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  • Book Overview & Buying Oracle JRockit: The Definitive Guide
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Oracle JRockit: The Definitive Guide

Oracle JRockit: The Definitive Guide

4.8 (10)
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Oracle JRockit: The Definitive Guide

Oracle JRockit: The Definitive Guide

4.8 (10)

Overview of this book

Oracle JRockit is one of the industry’s highest performing Java Virtual Machines. Java developers are always on the lookout for better ways to analyze application behavior and gain performance. As we all know, this is not as easy as it looks. Welcome to JRockit: The Definitive Guide.This book helps you gain in-depth knowledge of Java from the JVM’s point of view. We will explain how to write code that works well with the JVM to gain performance and scalability. Starting with the inner workings of the JRockit JVM and finishing with a thorough walkthrough of the tools in the JRockit Mission Control suite, this book is for anyone who wants to know more about how the JVM executes your Java application and how to profile for better performance.
Table of Contents (23 chapters)
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Oracle JRockit
Credits
Foreword
About the Authors
Acknowledgement
About the Reviewers
Preface
12
Using the JRockit Management APIs
1
Bibliography
2
Glossary
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AST
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CAS
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HIR
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IR
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JFR
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JMX
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JRA
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JSR
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LIR
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MD5
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MIR
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PDE
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RCP
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SWT
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TLA
3
Index

The Java memory API


This section covers some of the unique constructs of the Java language, related to memory management.

Dreaming of delete or free operators for Java or trying to explicitly control the garbage collection behavior in a JVM by, for example, hanging on to objects longer than their natural lifespans is a sure way of shooting yourself in the foot. There are, however, some mechanisms in the Java language that make it possible to help the GC by giving it "hints". Some of the available mechanisms are good and some are bad. Some should be used with caution to avoid unwanted side effects.

Finalizers

In Java, since Java 1.0, every object contains a method called finalize that may be freely overridden by any implementer. The contract is that the finalize method is called just before the object in question is about to be garbage collected. This might seem like a good idea, making it possible to do cleanups before the object goes away, such as closing any open file handles that the object...

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Oracle JRockit: The Definitive Guide
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