupId>ch.qos.logback</groupId>            <artifactId>logback-classic</artifactId>            <version>1.0.13</version>        </dependency>