Differences between Oracle JDK and OpenJDK

The Oracle JDK (Java Development Kit) and the OpenJDK are two implementations of the Java SE (Standard Edition) platform. Both implementations include the Java runtime environment (JRE) and the Java development tools, but there are some differences between them:

1. License: Since Java 11, both Oracle JDK and OpenJDK are licensed under the GPL v2 with the Classpath Exception. The main difference is that Oracle JDK is distributed as a commercial binary, while OpenJDK is built and distributed freely by the community and third-party vendors.
2. Support: Oracle provides commercial support and long-term updates for the Oracle JDK. OpenJDK receives official long-term support (LTS) and security updates from multiple vendors and community projects, such as Adoptium (Temurin), Red Hat, Amazon Corretto, and Azul Zulu, rather than relying solely on best-effort community maintenance.
3. Features: Both distributions use the HotSpot JVM. Historically, Oracle JDK included proprietary tools like JRockit, but JRockit was merged into HotSpot years ago. Java Mission Control is now open source and fully compatible with OpenJDK. Today, differences are mostly limited to default configuration settings, bundled commercial-grade monitoring tools, and build optimizations.
4. Compatibility: Oracle JDK and OpenJDK are functionally equivalent for most applications. Minor differences may exist in default JVM flags, logging, or specific vendor-specific optimizations. For standard Java SE development, they are interchangeable.

In general, you can use either the Oracle JDK or the OpenJDK for Java development, depending on your needs and preferences. If you require official commercial support, guaranteed long-term updates, or specific vendor optimizations, you may prefer the Oracle JDK or a commercial OpenJDK distribution. If you prefer open source software, community-driven builds, or cost-free LTS releases, you may prefer the OpenJDK or alternative distributions like Adoptium (Temurin).