CODEWITHSUNDEEP
javadocker
Ayan Biswas
Ayan Biswas

Reputation: 1635

javac: File Not Found Error in Dockerfile

I am trying to build a docker image for a java app. I have done the following in the dockerfile :

FROM java:8
RUN javac HelloDocker.java
CMD ["java","HelloDocker"]

When I am trying to build the image it is throwing the following exception :javac: file not found: HelloDocker.java The HelloDocker.java file and Dockerfile is in the same directory. Also, when I tried to compile the java file separately (via javac HelloDocker.java), it did not throw any error.

Upvotes: 2

Views: 5312

Answers (2)

Tapan Halani
Tapan Halani

Reputation: 334

Assuming this is the complete Dockerfile, you need to have a file named HelloDocker.java in your docker image's file system, before you can compile the file using "RUN javac HelloDocker.java" . You may copy the file from your host's file system to you docker image using docker COPY/ADD command.

Upvotes: 2

Tarun Lalwani
Tarun Lalwani

Reputation: 146510

You are using a deprecated image. You should be using openjdk image. See the below

https://hub.docker.com/_/openjdk/

Also you need javac so you should be using the one with jdk tag and not the jre tag.

So try openjdk:8-jdk

Edit-1

Also you need to copy the files inside your Dockerfile. When you use docker build ., then the current directory files as available to you as context but they are not inside image

FROM java:8
WORKDIR /app
COPY HelloDocker.java .
RUN javac HelloDocker.java
CMD ["java","HelloDocker"]

Upvotes: 2

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