1. Before java run execute jar, you need create a execute jar.
2. In src, create a file name manifest.mf
   Manifest-version: 1.0
   Main-Class: Main
3. Dockerfile
   FROM eclipse-temurin:17.0.5_8-jdk-ubi9-minimal AS build
   WORKDIR /tmp/app
   COPY src /tmp/app/src
   RUN mkdir -p /tmp/out
   RUN javac -d /tmp/out src/.java
   RUN cp /tmp/app/src/manifest.mf /tmp/out/manifest.mf
   RUN ls /tmp/out/
   RUN cd /tmp/out/ && jar cfm /tmp/app/app.jar manifest.mf Main.class Player.class VARIANTS.class
   FROM eclipse-temurin:17.0.5_8-jre-ubi9-minimal
   WORKDIR /APP
   COPY --from=build /tmp/app/app.jar /APP/app.jar
   ENTRYPOINT ["java", "-jar", "app.jar"]
4. build command
   docker build -t taskone:1.0.0 . docker tag taskone:1.0.0 taskone:latest
5. run command
   docker run -it taskone
6. check image command
   docker images | grep taskone
7. Package class to jar
   jar cfm /tmp/app/app.jar manifest.mf Main.class Player.class VARIANTS.class
8. If you package your class to jar in host, you don't need multi stage build. Just copy host jar file.
   Dockerfile

FROM eclipse-temurin:17.0.5_8-jre-ubi9-minimal
WORKDIR /APP
COPY app.jar /APP/app.jar
ENTRYPOINT ["java", "-jar", "app.jar"]

I already test OK in my machine.