Preface

This book is the result of an amazing series of events.

In high school, back in the pre-Internet era, the authors used to hang out at the same bulletin board systems and found each other in a particularly geeky thread about math problems. Bulletin board friendship led to friendship in real life, as well as several collaborative software projects. Eventually, both authors went on to study at the Royal Institute of Technology (KTH) in Stockholm.

More friends were made at KTH, and a course in database systems in our third year brought enough people with a similar mindset together to achieve critical mass. The decision was made to form a consulting business named Appeal Software Solutions (the acronym A.S.S. seemed like a perfectly valid choice at the time). Several of us started to work alongside our studies and a certain percentage of our earnings was put away so that the business could be bootstrapped into a full-time occupation when everyone was out of university. Our long-term goal was always to work with product development, not consulting. However, at the time we did not know what the products would turn out to be.

In 1997, Joakim Dahlstedt, Fredrik Stridsman and Mattias Joëlson won a trip to one of the first JavaOne conferences by out-coding everyone in a Sun sponsored competition for university students. For fun, they did it again the next year with the same result.

It all started when our three heroes noticed that between the two JavaOne conferences in 1997 and 1998, the presentation of Sun's adaptive virtual machine HotSpot remained virtually unchanged. HotSpot, it seemed at the time, was the answer to the Java performance problem. Java back then was mostly an interpreted language and several static compilers for Java were on the market, producing code that ran faster than bytecode, but that usually violated the language semantics in some fundamental way. As this book will stress again and again, the potential power of an adaptive runtime approach exceeds, by far, that of any ahead-of-time solution, but is harder to achieve.

Since there were no news about HotSpot in 1998, youthful hubris caused us to ask ourselves "How hard can it be? Let's make a better adaptive VM, and faster!" We had the right academic backgrounds and thought we knew in which direction to go. Even though it definitely was more of a challenge than we expected, we would still like to remind the reader that in 1998, Java on the server side was only just beginning to take off, J2EE hardly existed and no one had ever heard of a JSP. The problem domain was indeed a lot smaller in 1998.

The original plan was to have a proof of concept implementation of our own JVM finished in a year, while running the consulting business at the same time to finance the JVM development. The JVM was originally christened "RockIT", being both rock 'n' roll, rock solid and IT. A leading "J" was later added for trademark reasons.

Naturally, after a few false starts, we needed to bring in venture capital. Explaining how to capitalize on an adaptive runtime (that the competitors gave away their own free versions of) provided quite a challenge. Not just because this was 1998, and investors had trouble understanding any venture not ultimately designed to either (1) send text messages with advertisements to cell phones or (2) start up a web-based mail order company.

Eventually, venture capital was secured and in early 2000, the first prototype of JRockit 1.0 went public. JRockit 1.0, besides being, as someone on the Internet put it "very 1.0", made some headlines by being extremely fast at things like multi-threaded server applications. Further venture capital was acquired using this as leverage. The consulting business was broken out into a separate corporation and Appeal Software Solutions was renamed Appeal Virtual Machines. Sales people were hired and we started negotiations with Sun for a Java license.

Thus, JRockit started taking up more and more of our time. In 2001, the remaining engineers working in the consulting business, which had also grown, were all finally absorbed into the full-time JVM project and the consulting company was mothballed. At this time we realized that we both knew exactly how to take JRockit to the next level and that our burn rate was too high. Management started looking for a suitor in the form of a larger company to marry.

In February 2002, BEA Systems acquired Appeal Virtual Machines, letting nervous venture capitalists sleep at night, and finally securing us the resources that we needed for a proper research and development lab. A good-sized server hall for testing was built, requiring reinforced floors and more electricity than was available in our building. For quite a while, there was a huge cable from a junction box on the street outside coming in through the server room window. After some time, we outgrew that lab as well and had to rent another site to host some of our servers.

As part of the BEA platform, JRockit matured considerably. The first two years at BEA, plenty of the value-adds and key differentiators between JRockit and other Java solutions were invented, for example the framework that was later to become JRockit Mission Control. Several press releases, world-beating benchmark scores, and a virtualization platform quickly followed. With JRockit, BEA turned into one of the "big three" JVM vendors on the market, along with Sun and IBM, and a customer base of thousands of users developed. A celebration was in order when JRockit started generating revenue, first from the tools suite and later from the unparalleled GC performance provided by the JRockit Real Time product.

In 2008, BEA was acquired by Oracle, which caused some initial concerns, but JRockit and the JRockit team ended up getting a lot of attention and appreciation.

For many years now, JRockit has been running mission-critical applications all over the world. We are proud to have been part of the making of a piece of software with that kind of market penetration and importance. We are equally proud to have gone from a pre-alpha designed by six guys in a cramped office in the Old Town of Stockholm to a world-class product with a world-class product organization.

The contents of this book stems from more than a decade of our experience with adaptive runtimes in general, and with JRockit in particular. Plenty of the information in this book has, to our knowledge, never been published anywhere before.

We hope you will find it both useful and educational!

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Oracle JRockit: The Definitive Guide

By : Marcus Hirt, Marcus Lagergren

Oracle JRockit: The Definitive Guide

By: Marcus Hirt, Marcus Lagergren

Overview of this book

Preface

Oracle JRockit: The Definitive Guide

By : Marcus Hirt, Marcus Lagergren

Oracle JRockit: The Definitive Guide

By: Marcus Hirt, Marcus Lagergren

Overview of this book

Preface

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