Other updates include functionality to use C++14 language features in JDK C++ code, a second preview of sealed classes, concurrent thread-stack processing in garbage collector ZGC, and support for Unix-domain sockets in socket and server-socket channels. Together with the Foreign-Memory Access API, which is also included in a new iteration, it is planned to serve as a basis for third-party native interoperation frameworks. It is part of Oracle’s Project Panama which looks to create a bridge between Java and native functions. The Foreign Linker API meanwhile looks to “simplify the otherwise error-prone process of binding to a native library”. Under the hood it makes use of the HotSpot performance engine which already sports auto-vectorization capabilities, though the new API is said to be more predictable and robust – traits pretty much necessary in the fields Java looks to make a name for itself with this. The Vector API provides capability to write complex vector algorithms which can be found in areas such as machine learning and cryptography. While those features are ready to be used in production, JDK 16 also includes a couple of experimental additions such as the Vector and Foreign Linker APIs. This is meant to provide application users with a familiar installation format and give devs an easy way to spread their creations amongst a wider audience. It is based on the legacy JavaFX tool javapackager and provides functionality to package self-contained Java applications and necessary dependencies in native formats deb and rpm, pkg and dmg, and msi and exe.
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Aside from reducing the off-heap memory usage of the HotSpot engine, this is also hoped to make the metaspace code easier to maintain, freeing up capacities that can then be invested into other parts of the project.Īfter spending two release cycles in the project incubator, packaging tool jpackage reached production-readiness in the current release.
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The Java team also introduced what it calls elastic metaspace, a feature making use of the “buddy-based allocation scheme” present in the Linux kernel, to free up memory occupied by unused class-metadata quicker and allocate smaller chunks. The new versions, which are now available, have been fitted with a couple of refinements, allowing inner classes to declare record class members, and adding a compile-time error for cases in which instanceof expressions are pointless. Both were introduced in JDK 14 to make dev’s lives easier by offering a concise way to model plain data aggregates and test the structure of an expression respectively. Java 16 saw a couple of language features maturing into general availability, the most anticipated surely being Records, and pattern matching for instanceof. The latter move is aimed at meeting devs where they are and lowering the initial barrier for new committers, which might be necessary to keep the language growing.
Since the last release the project was also able to finish the migration from version control system Mercurial to git and bring its code base to GitHub.
JDK 16, the implementation of v16 of the Java SE Platform, has landed bang on time, providing developers with refined language features and a finished packaging tool to make distributing their apps a little easier.
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