Installing Java on docker in docker image

Question

I want to install the openjdk on the docker in docker image. When I try this is get this error message:

fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/main/x86_64/APKINDEX.tar.gz fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/community ERROR: unsatisfiable constraints: openjdk8-8.121.13-r0: breaks: world[openjdk8=8.111.14-r0] The command '/bin/sh -c set -x && apk add --no-cache openjdk8="$JAVA_ALPINE_VERSION" && [ "$JAVA_HOME" = "$(docker-java-home)" ]' returned a non-zero code: 1 

My Dockerfile currently looks like this:

FROM docker:latest RUN apk update ENV LANG C.UTF-8 RUN { \ echo '#!/bin/sh'; \ echo 'set -e'; \ echo; \ echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \ } > /usr/local/bin/docker-java-home \ && chmod +x /usr/local/bin/docker-java-home ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin ENV JAVA_VERSION 8u111 ENV JAVA_ALPINE_VERSION 8.111.14-r0 RUN set -x \ && apk add --no-cache \ openjdk8="$JAVA_ALPINE_VERSION" \ && [ "$JAVA_HOME" = "$(docker-java-home)" ] 

Answer 1

There's a Dockerfile reference on how official Java image is baking on top of alpine image: https://github.com/docker-library/openjdk/blob/9a0822673dffd3e5ba66f18a8547aa60faed6d08/8-jdk/alpine/Dockerfile

Or you could do it another way around,

# build ontop of official Java image FROM java:openjdk-8-jdk-alpine RUN apk update && \ apk add docker ... 

Answer 2

Well as @user2105103 mentioned this is a problem with JDK version.

You could simply skip the version and problem will disappear. Example:

FROM docker:latest # Default to UTF-8 file.encoding ENV LANG C.UTF-8 # add a simple script that can auto-detect the appropriate JAVA_HOME value # based on whether the JDK or only the JRE is installed RUN { \ echo '#!/bin/sh'; \ echo 'set -e'; \ echo; \ echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \ } > /usr/local/bin/docker-java-home \ && chmod +x /usr/local/bin/docker-java-home ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin ENV JAVA_VERSION 8u111 ENV JAVA_ALPINE_VERSION 8.111.14-r0 RUN set -x && apk add --no-cache openjdk8 && [ "$JAVA_HOME" = "$(docker-java-home)" ] 

In this case you will get the latest JDK version. Hope it helps.