Running docker with java permission issue

Question

I want to create a docker with java and test it, however I get an error

This is the docker file

FROM openjdk:8-jdk-slim

…



COPY  Simple.java /project/


WORKDIR /project

CMD ["java" ,”--version”]

I try to run the file Simple.java

class Simple{
    public static void main(String args[]){
        System.out.println("Hello Java");
    }
}

when I run the following command:

docker run mydocker javac Simple.java

I get the error:

Simple.java:1: error: error while writing Simple: Simple.class (Permission denied)
class Simple{
^
1 error

How could I test a simple java program and see that it works?

in your Simple.java change class name to public class Simple. — fly2matrix
– fly2matrix, Commented Sep 19, 2019 at 8:47

Bilal Ekrem Harmanşa · Accepted Answer · 2019-09-19 08:31:20Z

4

You are overriding the command(CMD) in dockerfile when you run

docker run mydocker  javac Simple.java

Here what docker doc says:

This command is optional because the person who created the IMAGE may have already provided a default COMMAND using the Dockerfile CMD instruction. As the operator (the person running a container from the image), you can override that CMD instruction just by specifying a new COMMAND

I changed your Dockerfile a bit, here:

FROM openjdk:8-jdk-slim

COPY  Simple.java /project/

WORKDIR /project

RUN ["javac" ,"Simple.java"]
CMD ["java" ,"Simple"]

Now you should be able to run

docker run mydocker

Output;

➜ DockerTest docker run mydocker
Hello Java

answered Sep 19, 2019 at 8:31

Bilal Ekrem Harmanşa

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