Oracle announced the availability of Java 21, the latest version of the world’s number one programming language and development platform. Java 21 (Oracle JDK 21) delivers thousands of performance, stability, and security improvements, including platform enhancements that will help developers increase productivity and drive innovation and growth across their organizations. Oracle is showcasing the latest capabilities in Java 21 at Oracle CloudWorld, which takes place this week (September 18-21) in Las Vegas.
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“Java continues to be the language and platform of choice for the development of robust, scalable, and secure applications used by organizations and millions of individuals around the world,” said Georges Saab, senior vice president of Oracle Java Platform and chair of the OpenJDK governing board. “The new enhancements in Java 21 enable developers to build better applications even faster than before. In addition, commercial support will be available for at least eight years to enable customers to migrate at their own pace.”
The latest Java Development Kit (JDK) provides updates and improvements with 15 JDK Enhancement Proposals (JEPs). JDK 21 delivers language improvements from OpenJDK project Amber (String Templates, Record Patterns, Pattern Matching for Switch, Unnamed Patterns and Variables, and Unnamed Classes and Instance Main Methods); enhancements from Project Panama (Foreign Function & Memory API and Vector API); features related to Project Loom (Virtual Threads, Scoped Values, and Structured Concurrency); performance updates (Generational ZGC); and maintenance and deprecation features (Deprecate the 32-bit x86 Port for R******, and Prepare to Disallow the Dynamic Loading of Agents).
“Despite so many languages that are in circulation, Java is still everywhere today,” said Stephen O’Grady, principal analyst and co-founder, RedMonk. “As the world evolves, Java’s ability to adapt will help it continue to play a key role in offering value to developers.”
Oracle will offer long term support for Java 21 for at least eight years. This extended support period gives organizations flexibility to keep applications in production longer with minimal maintenance, and to eventually migrate on their own terms. Based on customer feedback and use in the Java ecosystem, Oracle has also announced that long term support for Java 11 has been extended through at least January 2032, providing at least eight more years of support and updates from Oracle.
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Significant updates delivered in Java 21 are:
Project Loom Features
- JEP 444: Virtual Threads:Â Significantly streamlines the process of writing, maintaining, and observing high-throughput, concurrent applications by introducing lightweight virtual threads to the Java Platform. By enabling developers to easily troubleshoot, debug, and profile concurrent applications and scale them with existing JDK tools and techniques, virtual threads help accelerate application development.
- JEP 446: Scoped Values (Preview):Â Enables the sharing of immutable data within and across threads. This helps increase the ease-of-use, comprehensibility, robustness, and performance of developers’ projects.
- JEP 453: Structured Concurrency (Preview): Simplifies concurrent programming by introducing an API for structured concurrency, which helps promote a style of concurrent programming that can eliminate common risks arising from cancellation and shutdown – such as thread leaks and cancellation delays – and improves the observability of concurrent code. This helps developers streamline error handling and cancellation, improve reliability, and enhance observability.
Performance Updates
- JEP 439: Generational ZGC:Â Improves application performance by extending the Z Garbage Collector (ZGC) to maintain separate generations for young and old objects. Generational ZGC helps improve developer productivity by lowering the overhead of required heap memory and garbage collection CPU for applications, as well as reducing the risks of allocation stalls.
Supporting the Global Java Ecosystem with Innovation in the Cloud
Java delivers optimal performance, efficiency, and innovation when deployed in the cloud on OCI, and OCI is one of the first hyperscale clouds to support Java 21. In addition, customers gain cost savings at scale by running Java on OCI. Oracle Java SE, Oracle GraalVM, and the Java SE Subscription Enterprise Performance Pack are available free of charge on OCI, enabling developers to build and deploy applications that run faster, better, and with optimized cost-performance.
The Oracle Java Universal SE Subscription is a pay-as-you-go offering that provides customers with best-in-class support, including triage support for their entire Java portfolio, entitlement to GraalVM, the Java SE Subscription Enterprise Performance Pack, access to the advanced features of the Java Management Service, and the flexibility to upgrade at the pace of their businesses. This helps IT organizations manage complexity, contain costs, and mitigate security risks.
The Global Java Community Embraces Java 21
“Java 21 is one of the most significant releases of Java, as Virtual Threads will impact how we develop and deploy asynchronous applications, from microservices to enterprise applications,” said Dr. Venkat Subramaniam, founder, Agile Developer, Inc. “With little coding effort, developers’ applications can scale to support a large number of IO operations and service calls without placing an undue demand on resources. Increased scale at reduced costs is a big win for organizations that count on Java in production.”
“I’m excited about the ‘Unnamed Classes and Instance Main Methods’ preview feature in Java 21,” said Barry Burd, professor, Drew University. “In my intro courses, students can start quickly and easily without confusion or fanfare. In my books, I can present complete examples with no boilerplate code. And the best part is the way these new features sync with Java’s overarching design philosophy. Unnamed classes are joining their unnamed package and module cousins. And it’s backward-compatible too.”
“The sequenced collections feature in Java 21 is a great addition for the developer community. Developers no longer need to worry about accidentally relying on encounter order in a JUnit test, only to have it fail on the build server, upgrade, or elsewhere,” said Jeanne Boyarsky, Java Champion. “With sequenced collections, this order will be defined – which means no more surprises.”
Expanding Dev.java with the Java Playground and Community Contributions
Dev.java is the official site for Java developers, and today we are announcing the addition of a Java Playground as well as new community contributions to the content catalog.
The Java Playground is an online sandbox that allows users to type and run small Java code snippets without the need for a local runtime or IDE. Developers can now try out new features from Java 21 immediately, all from a browser, powered by OCI.
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