How to build and run a java instance in Docker

Question

I am trying to learn my way around Docker. I want to build a container/image for my java application. The Docker file looks like this:

FROM openjdk:7

COPY . C:/Users/name/Documents/NetBeansProjects/project1/src/mainpckg

WORKDIR C:/Users/name/Documents/NetBeansProjects/project1/src/mainpckg

RUN javac Main.java

CMD java Main

And i am calling it like this:

docker build -t my-java-app .

But it gives the following error:

$ docker build -t my-java-app .
Sending build context to Docker daemon 3.072 kB
Step 1 : FROM openjdk:7
 ---> 4a42f05dc422
Step 2 : COPY . C:/Users/name/Documents/NetBeansProjects/project1
/src/mainpckg
 ---> Using cache
 ---> 301de702fad9
Step 3 : WORKDIR C:/Users/name/Documents/NetBeansProjects/project1
s/src/mainpckg
 ---> Using cache
 ---> 1868e40b329e
Step 4 : RUN javac Main.java
 ---> Running in 66d7d769f425
javac: file not found: Main.java
Usage: javac <options> <source files>
use -help for a list of possible options
The command '/bin/sh -c javac Main.java' returned a non-zero code:
 2

I also tried the solution given here:

docker run --rm -v /mypathhere/mycode java:7 sh -c "cd mycode; javac mycode.java"

but without any results, i still got this error:

javac: file not found: Main.java
Usage: javac <options> <source files>
use -help for a list of possible options

Openjdk container is based on debian Linux distribution, I don't think C:/... is a valid path. Do you want to try it with something like /app and see if that works better? — Roman
– Roman, Commented Nov 20, 2016 at 4:30

f-society · Accepted Answer · 2016-11-20 11:07:15Z

1

There is something fishy about C:/. Try following, it must work

FROM java:8

# add the container directory from the host
RUN mkdir /opt/mainpckg

# copy the app to container directory
ADD . /opt/mainpckg

WORKDIR /opt/mainpckg

RUN javac Main.java

CMD java Main

answered Nov 20, 2016 at 11:07

f-society

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2 Comments

Angelo Uknown Over a year ago

I am confused as to what your directories are suppose to point at. If set them exactly as you have how does Docker know where to look for the Main.java?

f-society Over a year ago

@Angelo Uknown As you see in the Dockefile, you have copied all your app files from host system to docker directory /opt/mainpckg at step 3 and set this directory as your present working directory at 4th step. So you are set to issue java commands being at present working directory /opt/mainpckg where your Main.Java resides. Hope it makes more sense now.

VonC · Accepted Answer · 2016-11-19 23:52:35Z

0

I don't know why you run with -v /mypathhere/mycode, as it creates a data volume which would overlay (temporarily overwrite) anything that was /mypathhere/mycode from the Dockerfile.

So try running without the -v part, in case /mypathhere/mycode is C:/Users/name/Documents/NetBeansProjects/project1 (assuming you are using Docker on Windows with Windows containers)

answered Nov 19, 2016 at 23:52

VonC

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1 Comment

Angelo Uknown Over a year ago

Now i got the following is not a valid repository/tag.

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