terms of settlement:

on the command line, enter
Yum install fontconfig to add a sentence in the dockerfile (just add it in the line before entrypoint)
Run APK add -- update font-adobe-100dpi TTF dejavu fontconfig restart or rebuild

Reason:
the openjdk used in the docker container is different from the local JDK, so the null pointer error of the font will be reported. If the font is useful, you can try it