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Oracle announces Java 18

The latest Java Development Kit (JDK) provides updates and improvements with nine JDK Enhancement Proposals (JEPs).

Oracle announced the availability of Java 18, the latest version of the world’s number one programming language and development platform. Java 18 (Oracle JDK 18) delivers thousands of performance, stability, and security improvements, including nine enhancements to the platform that will further improve developer productivity.

The latest Java Development Kit (JDK) provides updates and improvements with nine JDK Enhancement Proposals (JEPs). These include the capability to add Code Snippets in Java API Documentation (JEP 413), which simplifies the addition of sample source code in API documentation, and Simple Web Server (JEP 408) for prototyping and testing. Developers can explore two incubating modules: the Vector API (JEP 417) and the Foreign Function and Memory API (JEP 419), as well as a preview feature: Pattern Matching for Switch (JEP 420).

“The release of Java 18 demonstrates Oracle’s continued commitment to provide enterprises and developers faster access to enhancements with the six-month feature release cadence,” said Georges Saab, Vice President of Development, Java Platform Group, Oracle. “We continue to make technical investments that improve the performance, stability, and security of the Java SE Platform implementations, as well as the Java Development Kit.”

“Java developers want continued innovation with modern programming language features, developer experience enhancements, cloud managed services, and stability,” said James Governor, Principal Analyst, RedMonk. “With Java’s consistent six-month release cadence Oracle is meeting those demands, helping to keep Java relevant for modern applications and workloads.”

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Accelerating Javas Adoption in the Cloud

Oracle recently introduced Java Management Service (JMS), a new Oracle Cloud Infrastructure (OCI) native service to help manage Java runtimes and applications on-premises or on any cloud. JMS delivers the information needed to manage Java deployments across the enterprise. Java Management Service is included for OCI workloads and for Java SE Subscribers.

Java 18 is the latest release under Java’s six-month release cadence and is the result of extensive collaboration between Oracle engineers and other members of the worldwide Java developer community via the OpenJDK Project and the Java Community Process (JCP). This provides a steady stream of innovations while also delivering continued performance, stability and security improvements that will increase Java’s pervasiveness across organizations and industries of all sizes. The largest changes delivered in Java 18 are:

Updates and Improvements to Libraries

·        JEP 400: UTF-8 by Default—Sets UTF-8 as the default charset of the standard Java APIs. With this change, APIs that depend on the default charset will behave consistently across all implementations, operating systems, locales, and configurations.

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·        JEP 408: Simple Web ServerA command-line tool and API to start a minimal web server that serves static files only. This tool will be useful for prototyping, ad-hoc coding, and testing purposes, particularly in educational contexts.

·        JEP 416: Reimplement Core Reflection with Method HandlesReimplements java.lang.reflect.Method, Constructor, and Field on top of java.lang.invoke method handles. By making method handles the underlying mechanism for reflection, it reduces the maintenance and development cost of both the java.lang.reflect and java.lang.invoke APIs.

·        JEP 418: Internet-Address Resolution SPIDefines a service-provider interface (SPI) for host name and address resolution, so that java.net.InetAddress can make use of resolvers other than the platform’s built-in resolver.

Tools

·        JEP 413: JEP Code Snippets in Java API DocumentationIntroduces the @snippet tag for JavaDoc’s Standard Doclet to simplify the inclusion of example source code in API documentation.

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Preview and Incubators for Later JDK Releases

·        JEP 417: Vector API (Third Incubator)Provides an API for developers to reliably leverage CPU architectures that provide scalable vector extensions.  This will lead to superior performance compared to equivalent computations on non-extended processors.

·        JEP 419: Foreign Function and Memory API (Second Incubator)Enables Java programs to interoperate with code and data outside of the Java runtime. By efficiently invoking foreign functions (i.e., code outside the JVM), and by safely accessing foreign memory (i.e., memory not managed by the JVM), the API enables Java programs to call native libraries and process native data without the brittleness and pitfalls of JNI.

·        JEP 420: Pattern Matching for Switch (Second Preview)Enhances the Java programming language with pattern matching for switch expressions and statements, along with extensions to the language of patterns. Extending pattern matching to switch allows an expression to be tested against a number of patterns, each with a specific action, so that complex data-oriented queries can be expressed concisely and safely.

Future Proofing Java Programs

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·        JEP 421: Deprecate Finalization for RemovalFinalization remains enabled by default for now, but can be disabled to facilitate testing. In a future release, it will be disabled by default, and in a later release, it will be removed. Maintainers of libraries and applications that rely upon finalization should consider migrating to other resource management techniques such as the try-with-resources statement and cleaners.

Supporting Java Customers

The Oracle Java SE Subscription, a predictable pay-as-you-go offering, provides customers with best in class support, entitlement to GraalVM Enterprise, access to the Java Management Service, and the flexibility to upgrade at the pace of their business. This helps IT organizations manage complexity, contain costs, and mitigate security risks.

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