Spring Boot How can I set the logging level with application properties

Question

This is very simple question  but I cannot find information   Maybe my knowledge about Java frameworks is severely lacking   How can I set the logging level with application properties  And logging file location  etc

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You can do that using your application properties   logging level  ERROR -  Sets the root logging level to error     logging level  DEBUG -  Sets the root logging level to DEBUG  logging file   java io tmpdir  myapp log -  Sets the absolute log file path to TMPDIR myapp log  A sane default set of application properties regarding logging using profiles would be  application properties   spring application name  lt your app name here gt  logging level  ERROR logging file   java io tmpdir    spring application name  log   application-dev properties   logging level  DEBUG logging file    When you develop inside your favourite IDE you just add a -Dspring profiles active dev as VM argument to the run debug configuration of your app   This will give you error only logging in production and debug logging during development WITHOUT writing the output to a log file  This will improve the performance during development   and save SSD drives some hours of operation

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In my current config I have it defined in application yaml like that   logging    level      ROOT  TRACE   I am using spring-boot 2 2 0 RELEASE  You can define any package which should have the TRACE level like that

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In case you want to use a different logging framework  log4j for example  I found the easiest approach is to disable spring boots own logging and implement your own  That way I can configure every loglevel within one file  log4j xml  in my case  that is     To achieve this you simply have to add those lines to your pom xml     lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-web lt  artifactId gt   lt  dependency gt    lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter lt  artifactId gt       lt exclusions gt           lt exclusion gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-logging lt  artifactId gt           lt  exclusion gt       lt  exclusions gt   lt  dependency gt   lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-log4j lt  artifactId gt   lt  dependency gt    You probably already have the first dependency and only need the other two  Please note  that this example only covers log4j  That s all  now you re all set to configure logging for boot within your log4j config file

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Suppose your application has package name as com company myproject  Then you can set the logging level for classes inside your project as given below in application properties files     logging level com company myproject   DEBUG   logging level org springframework web   DEBUG and logging level org hibernate   DEBUG will set logging level for classes of Spring framework web and Hibernate only   For setting the logging file location use      logging file    home ubuntu myproject log

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If you are on Spring Boot then you can directly add following properties in application properties file to set logging level   customize logging pattern and to store logs in the external file    These are different logging levels and its order from minimum  lt  lt  maximum   OFF  lt  lt  FATAL  lt  lt  ERROR  lt  lt  WARN  lt  lt  INFO  lt  lt  DEBUG  lt  lt  TRACE  lt  lt  ALL    To set logs level as per your need  logging level org springframework   debug logging level tech hardik   trace    To store logs to external file   Here use strictly forward     slash for both Windows  Linux or any other os  otherwise  its won t work        logging file D  spring app log file log    To customize logging pattern  logging pattern file    d yyyy-MM-dd HH mm ss  -  msg n    Please pass through this link to customize your log more vividly   https   docs spring io spring-boot docs current reference html boot-features-logging html

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in spring boot project we can write logging level root WARN but here problem is  we have to restart again even we added devtools dependency  in property file if we are modified any value will not autodetectable  for this limitation i came to know the solution i e we can add actuator in pom xml and pass the logger level as below shown in postman client in url bar http   localhost 8080 loggers ROOT or  http   localhost 8080 loggers com mycompany and in the body you can pass the json format like below       configuredLevel    WARN

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For the records  the official documentation  as for Spring Boot v1 2 0 RELEASE and Spring v4 1 3 RELEASE      If the only change you need to make to logging is to set the levels of various loggers then you can do that in application properties using the  logging level  prefix  e g            logging level org springframework web  DEBUG        logging level org hibernate  ERROR         You can also set the location of a file to log to  in addition to the console  using  logging file        To configure the more fine-grained settings of a logging system you need to use the native configuration format supported by the LoggingSystem in question  By default Spring Boot picks up the native configuration from its default location for the system  e g  classpath logback xml for Logback   but you can set the location of the config file using the  logging config  property

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Existing answers are greats  I just want to share with you a new spring boot feature allowing to group logs and set logging level on the whole group   Exemple from the docs     Create a logging group   logging group tomcat org apache catalina  org apache coyote  org apache tomcat    Set the logging level for group   logging level tomcat TRACE   It s nice feature which brings more flexibility

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The proper way to set the root logging level is using the property logging level root  See documentation  which has been updated since this question was originally asked   Example   logging level root WARN

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Update  Starting with Spring Boot v1 2 0 RELEASE  the settings in application properties or application yml do apply  See the Log Levels section of the reference guide  logging level org springframework web  DEBUG logging level org hibernate  ERROR  For earlier versions of Spring Boot you cannot  You simply have to use the normal configuration for your logging framework  log4j  logback  for that  Add the appropriate config file  log4j xml or logback xml  to the src main resources directory and configure to your liking  You can enable debug logging by specifying --debug when starting the application from the command-line  Spring Boot provides also a nice starting point for logback to configure some defaults  coloring etc  the base xml file which you can simply include in your logback xml file   This is also recommended from the default logback xml in Spring Boot   lt include resource  quot org springframework boot logging logback base xml quot   gt

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Making sure Dave Syer tip gets some love  because adding debug true to application properties will indeed enable debug logging

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If you want to set more detail  please add a log config file name  logback xml  or  logback-spring xml    in your application properties file  input like this   logging config  classpath logback-spring xml   in the loback-spring xml  input like this        lt  xml version  1 0  encoding  UTF-8   gt       lt configuration gt           lt include resource  org springframework boot logging logback base xml   gt            lt appender name  ROOT APPENDER  class  ch qos logback core rolling RollingFileAppender  gt                lt filter class  ch qos logback classic filter LevelFilter  gt                   lt level gt INFO lt  level gt                   lt onMatch gt ACCEPT lt  onMatch gt                   lt onMismatch gt DENY lt  onMismatch gt               lt  filter gt                lt file gt sys log lt  file gt                lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt                     lt fileNamePattern gt   LOG DIR    SYSTEM NAME  system  d yyyy-MM-dd   i log lt  fileNamePattern gt                    lt timeBasedFileNamingAndTriggeringPolicy class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt                       lt maxFileSize gt 500MB lt  maxFileSize gt                   lt  timeBasedFileNamingAndTriggeringPolicy gt               lt  rollingPolicy gt                lt encoder gt                   lt pattern gt  -20  d yyy-MM-dd HH mm ss SSS    X requestId     -5level -  logger 80  -  msg n                  lt  pattern gt               lt  encoder gt           lt  appender gt             lt appender name  BUSINESS APPENDER  class  ch qos logback core rolling RollingFileAppender  gt               lt filter class  ch qos logback classic filter LevelFilter  gt                   lt level gt TRACE lt  level gt                   lt onMatch gt ACCEPT lt  onMatch gt                   lt onMismatch gt DENY lt  onMismatch gt               lt  filter gt                lt file gt business log lt  file gt                lt rollingPolicy class  ch qos logback core rolling TimeBasedRollingPolicy  gt                    lt fileNamePattern gt   LOG DIR    SYSTEM NAME  business  d yyyy-MM-dd   i log lt  fileNamePattern gt                    lt timeBasedFileNamingAndTriggeringPolicy class  ch qos logback core rolling SizeAndTimeBasedFNATP  gt                       lt maxFileSize gt 500MB lt  maxFileSize gt                   lt  timeBasedFileNamingAndTriggeringPolicy gt               lt  rollingPolicy gt                lt encoder gt                   lt pattern gt  -20  d yyy-MM-dd HH mm ss SSS    X requestId     -5level -  logger 80  -  msg n                  lt  pattern gt               lt  encoder gt           lt  appender gt             lt logger name   project-package-name   level  TRACE  gt               lt appender-ref ref  BUSINESS APPENDER    gt           lt  logger gt            lt root level  INFO  gt               lt appender-ref ref  ROOT APPENDER    gt           lt  root gt        lt  configuration gt

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In case of eclipse IDE and your project is maven  remember to clean and build the project to reflect the changes

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With Springboot 2 you can set the root logging Level with an Environment Variable like this   logging level root DEBUG   Or you can set specific logging for packages like this   logging level my package name TRACE

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You can try setting the log level to DEBUG it will show everything while starting the application  logging level root DEBUG

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