Docker container with postgres and java

Question

I would like a Docker Postgres container with Java. Here my Dockerfile:

FROM postgres AS postgres

FROM openjdk
COPY --from=postgres . .

I don't get any errors. But when I execute java -version it says

command not found

I also tried this:

FROM postgres
RUN apt-get update -y
RUN apt-get install -y oracle-java8-installer

But I get the error

Package oracle-java8-installer is not available, but is referred to by another package.

What did I do wrong? How do I accomplish this?

Answer 1

I accomplished it with following Dockerfile:

FROM postgres
RUN apt-get update -y
RUN apt-get install -y default-jre-headless