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This book, now in its second edition, describes standard approaches to designing multitier enterprise applications with the JavaTM 2 Platform, Enterprise Edition. This book, and the accompanying Java Pet Store sample application, are part of the successful Java BluePrints program created by Sun Microsystems with the introduction of the J2EE platform. This program has been used by thousands of application architects, developers, and students to attain better understanding of the programming model inherent in the J2EE platform.

This book and the Java BluePrints program don't provide information on how to use individual Java technologies to write applications -- that's the role of the companion Java Tutorial program. Instead, Java BluePrints focuses on guidelines for application architecture, such as distributing J2EE application functionality across tiers and choosing among design options within each tier. This book assumes that the reader already has basic knowledge of the J2EE platform. We recommend that readers without this knowledge familiarize themselves with the J2EE Tutorial either before or while reading this volume. See "Related Information" later in the Preface for details.

This book describes the architecture and design principles employed in building J2EE applications, and explores of the specific approach adopted by the sample application. Striking a balance between specific details and broad principles is never easy. The hope behind this effort is that the principles presented here are both consistent with and a useful complement to the implementation provided by the sample applications documented in this book.

This book is intended primarily for system architects and enterprise application developers engaged in or considering a transition to the J2EE platform. It is also useful for product vendors interested in developing applications consistent with the J2EE standard

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