SLF4J with Logback - SirajChaudhary/comprehensive-example-on-microservices-using-spring-boot-with-spring-cloud GitHub Wiki

SLF4J with Logback (Faccade Design Pattern)

• SLF4J, Logback are part of spring-boot-starter-web dependency.
• Spring Boot supports different logging providers such as Java Util Logging, Log4j2 and Logback based on configuration provided
• Logback is default logging framework for spring boot.
• Logback herarchy levels are ALL -> TRACE -> DEBUG -> INFO -> WARN -> ERROR -> FATAL -> OFF
• We'll use SLF4J with Logback implementation (Faccade Design Pattern).

Step1: Add Logback logging properties in applicaiton.yml

# If we don't define following properties it picks default properties i.e. logging.level=info
logging:
  level:
    root: DEBUG
    # LOGGING FOR SPECIFIC PACKAGE
    com:
      airport:
        checkin:
          controller: TRACE
  pattern:
    # console: '"%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"'
    file: '"%d{yyyy-MM-dd HH:mm:ss} - %msg%n"'
  file:
    name: src/main/resources/logs/checkin-service-logfile.log
    max-size: 10MB
    clean-history-on-start: 'true'

Step2: Log the logs using SLF4J APIs. Example