Book Image

Java 11 and 12 ??? New Features

By : Mala Gupta
Book Image

Java 11 and 12 ??? New Features

By: Mala Gupta

Overview of this book

With its new six-monthly release cadence, Java is moving forward faster. In addition to planned version releases, a lot of work is currently being undertaken on various Java projects at Oracle. In order to make best use of the new features in their applications and libraries, you must be well-versed with the most recent advancements. Java 11 and 12 – New Features will take you through the latest developments in Java, right from variable type inference and simplified multithreading through to performance improvements, which are covered in depth to help you make your applications more efficient. This book explains the relevance and applicability of Java's new features, and answers your questions on whether to invest in migrating to new Java versions and when to migrate. You'll also get to grips with platform features, such as AppCDS and new garbage collectors, to tune and optimize your application—from reduced launch time and latency to improved performance and throughput. By the end of this book, you will be equipped with a thorough understanding of the new features of Java 11, 12, and Project Amber, and possess the skills to apply them with a view to improving your application's performance.
Table of Contents (23 chapters)
Free Chapter
1
Section 1: JDK 10
6
Section 2: JDK 11
13
Section 3: JDK 12
16
Section 4: Project Amber

Garbage Collector Optimizations

Java 10 offered two major improvements in the garbage collection (GC) domain. It included parallel full GC for garbage-first (G1) GCs, improving its worst-case latency. It also improved source code isolation of multiple GCs for the GC code in HotSpot, introducing the GC interface.

G1 was designated as the default GC in Java 9. G1 was designed to avoid full collections by dividing memory into the survivor, eden, and old memory regions, and by performing intermediate GCs to free up the heap. However, when the pace of object allocation is high and memory can't be reclaimed fast enough, full GC occurs. Until JDK 9, full GC for G1 was executed using a single thread. Java 10 supports parallel full GC for G1.

The creation of the GC interface is a pure refactoring of the HotSpot internal code. It isolates the source code of GCs by introducing a clean...