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This introductory chapter covers important concepts, tools, and techniques for building J2EE and XML applications. As a distributed application developer, you face a broad range of challenges as you begin each new project. These challenges range from architectural and design issues to tool selection and management of the development process. To overcome these challenges, you require both an appreciation for distributed systems development issues and knowledge of the specific tools that you can use in J2EE development. Section 1.1 describes the aspects of distributed application development that you need to understand to make effective use of J2EE and XML. In that section we present the n-tier application architecture under which most enterprise Java systems are constructed today. We define the logical layers of these applications and describe the types of components and challenges associated with each layer. We also identify the specific types of challenges you are likely to face when designing your application and present alternatives for dealing with those challenges. In section 1.1, we also cover the often-misunderstood area of distributed application security. Without the ability to secure your distributed application properly, its usefulness can quickly be negated. We summarize your options for securing communication channels and application components in this section. Sections 1.2 and 1.3 describe the tools and techniques you need to have success with the J2EE platform. These range from defining an overall development process to choosing your design, development, and configuration management tools. We suggest popular open source tools, which are available for many aspects of development. We also suggest strategies for testing and deploying your J2EE and XML application.

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Excel 2007 is much different from the version you ve been used to . To explain all of these differences in detail would require the equivalent of software training and would clearly go beyond the scope of this book . In this first chapter, I will therefore stick to explaining basic principles that will help you to easily follow the descriptions aligned to the main topic and theme of the book .

If you haven t already seen the images in the new version, you ll be surprised by the dramatically changed appearance of the program when you install the new version of Microsoft Excel and open it for the first time . Particularly noticeable is the Ribbon, which takes up a good 20% of the displayable area in the upper area of the application window . It replaces the menus and task-specific toolbars, which have disappeared and won t be reintroduced . So, there s no way around it: you ll have to familiarize yourself with the program s new command structures .

A distributed computing system is a collection of independent computer processes that communicate with one another by passing messages.

In relation to Figure 1-1, we ll first look at an overview of the most important elements of the command area (details about this are provided further on): 1. You select the Office Button to open a menu, which you can use to open new or saved workbooks, save, print, or close workbooks, or manage Excel options . More information is provided later .

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As demonstrated in Figure 2-3, the values for the appropriate environment variables were printed as expected. If you do not have Visual Studio installed on the machine running this le, then the last two values may result in an empty value for the variable. You can get the value for an environment variable by using the property notation. Assigning a value to a property that has the same name as an environment variable has no effect on the environment variable itself. The $(PropertyName) notation can get a value only from an environment variable; it will never assign values to environment variables. Let s move on to discuss reserved properties.

By the definition, every application or service you develop using J2EE and XML will be part of a distributed system. To build the best J2EE and XML solutions possible, understanding general distributed system concepts and design challenges is essential. This section covers the subjects you need to know before worrying about how to integrate J2EE technology X with XML standard Y. Since we are

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