1. Compile Scala and Create a Jar File

Just follow the instuction here then you can create a jar file: https://stackoverflow.com/questions/1082580/how-to-build-jars-from-intellij-properly

Note that if you are using Maven, set META-INF directory under main/resources folder instead of main/java. Refer the link: https://intellij-support.jetbrains.com/hc/en-us/community/posts/206872335-How-to-create-executable-JAR-using-Intellij-

2. Run Docker Container with Java 8

Here is the official repository for OpenJDK docker image.
https://hub.docker.com/_/openjdk/

You can pull the docker image to your local repository.

docker pull openjdk:latest

Then, run a new container from the image.

[root@sunny ~]# docker run -it openjdk:latest bash;
root@6c5fbb0f16c3:/#

Check the version of Java

root@6c5fbb0f16c3:/# java -version
openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-8u141-b15-1~deb9u1-b15)
OpenJDK 64-Bit Server VM (build 25.141-b15, mixed mode)

Also, you can check the status of running docker containers with docker ps command.

[root@sunny ~]# docker ps
CONTAINER ID        IMAGE                                                                                      COMMAND             CREATED             STATUS              PORTS               NAMES
6c5fbb0f16c3        openjdk:latest                                                                             "bash"              17 minutes ago      Up 17 minutes

3. Run Jar Application on Container

You can copy files in the docker host onto a docker conainer using docker cp command: https://docs.docker.com/engine/reference/commandline/cp/

[root@sunny ~]# docker cp ./test.jar 6c5fbb0f16c3:/home/test.jar

Finally, run the jar as usual.
(I used an app which send get request to Isilon REST API for the test.)

root@6c5fbb0f16c3:/# java -jar /home/test.jar
Sending HTTP Request to https://10.32.2.26:4088/platform/3/statistics/summary/drive
_platform_3_statistics_summary_drive