By Dani
Hi!
I’m on the App platform, and I try to “Create resource from source code”, and I choose my repository on GitHub, but I get a “no component detected” error.
So I looked around and found this answer saying that you should add a dockerfile. (Here:https://www.digitalocean.com/community/questions/what-are-the-possible-options-for-deploying-my-java-application-to-digitalocean)
I’m doing this for the first time. I don’t know what should go on the dockerfile or where the dockerfile should go! My app is in java, and I’m writing it on Android Studio and storing the code on GitHub.
What should the dockerfile contain? Where should I place it?
Thank you so much for any help :)
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Hey!
Indeed, Java is not a supported buildpack out of the box with the App Platform. You can find a list of all available buildpacks here:
https://docs.digitalocean.com/products/app-platform/reference/buildpacks/
As an alternative option, you could indeed write a Dockerfile with all of the required dependencies for your project and use this instead to deploy your app.
Dockerizing a Java app might differ depending on your app requirements, but it should be more or less the same as described on the Docker website itself:
The Dockerfile should be placed at the root of your backend project’s repository.
Example Dockerfile for a Java application:
# Use an official OpenJDK runtime as a parent image
FROM openjdk:17-jdk-alpine
# Set the working directory
WORKDIR /app
# Copy the jar file into the image
COPY target/my-backend-app.jar /app/my-backend-app.jar
# Expose the application's port
EXPOSE 8080
# Run the jar file
ENTRYPOINT ["java", "-jar", "/app/my-backend-app.jar"]
Hope that this helps!
Best,
Bobby
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