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This text bundles together separate chapters written by various members of the Sun "Enterprise Team." The prominent methodology here is the consistent use of the model-view-controller (MVC) paradigm for designing the server-side tiers. In MVC, data (model) is kept separate from its presentation (view), and the two are coordinated through a controller class. The book uses quite a few useful architectural diagrams, which show how to combine Enterprise Java Beans (EJBs), servlets, and JavaServer Pages (JSPs) effectively. Managers or project leaders who might not code with Java everyday might learn from these diagrams how Java components work together within Web applications. Also, the authors explain the Sun "vision" for Java for a variety of e-commerce scenarios (including several business-to-business systems).
Separate chapters dig into the client, Web, EJB, and "enterprise information systems" tiers, and where to use various J2EE APIs for the best scalability and maintainability. Later sections look at deploying EJBs, as well as options for transaction management and security for the enterprise. The authors close with a complete Web application created with EJBs and servlets for an online pet store --a useful illustration of J2EE at work. All in all, this text is a valuable tour of Sun's official "vision" for enterprise-level computing with Java. It demystifies how various Java APIs can work together to create robust and scalable Web applications. Any IS manager or developer designing with J2EE will want a look at this book to learn how to take full advantage of the latest features for Java-based Web applications. --Richard Dragan
Topics covered: Overview of Java 2, Enterprise Edition (J2EE), for enterprise application development, application scenarios (including stand-alone clients, Web-based and business-to-business scenarios), J2EE components for client-side and server-side tiers (including applets and Enterprise Java Beans (EJBs)), platform roles for companies using Java, overview of Java APIs and services: JNDI and naming services, deployment, transaction, and security services, Java communication support: networking support, Remote Method Invocation (RMI), OMG CORBA support, Java Message Service (JMS), and JavaMail; building Web and EJB clients, the model-view-controller paradigm explained, combining servlets, JSPs, and EJBs on the middle tier, using entity and session EJBs, stateful and stateless session beans, sample applications for the enterprise information systems tier (applications for an e-store, human resources, and distributed purchasing), packaging and deployment, transaction management (JTA, JTS, and EJB transactions), Java security overview, and a case study and sample code for an e-commerce pet store.
This book describes a standard approach to designing multitier enterprise applications with the Java™ 2 Platform, Enterprise Edition. The book does not contain information on how to use individual J2EE™ technologies to develop applications, but rather focuses on guidelines for distributing application functionality across tiers and choosing among design options within each tier.
The book describes the principles and technologies employed in building J2EE applications and the specific approach adopted by a sample application. Striking a balance between specificity on the one hand, and articulating broader principles on the other, is never easy. The hope is that the principles presented are both consistent with and complement the sample application documented in the book.
This book is most relevant to IT managers, system architects, and enterprise application developers considering a transition to or intending to use the J2EE platform or vendors providing J2EE products. How This Book Is Organized
This book contains the following chapters:
Chapter 1, "Introduction," discusses challenges in building enterprise applications and describes how the J2EE platform addresses those challenges. The chapter also discusses application scenarios that the J2EE platform supports. Chapter 2, "J2EE Platform Technologies," provides an overview of the component, service, and communication technologies supported by the J2EE platform. Chapter 3, "The Client Tier," presents implementation options for J2EE clients and provides guidelines for choosing among these options. Chapter 4, "The Web Tier," describes technologies available for supporting development in the Web tier. It includes guidelines and techniques for using J2EE Web components and describes several Web application architectures. Chapter 5, "The Enterprise JavaBeans Tier," describes the capabilities of the EJB tier of the J2EE platform and discusses design choices for implementing business logic. Chapter 6, "The Enterprise Information System Tier," describes recommended approaches for accessing enterprise information systems and how J2EE components must be configured to access them. Chapter 7, "Packaging and Deployment," describes the capabilities provided by the J2EE platform for packaging and deploying J2EE applications, provides heuristics and practical tips on how to use these capabilities, and provides recommendations to the vendors who provide deployment tools. Chapter 8, "Transaction Management," describes the transaction services provided by the J2EE platform and provides recommendations on how to best use those services. Chapter 9, "Security," describes the mapping of the J2EE security model to enterprise computing environments and infrastructures. Chapter 10, "The Sample Application," illustrates the J2EE programming model in the context of an in-depth description of a multitier J2EE application. "Glossary," is a list of words and phrases found in this book and their definitions.From the sample application download page you can also download Sun's J2EE SDK, a freely available implementation of the J2EE v1.2 platform.Copyright 1999, Sun Microsystems, Inc.Java™ 2 Platform, Standard Edition, Version 1.2.2 API Specification. Copyright 1993-99, Sun Microsystems, Inc.Java™ Servlet Specification, Version 2.2 (Servlet specification). Copyright 1998, 1999, Sun Microsystems, Inc.JavaServer Pages™ Specification, Version 1.1 (JSP specification). Copyright 1998, 1999, Sun Microsystems, Inc.Enterprise JavaBeans™ Specification, Version 1.1 (EJB specification). Copyright 1998, 1999, Sun Microsystems, Inc.JDBC™ 2.0 API (JDBC specification). Copyright 1998, 1999, Sun Microsystems, Inc.JDBC™ 2.0 Standard Extension API (JDBC extension specification). Copyright 1998, 1999, Sun Microsystems, Inc.Java™ Transaction API, Version 1.0.1 (JTA specification). Copyright 1998, 1999, Sun Microsystems, Inc.Java™ Transaction Service, Version 0.95 (JTS specification). Copyright 1997-1999, Sun Microsystems, Inc.Java Naming and Directory Interface™, Version 1.2 (JNDI specification). Copyright 1998, 1999, Sun Microsystems, Inc.Java IDL. Copyright 1993-99, Sun Microsystems, Inc.RMI over IIOP 1.0.1.Java™ Message Service, Version 1.0.2 (JMS specification). Copyright 1998, Sun Microsystems, Inc.JavaMail™ API Design Specification, Version 1.1 (JavaMail specification). Copyright 1998, Sun Microsystems, Inc.JavaBeans™ Activation Framework Specification, Version 1.0.1 (JAF specification). Copyright 1998, Sun Microsystems, Inc.Acknowledgments
This book is the result of many people's efforts.
Each Enterprise Team member had primary responsibility for one chapter and made significant contributions to other chapters. In addition, Danny Coward wrote the initial draft of the deployment chapter.
The authors of the J2EE specifications and the developers of the reference implementation provided useful input at various points during the development of the J2EE programming model.
We are indebted to Rick Cattell, Bill Shannon, Mark Hapner, John Crupi, Sean Brydon, and many other reviewers who provided feedback on early versions of the manuscript.
Jim Inscore and Stephanie Bodoff provided editorial oversight of this project.
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