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You also need to check your running parameters, especially the classpath parameter, whether the configuration file outside the package is included in the classpath.

1. Check the output level of LOG in the configuration file
2. Check the Logger code in the code to see if it matches the output level

According to the suggestion of the hero below (fabricated belief), the problem was finally solved successfully. Below, record the detailed steps to solve the problem:
First, find the MANIFEST.MF file in the jar package and find the Main-Class of the file Method:

Execute the following command:

java.exe -cp .;gf-mfile.jar org.springframework.boot.loader.JarLauncher

There is information in the log file.

=========Appendix, java -cp command analysis===============
java -cp .;c:dir1lib.jar Test

-cp is the same as -classpath. It is the path of other classes that the specified class depends on to run, usually a class library, jar package, etc. It needs the full path to the jar package, and the semicolon ";" on the window

Separated by semicolon ":" on Linux. Wildcards are not supported. All jar packages need to be listed, using a dot "." to represent the current path.
Although there are now IDEs such as eclipse, sometimes some programs are compiled and run manually. Many people, including people with many years of development experience, do not know how to parameterize running classes on the command line. A bit unreliable...
Usage example:
java -cp ..libhsqldb.jar org.hsqldb.Server -database mydb
or
java -cp ../lib/hsqldb.jar org.hsqldb.Server -database.0 mydb -dbname.0 mydb