springboot logging code example

Example 1: spring logback configuration

@RestController
public class LoggingController {

    Logger logger = LoggerFactory.getLogger(LoggingController.class);

    @RequestMapping("/")
    public String index() {
        logger.trace("A TRACE Message");
        logger.debug("A DEBUG Message");
        logger.info("An INFO Message");
        logger.warn("A WARN Message");
        logger.error("An ERROR Message");

        return "Howdy! Check out the Logs to see the output...";
    }
}

Example 2: spring security logging

logging.level.org.springframework.security=DEBUG

Example 3: spring security logging

logging:
  level:
    org:
      springframework:
        security: DEBUG

Example 4: professional logging in spring boot

<?xml version="1.0" encoding="UTF-8"?><configuration>     <property name="LOGS" value="./logs" />     <appender name="Console"        class="ch.qos.logback.core.ConsoleAppender">        <layout class="ch.qos.logback.classic.PatternLayout">            <Pattern>                %black(%d{ISO8601}) %highlight(%-5level) [%blue(%t)] %yellow(%C{1.}): %msg%n%throwable            </Pattern>        </layout>    </appender>     <appender name="RollingFile"        class="ch.qos.logback.core.rolling.RollingFileAppender">        <file>${LOGS}/spring-boot-logger.log</file>        <encoder            class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">            <Pattern>%d %p %C{1.} [%t] %m%n</Pattern>        </encoder>         <rollingPolicy            class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">            <!-- rollover daily and when the file reaches 10 MegaBytes -->            <fileNamePattern>${LOGS}/archived/spring-boot-logger-%d{yyyy-MM-dd}.%i.log            </fileNamePattern>            <timeBasedFileNamingAndTriggeringPolicy                class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">                <maxFileSize>10MB</maxFileSize>            </timeBasedFileNamingAndTriggeringPolicy>        </rollingPolicy>    </appender>        <!-- LOG everything at INFO level -->    <root level="info">        <appender-ref ref="RollingFile" />        <appender-ref ref="Console" />    </root>     <!-- LOG "com.baeldung*" at TRACE level -->    <logger name="com.baeldung" level="trace" additivity="false">        <appender-ref ref="RollingFile" />        <appender-ref ref="Console" />    </logger> </configuration>