dockerfile - Dynamically set JAVA_HOME of docker container

Question

My docker container requires JAVA_HOME to be set. I have added it to the Dockerfile as below

ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/jre

However, this is a hardcoding of the value. Is there a way I can get this value dynamically from the image itself

Answer 1

Set JAVA_HOME in docker container

Default Docker file of the official image is Dockerfile

If you still want your own image with Java home set. Add this lines to your Dockerfile

RUN apt-get update && 
    apt-get install -y openjdk-8-jdk && 
    apt-get install -y ant && 
    apt-get clean && 
    rm -rf /var/lib/apt/lists/ && 
    rm -rf /var/cache/oracle-jdk8-installer;

ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/
RUN export JAVA_HOME