The plan is to have the Java platform define and implement a standard class-file API to evolve together with the class-file format. This has resulted in errors and in framework developers trying to write code to parse class files from the future and hoping nothing too serious will change. This speed of evolution has resulted in frameworks more frequently encountering class files that are newer than the class-file library. However, the Java class-file format evolves more quickly now than previously, due to standard Java’s six-month release cadence. Parsing, generating, and transforming class files is ubiquitous, used by independent tools and libraries to examine and extend programs without jeopardizing maintainability of source code. It is intended to enable JDK components to migrate to the standard API and eventually remove the JDK’s internal copy of the third-party ASM library. The class-file API will provide a standard API for parsing, generating, and transforming Java class files. The goal behind the ability to launch multi-file source code programs is to make the transition from small programs to larger programs more gradual, allowing developers to choose whether and when to go to the trouble of configuring a build tool. The enhancement to the Java application launcher will allow it to run a program supplied as multiple files of Java source code. This API was previewed in JDK 21 and incubated in JDK 19 and JDK 20. With structured concurrency, concurrent programming is simplified through an API that treats groups of related tasks running in different threads as a single unit of work, thereby streamlining error handling and cancellation, improving reliability, and enhancing observability. A second preview of implicitly declared classes and instance main methods, and an enhancement to the Java launcher that would enable it to run multi-file programs, also have been proposed.Įarly-access builds of JDK 22 are available at for Linux, Windows, and Mac. These latest features join a second preview of structured concurrency, a preview of statements before super(…), a preview of a class-file API, region pinning for the G1 garbage collector, a second preview of string templates, unnamed variables and patterns, a foreign function and memory API, and a seventh incubator of a vector API. This will allow stream pipelines to transform data in ways not easily achievable with existing built-in intermediate operations. As a result, those packages have moved, and this will require changes to package imports.Stream gatherers will enhance the stream API to support custom intermediate operations.
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