如何使用Docker运行简单的Java文件

Question

I am extremely new to the world of docker. I am trying to learn on the most basic example in Java. I have a project folder called docker-java, and a Dockerfile inside along with a Hello.java file that souts out hello. I am trying to build the image so I may run it and see the output in the terminal. Here is my dockerfile. I am being told Hello.java can not be found.

FROM java

RUN javac Hello.java

CMD java Hello

Answer 1

Add following code to copy your Hello.java (I assume the java file is in the same folder as your dockerfile)

FROM java

RUN mkdir -p /usr/src/your_workdir

WORKDIR /usr/src/your_workdir

COPY Hello.java ./

RUN javac Hello.java

CMD java Hello

You basicly have to copy your java file into your container. It is also recommended to create a personal workdir to avoid possible conflict with native files.