Configuring a rolling file log (logback) to create a log file every hour and splitting log files if they are more than 4 MB in size.

AppConfig.java

package com.sbytestream.sample;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan("com.sbytestream.sample")
public class AppConfig {
}

Application.java

package com.sbytestream.sample;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application implements CommandLineRunner {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void run(String[] args) {
        log.info("Application is running...");
    }

    private static final Logger log = LoggerFactory.getLogger(Application.class);
}

application.properties

logging.level.com.sparkathon.Application=INFO

logback-spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <property resource="application.properties" />
    <include resource="org/springframework/boot/logging/logback/defaults.xml" />
    <include resource="org/springframework/boot/logging/logback/file-appender.xml" />
    <include resource="org/springframework/boot/logging/logback/console-appender.xml" />
    <!--
    <property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${LOG_TEMP:-${java.io.tmpdir:-/tmp}}/}loganalyzer.log}" />
    -->
    <property name="LOG_FILE" value="d:/temp/loganalyzer" />

    <appender name="ROLLING_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${LOG_FILE}.log</File>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <Pattern>
                %d{dd-MM-yyyy HH:mm:ss.SSS} [%thread] %-5level %logger{36}.%M - %msg%n
            </Pattern>
        </encoder>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_FILE}-%d{yyyy-MM-dd-HH}.%i.log</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>4MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <maxHistory>100</maxHistory>
            <totalSizeCap>1000MB</totalSizeCap>
        </rollingPolicy>
    </appender>

    <root level="INFO">
        <appender-ref ref="ROLLING_LOG" />
        <appender-ref ref="CONSOLE" />
    </root>
</configuration>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>LogAnalyzer</artifactId>
    <version>1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version>
    </parent>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>6</source>
                    <target>6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
    </dependencies>
</project>