December 1, 2023


Step Into The Technology

JDK 19: The features targeted for Java 19

3 min read


Java Improvement Package 19, due this September, now has a second function officially proposed to concentrate on it: A vector API to express vector computations, which would go through a fourth incubation in the up coming Java launch. The other proposed characteristic is a port of the JDK to the open source Linux/RISC-V instruction set architecture (ISA).

JDK 19, or simply just Java 19, possibly could host a large number of characteristics, ranging from universal generics to benefit objects, in accordance to options beneath way for boosting Java. But so much, the vector API and the RISC-V port are the only formally proposed features to concentrate on JDK 19. JDK 19 would abide by JDK 18, which arrived March 22. Typical Java is on a 6-thirty day period release cadence.

The OpenJDK developers have published an official launch program for JDK 19, which has it arriving September 20 as a creation launch, preceded by rampdown phases June 9 and July 21, and release candidates to be printed August 11 and August 25.

The vector API would convey vector computations that reliably compile at runtime to optimum vector guidance on supported CPU architectures. Builders using the API gain a way to write intricate vector algorithms in Java, using the HotSpot auto-vectorizer but with a consumer model that will make vectorizations additional predictable and sturdy. The vector API previously was incubated into JDK 16, JDK 17, and JDK 19.

Enhancements to the API proposed for JDK 19 incorporate enhancements to load and retail store vectors to and from MemorySegments as described by the international function and memory API preview. JDK 19 would also insert two cross-lane vector operations, compress and expand, collectively with a complementary vector mask compress procedure. The compress vector operation maps lanes of a resource vector, picked by a mask, to a place vector in lane get although the develop procedure does the inverse. The compress procedure is helpful in filtering query results.

In an additional addition to the vector API, bitwise integral lanewide functions would be expanded, such as operations these kinds of counting the variety of one bits, reversing the get of bits, and compressing and expanding bits. Goals of the API bundled remaining crystal clear and concise, platform-agnostic, possessing trustworthy runtime and compilation overall performance on x64 and AArch64 architectures, and enabling “graceful” degradation, for situations in which a vector computation can’t be totally expressed at runtime as a sequence of vector functions.

With the Linux/RISC-V port, Java would gain guidance for a components instruction set that is previously supported by a huge variety of language toolchains. RISC-V essentially is a family members of connected ISAs. The Linux/RISC-V port would only guidance the RV64GV configuration of RISC-V, a common purpose 64-little bit ISA that incorporates vector directions. The developers of Java may possibly take into account other RISC-V configurations in the future.

The port would help the adhering to HotSpot VM selections: the template interpreter, C1 (client) JIT compiler, C2 (server) JIT compiler, and all existing mainline garbage collectors which includes ZGC and Shenandoah. The real porting is nearly entire the concentrate of the JDK Improvement Proposal (JEP) is integration of the port into the JDK mainline repository.

Aside from the RISC-V port and the vector API, a preview of the international perform and memory API, letting Java programs to interoperate with code and facts outdoors of the JVM runtime, also seems destined to getting formally focused to JDK 19, since the API proposal itself cites JDK 19 as a place.

Like JDK 18, JDK 19 is because of to be a limited-term launch, with only six months of prime-amount, Premier assistance.

The preceding launch, JDK 17, was a Very long Time period Support (LTS) launch, with a number of a long time of aid. It arrived September 14, 2021.

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