How do I put Java onto a Ubuntu docker container?

Question

I currently have a docker container with an Ubuntu(17.10) image installed with other packages included. However, I'm currently having difficulty trying to install Java onto this container in addition to the current image.

Current Dockerfile :

FROM cityofzion/neo-privatenet
ADD files/ files/
ENTRYPOINT [ "/bin/bash" ]

When trying to find information on how to do this and testing inside of the container most suggest using this command: apt-get install -y oracle-java9-installer

However this results in:E: Unable to locate package oracle-java9-installer

I have also tried this suggested command wget http://download.java.net/java/GA/jdk9/9/binaries/jdk-9+181_linux-x64_bin.tar.gz

Which produces this result HTTP request sent, awaiting response... 404 Not Found - ERROR 404: Not Found.

I have only tried running these commands in the container, since that is how they would be run and they seem to be failing.

Can anyone suggest what I can include into my Dockerfile that install java onto my image?

Thanks in advance.

Answer 1

You can also directly pull any of the open-jdk images mentioned at (https://hub.docker.com/_/openjdk/) and use it. There is no need to install Ubuntu in docker image and then install Java on top of it. These images already use Ubuntu (with bare-minimum file system).