Source Code for This Book
Source Code for This Book
The associated code files described in this book are available on the
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Part I: J2EE Application Development Essentials
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Chapter 1. Understanding the Java 2 Platform, Enterprise EditionIn This Chapter
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Overview
One of the challenges that people encounter when being introduced to something new is deciphering exactly what they are learning, and what the constituents of that subject are. Only once they have a good basic
The Java 2 Platform, Enterprise Edition (J2EE) is no exception to this rule. There have been many cases where people have strayed away from using this platform for developing business applications, purely on the basis they could not understand it or it was presented as a very complex specification. Therefore it appeared to present a high degree of risk in its adoption for any development effort. The objective of this chapter is to cut through the complexities of the J2EE specification, presenting it in a very intuitive manner. Subsequent chapters in Part I of this book will methodically build your knowledge of the J2EE platform.
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Java Technology TodayToday, Java is more than just a programming language; it has become a technology and a platform for developing applications for the Internet and enterprise information systems, as well as electronic consumer devices. In order to promote the use of the Java 2 Platform across a wide spectrum of application scenarios and environments, Sun provides three editions of the Java 2 technology:
Java technologies support hardware and OS independence by enabling system services to be accessed directly through the Java 2 Platform APIs within the context of a standards-based Java Virtual Machine (JVM), as opposed to the complex APIs of an underlying device (PDAs and cellular phones) or operating system (Solaris, Linux, Macintosh, and Windows).
There is a theory that "
consistency builds competency
." The Java 2 platform promotes a consistent and proven mechanism for constructing applications independent of the deployment environment. This "Write Once and Deploy Anywhere" approach
Note "Write Once, Run Anywhere" is a promise that is exclusive to the Java language. As long as a device or an operating system can support a Java Virtual Machine (JVM), which interprets the Java compiled code known as Java bytecode to computer machine or device instructions, Java software will run on it.
Today the evolution of the Java 2 Platform has moved away from Sun and is fostered by the Java Community Process (JCP), an international organization of Java developers and stakeholders of the Java technology. The objectives of the JCP Executive Committees are to ensure that the revisions to the Java technology specifications, reference
Note You can find more information on the Java Community Process and how you can participate in the evolution the Java 2 Platform by visiting www.jcp.org. |