Choosing a JDK Distribution: Oracle, OpenJDK, and Others
What you'll learn: You'll understand the different JDK distributions available and how to pick the right one for learning and development.
Why Multiple JDK Distributions Exist
Think of the JDK like a recipe for baking bread. Oracle created the original recipe, but now many bakeries (vendors) follow that same recipe with slight variations in packaging and support. All produce essentially the same "bread" (Java code runs the same way), but they differ in licensing, support, and minor extras.
The Main Options
Oracle JDK – The original from Oracle Corporation. It requires a paid license for production use in some cases, but is free for learning and development. It comes with commercial support options.
OpenJDK – The completely free, open-source version that Oracle JDK is based on. Think of it as the community edition. No licensing fees, ever.
Adoptium (formerly AdoptOpenJDK) – A popular, free distribution of OpenJDK backed by the Eclipse Foundation. It's well-tested, frequently updated, and trusted by many developers.
Amazon Corretto – Amazon's free, production-ready distribution of OpenJDK with long-term support. Used internally by Amazon for their services.
Which Should You Choose?
For beginners, Adoptium or Amazon Corretto are excellent choices. They're:
- Completely free
- Easy to install
- Regularly updated
- Fully compatible with standard Java
Oracle JDK and plain OpenJDK work great too, but Adoptium and Corretto provide clearer update paths and easier installation processes.
The Bottom Line
All these distributions run the same Java code. The differences matter more for companies deploying applications than for learners. Pick any reputable distribution—you can always switch later without rewriting your code.
Key Takeaway: Multiple vendors offer JDK distributions based on the same Java specification; for beginners, Adoptium or Amazon Corretto provide free, hassle-free options that work identically to Oracle's version.