Java not executable

General
1

Hi!

I’m new to Docker so I hope my question won’t sound too odd for you.

I want to create a docker image that contains a .jar-file, a downloaded jdk/jre package, a .yml-file (settings for the .jar-file) and a Dockerfile. When running the Dockerfile Docker should extract the jdk/jre package and start the java-file with certain arguments.

I’m working on Ubuntu 14.04.05, my Docker is 17.03.1-ce (API version: 1.27).

My working directory:
|
|_ Dockerfile
|_ jdk-8u131-linux-x64.tar.gz
|_ settings.yml
|_ project.jar

My Dockerfile:
FROM alpine:3.3
WORKDIR /app
ADD . /app
ENV NAME Transliteration
RUN tar -xvzf server-jre-8u131-linux-x64.tar.gz
ENV JAVA_HOME /app/jdk.1.8.0_131/
RUN ls -l /app/jdk1.8.0_131/bin
RUN /app/jdk.1.8.0_131/bin/java -version
CMD ["/app/jdk.1.8.0_131/bin/java -version"]

The error i get: /bin/sh: /app/jdk.1.8.0_131/bin/java: not found

So it seems that the java executable cannot be found, but a ls -l /app does give the correct folder structure (/app/jdk…/bin/java). What is the problem here?

2

could try to reduce the problem if you for now take a working alpine-java.

For example:
https://hub.docker.com/r/anapsix/alpine-java/

There just add your app and check if it is working.

3

Hi, think.

Thank you for your reply!

With pulling a alpine-java (or any java version, e.g. openjdk), the problem of course doesn’t occur. But for reasons of independency I want to avoid pulling a java version from any branch (because I don’t have control over what java version will be delivered). So, the core problem still exists: Why ain’t I able to start a delivered java runtime? I even used find -type f -name “java” to give the exact path during the execution of the docker image and still this path doesn’t work. To me it’s quite enigmatic.

4

you can use the working alpine-java as blueprint for your Dockerfile.
First use the original, then modify it until it exactly fits your needs.

5

Hi!

Thanks, I will try it.

6

FYI: The solution was to use the docker command “COPY” rather than “RUN cp”.

7

where did you use COPY rather than RUN cp, in the above docker file details i dont see any ‘RUN cp’ command
i am also facing same kind of issue with openjdk11.