Book Image

Mastering Java 11 - Second Edition

By : Dr. Edward Lavieri, Mandar Jog

Book Image

Mastering Java 11 - Second Edition

By: Dr. Edward Lavieri, Mandar Jog

Overview of this book

Java 11 is a long-term release and its new features add to the richness of the language. It emphasizes variable-type inference, performance improvements, along with simplified multithreading. The Java platform has a special emphasis on modularity, making this the programming platform of choice for millions of developers. The modern Java platform can be used to build robust software applications, including enterprise-level and mobile applications. Fully updated for Java 11, this book stands to help any Java developer enjoy the richness of the Java programming language. Mastering Java 11 is your one-stop guide to fully understanding recent Java platform updates. It contains detailed explanations of the recent features introduced in Java 9, Java 10, and Java 11 along with obtaining practical guidance on how to apply the new features. As you make your way through the chapters, you'll discover further information on the developments of the Java platform and learn about the changes introduced by the variable handles and Project Coin, along with several enhancements in relation to import statements processing. In the concluding chapters, you'll learn to improve your development productivity, making your applications more efficient. You'll also be able to get to grips with the command-line flags with respect to various utilities and the command-line utility changes featured in the current Java platform. By the end of the book, you'll have obtained an advanced level understanding of the Java platform and its recent changes.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

The Java 11 Landscape

The Java 11 Landscape

Technical requirements

Understanding the Java platform's new versioning model

Understanding the significance of Java 9

Benefiting from changes introduced with Java 10

Benefiting from changes introduced with Java 11

Further reading

Discovering Java 11

Discovering Java 11

Technical requirements

Improved contended locking

Segmented code cache

Smart Java compilation

Resolving lint and doclint warnings

Tiered attribution for Javac

Annotations pipeline 2.0

New version-string scheme

Generating runtime compiler tests automatically

Testing class-file attributes generated by Javac

Storing interned strings in class-data sharing archives

Preparing JavaFX UI controls and Cascading Style Sheet APIs for modularization

Compact strings

Merging selected Xerces 2.11.0 updates into JAXP

Updating JavaFX/Media to the newer version of GStreamer

HarfBuzz font-layout engine

HiDPI graphics on Windows and Linux

Marlin graphics renderer

Reserved stack areas for critical sections

Dynamic linking of language-defined object models

Additional tests for humongous objects in G1

Improving test-failure troubleshooting

Optimizing string concatenation

HotSpot C++ unit-test framework

Enabling GTK3 on Linux

New HotSpot build system

Consolidating the JDF forest into a single repository

Further reading

Java 11 Fundamentals

Java 11 Fundamentals

Technical requirements

Working with variable handlers

Import statement depreciation warnings

Milling Project Coin

Import statement processing

Inferring local variables

Thread-local handshakes

Heap allocation on alternative memory devices

Root certificates

Dynamic class-file constants

Removal of the Java EE and CORBA modules

Further reading

Building Modular Applications with Java 11

Building Modular Applications with Java 11

Technical requirements

A modular primer

The modular JDK

Modular runtime images

Modular Java application packaging

The Java Linker

Encapsulating most internal APIs

Further reading

Migrating Applications to Java 11

Migrating Applications to Java 11

Technical requirements

A quick review of Project Jigsaw

How modules fit into the Java landscape

Migration planning

Advice from Oracle

Runtime image changes

Deploying your applications

Further reading

Experimenting with the Java Shell

Experimenting with the Java Shell

Technical requirements

Understanding JShell

Getting started with JShell

Practical uses of JShell

Working with scripts

Further reading

Leveraging the Default G1 Garbage Collector

Leveraging the Default G1 Garbage Collector

Technical requirements

Overview of garbage collection

The pre-Java 9 garbage collection schema

Collecting garbage with the new Java platform

Persistent issues

Further reading

Microbenchmarking Applications with JMH

Microbenchmarking Applications with JMH

Technical requirements

Microbenchmarking overview

Microbenchmarking with Maven

Benchmarking options

Techniques for avoiding microbenchmarking pitfalls

Further reading

Making Use of the Process API

Making Use of the Process API

Technical requirements

Introducing processes

Working with the ProcessHandle interface

Reviewing a sample process controller app

Further reading

Fine-Grained Stack Tracing

Fine-Grained Stack Tracing

Technical requirements

Overview of the Java Stack

The importance of stack information

Working with StackWalker

New Tools and Tool Enhancements

New Tools and Tool Enhancements

Technical requirements

Working with the HTTP client

Understanding Javadoc and the Doclet API

Changes to the Multiple JRE feature

JavaScript Parser

Multiple-release JAR files

Java-level JVM Compiler Interface

Platform logging

Platform-specific desktop features

Enhanced method handling

Enhanced depreciation

The native header generation tool (javah)

Further reading

Concurrency Enhancements

Concurrency Enhancements

Technical requirements

Reactive programming

Additional concurrency updates

Spin-wait hints

Further reading

Security Enhancements

Security Enhancements

Technical requirements

Datagram Transport Layer Security

Creating PKCS12 keystores

Improving security application performance

The TLS application-layer protocol negotiation extension

Leveraging CPU instructions for GHASH and RSA

OCSP stapling for TLS

DRBG-based SecureRandom implementations

Further reading

Command-Line Flags

Command-Line Flags

Technical requirements

Unified JVM logging

Compiler control

Diagnostic commands

The heap profiling agent

Removing your JHAT

Command-line flag argument validation

Compiling for older platform versions

The experimental Java-based JIT compiler

Further reading

Additional Enhancements to the Java Platform

Additional Enhancements to the Java Platform

Technical requirements

Support for UTF-8

Unicode support

Linux/AArch64 port

Multiresolution images

Common Locale Data Repository

Future Directions

Future Directions

Technical requirements

An overview of the JDK Enhancement Proposal

Ongoing special projects

Contributing to the Java Platform

Contributing to the Java Platform

Technical requirements

The Java Community

Participating in a Java User Group

Java Community Process

Oracle Technology Network

Writing technical articles

Assessment

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Understanding JShell

JShell is an important tool that is relatively new to the Java platform. It was introduced with JDK 9. It is an interactive REPL tool that is used to evaluate the following Java programming language components—declarations, statements, and expressions. It has its own API so that it can be used by external applications.

Read-Eval-Print Loop is often referred to as REPL, taking the first letter from each word in the phrase. It is also known as a language shell or interactive top level.

The introduction of JShell was a result of JDK Enhancement Proposal (JEP) 222. Here are the stated goals of this JEP in regards to the Java Shell command-line tool:

Facilitates rapid investigation
Facilitates rapid coding
Provides an edit history

The rapid investigation and coding listed previously include statements and expressions. Impressively, these statements and...