Oracle JDK and OpenJDK represent two major distributions of the Java Development Kit, and understanding their differences is crucial for Java developers to make informed choices. Here, we explore these differences from various perspectives including licensing, performance, support, and availability of updates.

1. Licensing

The most significant difference between Oracle JDK and OpenJDK lies in their licensing terms.

• Oracle JDK was free for personal use and development, but for commercial use, it required a paid license especially after Oracle changed its licensing model starting with JDK 11. This license comes with commercial support and updates. Oracle JDK was previously licensed under the Oracle Binary Code License Agreement.
• OpenJDK is open-source and freely available under the GNU General Public License v2 (with Classpath Exception). This means that it can be used, modified, and redistributed without cost for both personal and commercial use.

2. Availability of Updates

The frequency and availability of updates tie directly into the support model provided for each JDK version.

• Oracle JDK provides long-term support (LTS) releases, typically offering updates for these releases for a number of years, which is ideal for enterprises that require a stable version for an extended period. But, these updates are only available under a commercial license post the initial 6 months of release, unless it's an LTS release like JDK 11.
• OpenJDK also has similar LTS releases. However, updates are community-driven. The rapid release cadence means that a new version comes out every six months, and the community quickly moves to support the latest version. Once a version is considered obsolete, updates might become less frequent and eventually cease as focus shifts to newer versions.

3. Performance and Quality

While both JDKs originate from the same source base, performance and quality can differ slightly due to different build processes and the inclusion of alternative components.

• Oracle JDK often included proprietary performance enhancements and features like flight recorder, mission control, and various commercial features designed for better monitoring and managing usage in large-scale production environments.
• OpenJDK, in early versions, lacked some of these enhancements, but this gap has largely closed in recent years. Since Oracle has contributed most of its proprietary features into OpenJDK, the performance and quality differences have become negligible.

4. Community and Support

The level of support varies between Oracle JDK and OpenJDK, which can influence the choice of JDK.

• Oracle JDK support is provided under a paid model which includes dedicated support from Oracle, extended security updates, and performance upgrades for LTS versions.
• OpenJDK is supported by its vibrant open-source community. Free support is available through various community forums and from other OpenJDK users, but formal support might require contracting with third-parties that offer OpenJDK support (e.g., Red Hat, Amazon).

5. Use in Production

The choice between using Oracle JDK or OpenJDK in production environments often comes down to the need for stability and formal support versus the benefits of a fully open-source model that follows modern standards and community insights.

Summarized Comparison

In conclusion, while Oracle JDK was once the standard, the open-sourcing of most Oracle's proprietary features and the licensing change has led many to switch to or start with OpenJDK. OpenJDK now represents a robust, feature-complete, and widely used option in both development and production environments, aligning well with modern open-source ecosystems.