问题
I have a dockerfile that starts with the following line
FROM java:8
I thought this is supposed to pull the image from the docker container registry and install. no?
when I run the java command inside my container I get the following error
ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
What is the easiest and the best way to install java 8(openjdk version) using docker?
UPDATE:
RUN apt-get install -y --no-install-recommends software-properties-common
RUN add-apt-repository -y ppa:openjdk-r/ppa
RUN apt-get update
RUN apt-get install -y openjdk-8-jdk
RUN apt-get install -y openjdk-8-jre
RUN update-alternatives --config java
RUN update-alternatives --config javac
回答1:
Perhaps you're missing something.
8 tag or 8-jdk are working fine:
$ docker run -ti java:8-jdk
root@ea4ae4cf642e:/# echo $JAVA_HOME
/usr/lib/jvm/java-8-openjdk-amd64
You can also verify by looking at the Dockerfile and see that it indeed defines JAVA_HOME. For example, see java:8 Dockerfile
Also, The simplest form of Dockerfile will, of course, evaluate to the same result. i.e:
FROM java:8-jdk
CMD ["/bin/bash"]
And building in the following way:
$ docker build -t myjava .
Then, executing it:
$ docker run -ti myjava:latest bash
root@3c35f7d2d94a:/# echo $JAVA_HOME
/usr/lib/jvm/java-8-openjdk-amd64
来源：https://stackoverflow.com/questions/36587850/best-way-to-install-java-8-using-docker