How to change log level in a spring boot project(in production enviroment) by change any property in application properties if I am using log4j2

Question

I am developing a spring boot service (2.1.7 spring boot version) where I am using log4j2 to establish the logs and their pattern:

    <?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" name="MyService">
    <Properties>
        <Property name="project.component">${bundle:bootstrap:project.component}</Property>
        <Property name="project.version">${bundle:bootstrap:project.version}</Property>
    </Properties>
    <Appenders>
        <Console name="main" target="SYSTEM_OUT">
            <PatternLayout
              pattern="%d{yyyy-MM-dd HH:mm:ss,SSSZ} ${project.component} ${project.version} - %msg%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Logger name="root" level="INFO">
            <AppenderRef ref="main" level="INFO"/>
        </Logger>
    </Loggers>
</Configuration>

I am not using log4j2.properties. My problem is that I am only able to change the log level by log4j2.xml, I have tried with several spring boot properties in my application.properties as logging.level.root or through actuator endpoints but they did not work. When I am in a production environment and I need to change the logs level I have not a way to do it.

Any suggestion?

Check this https://stackoverflow.com/questions/20485059/spring-boot-how-can-i-set-the-logging-level-with-application-properties — rock11, Nov 19 '19 at 11:19
@rock11 this StackOverflow question is valid for spring boot 1.x. It stopped working when I updated my application. — Maria Montenegro, Nov 19 '19 at 13:53
@MariaMontenegro the comments in this answer seem to mention it working even in v4.1.3 Release.Check that comment once. — rock11, Nov 20 '19 at 05:59
Yes it said "As for Spring v4.1.3.RELEASE (with Spring Boot v1.2.0.RELEASE)" I am using spring boot v.2.1.3(with spring framework 5.0) — Maria Montenegro, Nov 20 '19 at 07:45

score 0 · Answer 1 · answered Nov 20 '19 at 08:06

I am able to change the log level using a similar configuration, which even let's you configure a pattern for the log:

# Set everything to be logged to the console
log4j.rootCategory=TRACE, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n

Per-class log levels can also be set, in example:

# Settings to quiet third party logs that are too verbose
log4j.logger.org.eclipse.jetty=WARN
log4j.logger.org.eclipse.jetty.util.component.AbstractLifeCycle=ERROR
log4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFO
log4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INF
log4j.logger.org.apache.spark.sql.execution.streaming.FileStreamSource=TRACE

How to change log level in a spring boot project(in production enviroment) by change any property in application properties if I am using log4j2

1 Answers1