Why are the messages displayed in a different format when running an application with and without log4j in docker?

Question

Java

When I start the application normally, I get messages with the INFO level in json format, when I run it in a docker container with the same INFO level, I get regular strings. What could be the problem?
Here is the logger config file:

Configuration:
  Appenders:
    Console:
      name: Console
      JsonLayout:
        complete: true
        compact: true
        eventEol: true
      target: SYSTEM_OUT
  Loggers:
    Root:
      AppenderRef:
        - ref: Console
      level: INFO

Answer 1

in general, in Dockerfile added:
COPY src/main/resources/log4j2.yml /opt/log4j2.yml
and in CMD: "-Dlog4j.configurationFile=file:/opt/log4j2.yml"