Dependency
- Lombok
Log Format
Default output from Spring Boot:
2019-03-05 10:57:51.112 INFO 45469 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/7.0.52
2019-03-05 10:57:51.253 INFO 45469 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-03-05 10:57:51.253 INFO 45469 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1358 ms
2019-03-05 10:57:51.698 INFO 45469 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2019-03-05 10:57:51.702 INFO 45469 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
Notes:
- Date and Time: Millisecond precision and easily sortable.
- Log Level: ERROR, WARN, INFO, DEBUG, or TRACE.
- Process ID.
- A
---separator to distinguish the start of actual log messages. - Thread name: Enclosed in square brackets (may be truncated for console output).
- Logger name: This is usually the source class name (often abbreviated).
- The log message.
Logging Properties
Example Logging properties for change Logging level (TRACE, DEBUG, INFO, WARN, ERROR, FATAL, atau OFF):
logging.level.root=info
# spesific in some package (only Warn level will show from the package)
logging.level.nama.package.nya=warn
# e.g. loging.level.com.helmigandi=warn
File Output
logging.file.name=application.log // save in project directory
# or
logging.file.name=/var/log/application.log
# or
# automatic save in /tmp/spring.log
logging.file.path=/tmp/
File Rolling
logging.logback.rollingpolicy.max-file-size: Maximum size log file (default 10 MB).logging.logback.rollingpolicy.max-history: Maximum number of files created after reaching max files.
# about 10 files and the total size is 100 KB
logging.logback.rollingpolicy.max-file-size=10KB
logging.logback.rollingpolicy.max-history=10
Log Group
- Configure the same logging level only for multiple packages.
# logging.group.nama=package1,package2, and so forth
logging.group.warn-log=com.helmigandi.service,com.helmigandi.controller
# only warning levels will be displayed in packages `com.helmigandi.service`, and `com.helmigandi.controller`
logging.level.warn-log=warn
Bibliography
- Programmer Zaman Now. 2022. TUTORIAL SPRING LOGGING (BAHASA INDONESIA). Accessed July 16, 2022.
- Spring docs. 26. Logging. Accessed July 16, 2022.