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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
- Veröffentlichungsjahr: 2010
EJB (Enterprise JavaBeans) 3.0 is a commonly used database persistence technology in Java EE applications. EJB 3.0 has simplified the development of EJBs with an annotations-based API that eliminates the use of remote/local interfaces, home/local home interfaces, and deployment descriptors. A number of other books are available on EJB 3.0, but none covers EJB 3.0 support in Oracle Fusion Middleware 11g, which is one of the leaders in the application server market.This is the first book that covers all aspects of EJB 3.0 database persistence development using Oracle Fusion Middleware technology. It covers all the best practices for database persistence ensuring that your applications are easily maintainable. Leaving theory behind, this book uses real-world examples to guide you in building your own EJB 3.0 applications that are well integrated with commonly used Java EE frameworks.The book gets going by discussing the new features in the EJB 3.0 specification. As some readers may still be using EJB 2.0, the book explains how to convert your EJB 2.0 entity beans to EJB 3.0. It then goes on to discuss using EJB 3.0 database persistence with JDeveloper, WebLogic Server, and Enterprise Pack for Eclipse, the main Java EE components of Oracle Fusion Middleware 11g. The book also covers EJB 3.0 relationships and integrating EJB 3.0 relationships with JSF user interfaces. EJB 3.0 database persistence with some of the commonly used frameworks such as ADF Faces, AJAX, and Web Services is also discussed in the book. It uses the integrated WebLogic Server 11g in some of the chapters and the standalone WebLogic Server in other chapters. While JDeveloper is the primary Java IDE used in the book, one of the chapters is based on the Oracle Enterprise Pack for Eclipse.By the time you reach the end of this book, you will be well-versed with developing EJB 3.0 applications using the different Java EE components of Oracle Fusion Middleware 11g.
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Table of Contents
EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g
EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g
Copyright © 2010 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: August 2010
Production Reference: 1190810
Published by Packt Publishing Ltd.
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Olton
Birmingham, B27 6PA, UK.
ISBN 978-1-849681-56-8
www.packtpub.com
Cover Image by Tina Negus (<[email protected]>)
Credits
Author
Deepak Vohra
Reviewers
Maxence Button
Niall C. Commiskey
Balamurali Kothandaraman
Frank Nimphius
Acquisition Editor
Amey Kanse
Development Editor
Wilson D'souza
Technical Editors
Arani Roy
Conrad Sardinha
Kavita Iyer
Indexer
Monica Ajmera Mehta
Editorial Team Leader
Mithun Sehgal
Project Team Leader
Lata Basantani
Project Coordinator
Srimoyee Ghoshal
Proofreader
Sandra Hopper
Production Coordinator
Alwin Roy
Cover Work
Alwin Roy
About the Author
Deepak Vohra is a consultant and a principal member of the NuBean.com software company. Deepak is a Sun Certified Java Programmer and Web Component Developer, and has worked in the fields of XML and Java programming and J2EE for over five years. Deepak is the co-author of the Apress book Pro XML Development with Java Technology and was the technical reviewer for the O'Reilly book WebLogic: The Definitive Guide. Deepak was also the technical reviewer for the Course Technology PTR book Ruby Programming for the Absolute Beginner, and the technical editor for the Manning Publications book Prototype and Scriptaculous in Action. Deepak is also the author of the Packt Publishing books JDBC 4.0 and Oracle JDeveloper for J2EE Development and Processing XML documents with Oracle JDeveloper 11g.
About the Reviewers
Maxence Button started to work with Java in 2000. He has worked as a developer, architect, and more recently as a consultant for BEA, then Oracle. This position allowed him to specialize in the WebLogic and AquaLogic lines of products, then in the Oracle Fusion Middleware stack.
After three years working as a principal consultant on Oracle | BEA technology, he started his own company in March, 2010 and now advises his clients, in the pure spirit of independence.
I would like to thank my wife for her patience throughout the whole process, which held me stuck in front of my PC for a few evenings :)
Niall Commiskey works as a Senior Principal Technologist with Oracle Corporation. He is part of the PTS group within Oracle, which assists Oracle partners in getting the most out of Oracle technologies. In his previous role within the organization, Niall worked for Oracle Consulting Services in Germany. He has over 20 years of IT development experience, ranging from mainframe assembler to SOA developer. He works for Oracle, which is the world's largest enterprise software company.
Thanks to my wife Renate and children, Lucia and Phillip, for teaching me what life is really about.
Balamurali Kothandaraman [Bala] has over 14 years of experience in IT Architecture, including full Blue-print of Reference and Enterprise Architecture. He has been involved in product development, design, consultation, project mentoring, product readiness, technology mentoring, solution design, and architecture on various technologies like Java, Java EE, C, C++, and so on, including SOA-based application frameworks. He is currently working as a Principal Instructor with Oracle Corporation involved in assisting customers with implementing their Enterprise Architecture using Oracle Fusion Middleware product suites. He worked for more than seven years with BEA Systems Inc. as a Senior Delivery Technologist involved in assisting various customers with designing and implementing Service-Oriented Architecture for their enterprise using the BEA WebLogic and AquaLogic Product suites. Prior to BEA, he worked for many consulting houses, such as 3i Infotech, and Technosoft, HCL Technologies where he designed, developed, and implemented Enterprise Solutions for various organizations.
Bala is a globally recognized speaker and workshop modulator on various major events covering hot topics such as SOA, Event-Driven Architecture, and Enterprise Architecture Principles and Methodologies. He has presented at JavaOne, BEAWorld conferences, BEA Support Webinars, and WebLogic User Groups. Bala also published technical articles with various journals and web sites, such as WebLogic Developers Journal, BEA Dev2Dev, and so on. Bala constantly blogs about WebLogic Server at http://weblogicserver.blogspot.com.
Frank Nimphius is a Senior Principal Product Manager for Oracle JDeveloper and Oracle Application Development Framework (ADF) within the Oracle Application Development Tool Product Management group. In his current job role, Frank actively presents the Oracle development team at Oracle and non-Oracle conferences around the world and recently co-authored the Oracle Press book: Oracle Fusion Developer Guide: Building Rich Internet Applications with Oracle ADF Business Components and Oracle ADF Faces.
Preface
EJB (Enterprise JavaBeans) 3.0 entity beans is a commonly used database persistence technology. EJB 3.0 has simplified the development of EJBs with an annotations-based API that does not require remote/local interfaces, home/local home interfaces, or deployment descriptors. Developing entity EJBs requires an application server and a relational database, and optionally a Java EE IDE to simplify the process of development. The objective of the JSR-000220 Enterprise JavaBeans 3.0 specification (http://jcp.org/aboutJava/communityprocess/final/jsr220/index.html) is to improve the EJB architecture by reducing its complexity from the developer's point of view. EJB 3.0 has introduced some new features, which include support for metadata annotations, default values for configuration, simplified access to environment variables, simplified session and entity beans, interceptors, enhanced support for checked exceptions, and elimination of callback interfaces.
A number of books are available on EJB 3.0, but none cover EJB 3.0 on the Oracle Fusion Middleware (11g) platform. Most of the EJB 3.0 books are GlassFish server based, which has only 10percent of the application server market. Welcome to EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g, a book that will teach you how to leverage EJB 3.0 persistence on Oracle Fusion Middleware 11g. Oracle Fusion Middleware 11g includes many components such as the SOA/BPM Suite, WebCenter, and Oracle Identity Management. All of these components run on Oracle Weblogic Server 11g. The main development tool (IDE) for Oracle Fusion Middleware is Oracle JDeveloper. In respect of EJB 3.0, JDeveloper provides wizard support to reverse engineer database tables as EJB 3.0 entity beans. JDeveloper 11g also provides a wizard for creating session beans. The JPA persistence provider used in JDeveloper 11g is the EclipseLink persistence provider. JDeveloper comes with its own embedded/integrated Weblogic Server instance, which makes it very easy to develop and test within the one environment. We shall be using the embedded WebLogic Server 11g in some of the chapters and the standalone WebLogic Server in others.
The objective of the book is to discuss the support of EJB 3.0 database persistence in Oracle Fusion Middleware 11g. While JDeveloper is the main Java IDE used in the book, one of the chapters leverages the Oracle Enterprise Pack for Eclipse. The book covers all aspects of EJB 3.0 database persistence including:
What this book covers
In Chapter 1, What's New in EJB 3.0, we discuss the new features in the EJB 3.0 specification, such as support for metadata annotations, default values for configuration, simplified session and entity beans, and enhanced support for checked exceptions.
In Chapter 2, Converting an EJB 2.0 Entity to an EJB, we convert an example EJB 2.0 entity bean to an EJB 3.0 entity bean. We also generate the session bean façade for the EJB 3.0 entity bean. XSLT transformation is used for converting the EJB 2.0 entity bean to an EJB 3.0 entity bean.
In Chapter 3, EclipseLink JPA Persistence Provider, we discuss the JPA framework and the EclipseLink persistence provider.
In Chapter 4, Building an EJB 3.0 Persistence Model with Oracle JDeveloper, we discuss EJB 3.0 database persistence with JDeveloper 11g, WebLogic Server 11g, and Oracle Database 10g. We create an EJB 3.0 entity bean from a database table, create a session bean façade, and finally create a JSP test client. Using the test client, we create, retrieve, and delete entity bean instances.
In Chapter 5, EJB 3.0 Persistence with Oracle Enterprise Pack for Eclipse, we discuss the same example we covered in Chapter 4, but with the Oracle Enterprise Pack for Eclipse, WebLogic Server, and the open source MySQL database, which has been acquired by Oracle.
In Chapter 6, EJB 3.0 with ADF Faces UI, we discuss using an ADF Faces client for EJB 3.0 database persistence. We create an entity bean using data input from an ADF Faces user interface (UI). Subsequently, we find an entity bean instance using data input from an ADF Faces UI.
In Chapter 7, Creating EJB 3.0 Entity Relationships, we discuss EJB 3.0 entity relationships using, as an example, three entity beans that have inter-relationships. We also discuss the significance of a fetch strategy.
In Chapter 8, EJB 3.0 Database Persistence with Ajax in the UI, we discuss EJB 3.0 database persistence in combination with Ajax in the user interface (UI). We demonstrate data validation and autocompletion with Ajax.
In Chapter 9, Using JSF with Entity Relationships, we discuss adding JSFs to EJB 3.0 database persistence to create and persist entity bean instances that have entity relationships between them.
In Chapter 10, Creating an EJB 3.0 Web Service, we create a JAX-WS Web Service from an EJB 3.0 entity bean, create a web service client, package and deploy the web service to WebLogic Server, and test the Web Service using the WebLogic console.
What you need for this book
The book is based on Oracle JDeveloper 11g Studio Edition for Windows and Oracle WebLogic Server 11g, Windows version, which are the two main components of Oracle Fusion Middleware 11g and may be downloaded from http://www.oracle.com/technology/software/products/middleware/index.html. If you have Linux installed, the book may still be used (though the source code and samples have not been tested with Linux); just download and install the Linux versions of Oracle JDeveloper 11g and Oracle WebLogic Server 11g. Slight modifications may be required with the Linux install; for example, the directory paths on Linux would be different than the Windows directory paths used in the book. For one of the chapters, you would need to download and install Oracle Enterprise pack for Eclipse from http://www.oracle.com/tools/enterprise-eclipse-pack.html. For database, you would need to download and install Oracle Database 10g/11g from http://www.oracle.com/technology/software/products/database/index.html. For another chapter, you would need to download and install the open source MySQL 5.x database from http://www.mysql.com/downloads/mysql/. The annotations used in EJB 3.0 are a J2SE 5.0 feature; therefore, you need to install J2SE 5.0 or later.
Who this book is for
The target audience of the book is EJB 3.0 application developers who want to learn about the practical use of EJB 3.0 database persistence with Oracle Fusion Middleware 11g. Those who are already using EJB 3.0 database persistence will learn about using EJB 3.0 database persistence with Oracle Fusion Middleware 11g. We won't be discussing the EJB 3.0 specification in much detail but you can refer - JSR-000220 (http://jcp.org/aboutJava/communityprocess/final/jsr220/index.html) for more information. This book is suitable for professional Java EE developers. The book is also suitable for an intermediate/advanced level course in EJB 3.0. The target audience is expected to have prior, albeit beginner's, knowledge about Java EE, EJBs, EJB 3.0, JSF, ADF Faces, Ajax, Web Services, and XML. The book also requires some familiarity with WebLogic Server and Java EE IDEs, JDeveloper, and Eclipse.
Conventions
In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text are shown as follows: "The Catalog entity bean has properties id and journal".
A block of code is set as follows:
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "In the New Gallery window, select Categories:General | XML and Items:XSL Style Sheet and click on OK".
Note
Warnings or important notes appear in a box like this.
Note
Tips and tricks appear like this.
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Errata
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Questions
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Configuration defaults
Common expected behaviors and requirements for the EJB container are not required to be specified by a developer. For example, by default an EJB 3.0 container provides Container-Managed persistence and Container-Managed Transaction (CMT) demarcation. Default metadata values and programmatic defaults are provided by the EJB 3.0 implementation. A "configuration by exception" approach is taken rather than explicit configuration. Relationship Mapping Defaults are defined in the persistence API. Object/relational mapping defaults are also defined. For example, an Entity bean is mapped to a database table name of the same name as the capitalized entity class name. Therefore, an Entity class Catalog is mapped to database table CATALOG by default. Similarly, the default column name is the property or field name. The entity name defaults to the entity class name.
