How to Configure Simple Logger slf4j Log Levels

Hi all, if you use slf4j-simple in your projects, you may be faced with default log reporting and if you don’t want to see especially INFO level logs in your console, you need to modify logging levels. There are some ways to do this operation but in this article, I want to explain how to configure Simple Logger SLF4J’s log levels.

In order to do this, you need to create a new properties file in your test resources folder and name it as simplelogger.properties. After that, you should add below properties configurations in this file.

# SLF4J's SimpleLogger configuration file
# Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to System.err.

# Default logging detail level for all instances of SimpleLogger.
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, defaults to "info".
#org.slf4j.simpleLogger.defaultLogLevel=info

# Logging detail level for a SimpleLogger instance named "xxxxx".
# Must be one of ("trace", "debug", "info", "warn", or "error").
# If not specified, the default logging detail level is used.
#org.slf4j.simpleLogger.log.xxxxx=

# Set to true if you want the current date and time to be included in output messages.
# Default is false, and will output the number of milliseconds elapsed since startup.
#org.slf4j.simpleLogger.showDateTime=false

# The date and time format to be used in the output messages.
# The pattern describing the date and time format is the same that is used in java.text.SimpleDateFormat.
# If the format is not specified or is invalid, the default format is used.
# The default format is yyyy-MM-dd HH:mm:ss:SSS Z.
#org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd HH:mm:ss:SSS Z

# Set to true if you want to output the current thread name.
# Defaults to true.
#org.slf4j.simpleLogger.showThreadName=true

# Set to true if you want the Logger instance name to be included in output messages.
# Defaults to true.
#org.slf4j.simpleLogger.showLogName=true

# Set to true if you want the last component of the name to be included in output messages.
# Defaults to false.
#org.slf4j.simpleLogger.showShortLogName=false

After adding this file, you can uncomment the properties which you want to modify as shown and commented in below file. For example, if I use “org.slf4j.simpleLogger.defaultLogLevel=warn” then I will not see debug and info logs on the console.

I hope this tip will help you. If you know better ways, please write a comment below of this article.

Thanks.
Onur Baskirt