What is the method for deploying Java using Docker?

2 years ago
William Carter
2 minutes

To deploy a Java application in Docker, you can follow these steps:

  1. Create Dockerfile: Create a file named Dockerfile in the root directory of the project, and add the following content:
FROM openjdk:8-jdk-alpine
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
RUN javac Main.java
CMD ["java", "Main"]

“This Dockerfile utilizes a base image openjdk:8-jdk-alpine, copies the application’s code to the directory /usr/src/myapp within the container, sets the working directory to /usr/src/myapp. It then compiles the code using the javac command and runs the main class Main of the application using the java command.”

  1. Build Docker image: Navigate to the directory where the Dockerfile is located in the terminal and run the following command to build the image:
docker build -t my-java-app .

This command will build an image named my-java-app based on the Dockerfile. Note that the final “.” represents the current directory where the Dockerfile is located.

  1. To run a Docker container: Execute the following command to create and run a container based on the my-java-app image.
docker run -it --rm my-java-app

This command will start an interactive terminal and run the my-java-app container. The “–rm” option indicates that the container will be automatically deleted when it exits.

By following these steps, you can successfully deploy a Java application in Docker. Make sure your project includes all necessary dependencies and configuration files, and set them accordingly in the Dockerfile.

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