logging.pattern.console=%clr(%d{${LOG_DATEFORMAT_PATTERN:-yyyy-MM-dd HH:mm:ss.SSS}}){faint} %clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}

/*** An {@link ApplicationListener} that configures the {@link LoggingSystem}. If the* environment contains a {@code logging.config} property it will be used to bootstrap the* logging system, otherwise a default configuration is used. Regardless, logging levels* will be customized if the environment contains {@code logging.level.*} entries and* logging groups can be defined with {@code logging.group}.* <p>* Debug and trace logging for Spring, Tomcat, Jetty and Hibernate will be enabled when* the environment contains {@code debug} or {@code trace} properties that aren't set to* {@code "false"} (i.e. if you start your application using* {@literal java -jar myapp.jar [--debug | --trace]}). If you prefer to ignore these* properties you can set {@link #setParseArgs(boolean) parseArgs} to {@code false}.* <p>* By default, log output is only written to the console. If a log file is required the* {@code logging.path} and {@code logging.file} properties can be used.* <p>* Some system properties may be set as side effects, and these can be useful if the* logging configuration supports placeholders (i.e. log4j or logback):* <ul>* <li>{@code LOG_FILE} is set to the value of path of the log file that should be written* (if any).</li>* <li>{@code PID} is set to the value of the current process ID if it can be determined.* </li>* </ul>** @author Dave Syer* @author Phillip Webb* @author Andy Wilkinson* @author Madhura Bhave* @since 2.0.0* @see LoggingSystem#get(ClassLoader)*/

private static final Map<String, List<String>> DEFAULT_GROUP_LOGGERS;static {MultiValueMap<String, String> loggers = new LinkedMultiValueMap<>();loggers.add("web", "org.springframework.core.codec");loggers.add("web", "org.springframework.http");loggers.add("web", "org.springframework.web");loggers.add("web", "org.springframework.boot.actuate.endpoint.web");loggers.add("web","org.springframework.boot.web.servlet.ServletContextInitializerBeans");loggers.add("sql", "org.springframework.jdbc.core");loggers.add("sql", "org.hibernate.SQL");DEFAULT_GROUP_LOGGERS = Collections.unmodifiableMap(loggers);}private static final Map<LogLevel, List<String>> LOG_LEVEL_LOGGERS;static {MultiValueMap<LogLevel, String> loggers = new LinkedMultiValueMap<>();loggers.add(LogLevel.DEBUG, "sql");loggers.add(LogLevel.DEBUG, "web");loggers.add(LogLevel.DEBUG, "org.springframework.boot");loggers.add(LogLevel.TRACE, "org.springframework");loggers.add(LogLevel.TRACE, "org.apache.tomcat");loggers.add(LogLevel.TRACE, "org.apache.catalina");loggers.add(LogLevel.TRACE, "org.eclipse.jetty");loggers.add(LogLevel.TRACE, "org.hibernate.tool.hbm2ddl");LOG_LEVEL_LOGGERS = Collections.unmodifiableMap(loggers);}

    @Overridepublic void onApplicationEvent(ApplicationEvent event) {if (event instanceof ApplicationStartingEvent) {onApplicationStartingEvent((ApplicationStartingEvent) event); //1}else if (event instanceof ApplicationEnvironmentPreparedEvent) {
            onApplicationEnvironmentPreparedEvent((ApplicationEnvironmentPreparedEvent) event); //2 }else if (event instanceof ApplicationPreparedEvent) {onApplicationPreparedEvent((ApplicationPreparedEvent) event); //3}else if (event instanceof ContextClosedEvent && ((ContextClosedEvent) event).getApplicationContext().getParent() == null) {onContextClosedEvent();  //4}else if (event instanceof ApplicationFailedEvent) {onApplicationFailedEvent();  //5}}

    private void onApplicationStartingEvent(ApplicationStartingEvent event) {this.loggingSystem = LoggingSystem.get(event.getSpringApplication().getClassLoader());this.loggingSystem.beforeInitialize();}

    /*** Initialize the logging system according to preferences expressed through the* {@link Environment} and the classpath.* @param environment the environment* @param classLoader the classloader*/protected void initialize(ConfigurableEnvironment environment,ClassLoader classLoader) {new LoggingSystemProperties(environment).apply();LogFile logFile = LogFile.get(environment);if (logFile != null) {logFile.applyToSystemProperties();}initializeEarlyLoggingLevel(environment);initializeSystem(environment, this.loggingSystem, logFile);initializeFinalLoggingLevels(environment, this.loggingSystem);registerShutdownHookIfNecessary(environment, this.loggingSystem);}

    private void onApplicationPreparedEvent(ApplicationPreparedEvent event) {ConfigurableListableBeanFactory beanFactory = event.getApplicationContext().getBeanFactory();if (!beanFactory.containsBean(LOGGING_SYSTEM_BEAN_NAME)) {beanFactory.registerSingleton(LOGGING_SYSTEM_BEAN_NAME, this.loggingSystem);}}

    private void onContextClosedEvent() {if (this.loggingSystem != null) {this.loggingSystem.cleanUp();}}private void onApplicationFailedEvent() {if (this.loggingSystem != null) {this.loggingSystem.cleanUp();}}

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions>
</dependency>
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j</artifactId>
</dependency>