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I'm trying to build an alpine docker image with openjdk 11. To do so, I'm starting an alpine container:

docker run -it alpine:3.9 /bin/sh

And running the following:

export JAVA_HOME=/opt/openjdk-11 export PATH=$JAVA_HOME/bin:$PATH export JAVA_VERSION=11.0.2 export JAVA_URL=https://download.java.net/java/GA/jdk11/9/GPL/openjdk-11.0.2_linux-x64_bin.tar.gz export JAVA_SHA256=99be79935354f5c0df1ad293620ea36d13f48ec3ea870c838f20c504c9668b57 set -eux; \ \ wget -O /openjdk.tgz "$JAVA_URL"; \ echo "$JAVA_SHA256 */openjdk.tgz" | sha256sum -c -; \ mkdir -p "$JAVA_HOME"; \ tar --extract --file /openjdk.tgz --directory "$JAVA_HOME" --strip-components 1; \ rm /openjdk.tgz;

After that, I can confirm that a few things seem correct:

/ # ls -lah $JAVA_HOME/bin/java + ls -lah /opt/openjdk-11/bin/java -rwxr-xr-x 1 668 668 8.5K Jan 18 05:20 /opt/openjdk-11/bin/java / # echo $PATH + echo /opt/openjdk-11/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin /opt/openjdk-11/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin / # which java + which java /opt/openjdk-11/bin/java

But when I run java itself, I get:

/ # java -version + java -version /bin/sh: java: not found

And I get kicked out of the container. Am I missing something?

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2 Answers 2

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32

The reason you're getting java: not found is likely due to dynamic linking failure. You could verify this using ldd java.

Alpine Linux is using musl-libc for its libc (standard C library) implementation, in contrast to most other Linuxes which are using glibc, GNU's C library. As a consequence, standard Linux software that is built on non-Alpine distibutions, will usually be linked against glibc and cannot be ran on Alpine, without installing a glibc compatiblity layer. So you'll need an OpenJDK 11 Alpine build, specifically.

However, unfortunately, such build is not currently available. The OpenJDK 11 page states:

The Alpine Linux build previously available on this page was removed as of JDK 11 GA. It’s not production-ready because it hasn’t been tested thoroughly enough to be considered a GA build.

The alternatives are:

  • Installing proper glibc on the Alpine container. This is a fairly easy procedure, which will allow you to run any Linux software on Alpine. However, you won't be running "native Alpine" anymore. For installation procedure, so this post.

  • Installing non-official OpenJDK 11 Alpine from an OpenJDK vendor. Specifically, Zulu OpenJDK is a very good alternative, offering thoroughly tested and verified builds, which are free and open source as well.

Futher information is available in this StackOverflow post:
Why is the Java 11 base Docker image so large? (openjdk:11-jre-slim)

Update:

As of 2/6/19, the openjdk11 package is available in Alpine repositories! It could be grabbed from the edge/community repository with:

apk --no-cache add openjdk11 --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community
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0

Openjdk11 is available with alpine version 3.11. To install:

  1. Update version: vim /etc/apk/repositories

     bash-4.4# cat /etc/apk/repositories http://dl-cdn.alpinelinux.org/alpine/v3.11/main http://dl-cdn.alpinelinux.org/alpine/v3.11/community

  2. Upgrade: apk upgrade

  3. Get: apk add --no-cache openjdk11

     bash-4.4# java -version openjdk version "11.0.5" 2019-10-15 OpenJDK Runtime Environment (build 11.0.5+10-alpine-r0) OpenJDK 64-Bit Server VM (build 11.0.5+10-alpine-r0, mixed mode)
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