springboot logging.config=classpath:log4j2.xml -Dlogging.config=config/log4j2.xml

application.properties

logging.config=classpath:log4j2.xml

logging.file.max-size=50MB
logging.level.com.exampl.springkafkademp=debug
logging.file.max-history=7
logging.file.path=logs

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application.yml

spring:
  application:
    name: xxx
logging:
  config: file:config/log4j2.xml

-Dlogging.config=config/log4j2.xml

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