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Since it’s rare for Java applications to be developed using only the standard library, you most likely need to also add 3rd party Java libraries.
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In particular, you can use OpenJDK in proprietary software without disclosing your code.īefore using Oracle’s JDK/JRE, please read the following post: “ Running Java on Docker? You’re Breaking the Law.”
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This license allows using OpenJDK with any software license, not just the GPL.
The Classpath Exception part is important. OpenJDK is licensed under GPL with Classpath Exception. It includes an implementation of the Java Virtual Machine ( JVM) with an implementation of the Java Class Library. JRE is a software package, that has everything required to run a Java program. It starts with a Java Runtime Environment ( JRE). Since Docker containers are just isolated processes, your Java Docker image should only contain the files required to run your application. Dockerizing a Java application What files need to be included in a Java Application’s Docker image? You should also understand that using Docker is actually two completely different and unrelated things: Using Docker as a deployment artifact and using docker in a CI/CD pipeline in order to package all the build tools needed by an application. Docker isn’t so complex than any developer shouldn’t be able to understand how it works. If you’re new to Docker, I suggest reading this Understanding Docker article. Trying to reuse VM practices on Docker containers is actually the number 1 Docker anti-pattern that I see in companies trying to adopt docker.
Docker is even better than a child process because it allows better isolation and environmental control. The files and packages needed for an entire VM are different from those needed by just another process running a dev machine. Instead, think of Docker as a “child process”. Make yourself a favor and do not follow these tutorials! What should you know about Docker?ĭevelopers new to Docker are often tempted to think of it as just another VM. Following these tutorials, you will get huge Docker images and long build times.įor the current demo project, the first two tutorials took around 15 minutes to build (first build) and produced images of 1.3GB size each. These are examples of not so good tutorials. There are plenty of “Docker for Java developers” tutorials out there, that unintentionally encourage some Docker bad practices.
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To follow along, please create a free Codefresh account by adding one of your repos, and start building, testing and deploying Docker images instantly. Spoiler alert, it’s gonna be a long article.
In this post, I will show you how to create an effective Java-Docker build pipeline to consistently produce small, efficient, and secure Docker images. Whatever reason, if you have to marry Java with Docker, you better do it properly. Maybe Java is your favorite language and you do not want to learn a new one, or you have a legacy codebase that you need to maintain, or your company decided on Java and you have no other option. Despite that fact, I don’t think Java is usually the right choice for microservices.īut, sometimes you have to work with Java.
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It was a long love–hate relationship.ĭuring my work career, I wrote a lot of code in Java. I started working with Java in 1998, and for a long time, it was my main programming language. The recipe: Create a separate Docker image for each step and optimize the way you are running it. What is the bare minimum you need to build, test and run your Java application in Docker container?
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