How to run jar file in docker container?

Question

Docker

Dockerfile

FROM java:8 #Try
the same with FROM ubuntu
#RUN apt install -y openjdk-8-jdk
RUN mkdir -p /vagrant/Docker/app
WORKDIR /vagrant/Docker/app
COPY . /vagrant/Docker/app

#
EXPOSE 9000
ENV TZ Europe/Yekaterinburg
CMD ["-jar", "/vagrant/Docker/app/app.jar"]

Error with java image:
docker: Error response from daemon: OCI runtime create failed : container_linux.go:380: starting container process caused: exec: "-jar": executable file not found in $PATH: unknown.
Error with ubuntu image:
Error: Unable to access jarfile app.jar

Through the Linux command line, the file launch looks like java -jar app.jar. And what to use CMD or ENTRYPOINR for this? And what will the structure look like?

Answer 1

WORKDIRRUN mkdir -p ...- creates a directory by itself, it is not necessary to call it separately .
EXPOSE 9000you can not specify - it does nothing.

Through the Linux command line, the file launch looks like java -jar app.jar

And in the Dockerfile this command will be the same:

ENTRYPOINT ["java", "-jar", "/vagrant/Docker/app/app.jar"]