How to Run Your Java Project on Docker : A Step-by-Step Guide

Running your Java project in a Docker container ensures a consistent environment and simplifies deployment. In this guide, I will walk you through the process of setting up Docker for a Java project. Follow these steps to get your Java application up and running in no time!

Step 1: Clone the GitHub Repository

Start by cloning the GitHub repository containing your Java project:

git clone https://github.com/LondheShubham153/simple-java-docker.git

Step 2: Remove the Old Dockerfile

If there's an existing Dockerfile, remove it:

rm Dockerfile

Step 3: Show Main.java File

Ensure you have a Main.java file in the appropriate directory. You can use cat or less to display it:

cat javapr/src/Main.java

Adjust the path according to your project's structure.

Step 4: Create a New Dockerfile

Create a new Dockerfile using vim or any other text editor:

vim Dockerfile

Step 5: Write Docker Code

Write the following Docker code in your Dockerfile:

# OS with env
FROM openjdk:17-jdk-alpine

# Working Dir
WORKDIR /app

# Code
COPY src/Main.java /app/Main.java

# Libraries
RUN javac Main.java

#Run
CMD ["java","Main"]

Save and exit the editor (:wq in vim).

Step 6: Build the Docker Image

Build your Docker image using the following command:

docker build -t java-app .

Step 7: List Docker Images

Verify that the Docker image was created successfully:

docker images

Step 8: Run the Docker Container

Finally, run a container using the newly created Docker image:

docker run java-app:latest