Core J2EE Patterns: Best Practices and Design Strategies
Prentice Hall PTR, 2001 - 459 ページ
Over the last few years, Java 2 Platform, Enterprise Edition (J2EE) technology has emerged and matured as a standard platform for building enterprise applications. While the platform has matured into a solid offering for developing and deploying enterprise applications, it does offer its challenges. As developers, often we confuse learning the technology with learning to design with the technology. In this book, senior architects from the Sun Java Center, Sun's Java consulting organization share with the reader their cumulative design experience with and expertise on J2EE technology.
The primary focus of the book is on patterns, best practices, design strategies, and proven solutions using the key J2EE technologies including JavaServer Pages (JSP), Servlets, Enterprise Java Beans (EJB), and Java Message Service (J.M.S) API. Other ancillary technologies like JDBC and JNDI are also discussed as relevant to their usage in these patterns. The J2EE Patterns catalog with 16 patterns and numerous strategies is presented to document and promote best practices for these technologies.
In addition to the patterns and strategies, the book offers the following:
Core J2EE Patterns delivers:
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The Command object uses the method shown in Example 5.4, also excerpted
from its superclass (the Action class again), to compare the values. Example 5.4
Check For a Valid Token I * * * Return <code>true</code> if there is a transaction
Another issue is the inability for the entity bean to demarcate a transaction. When
using entity beans, you are only allowed to have container-managed transactions
. This means that, depending on the transaction attribute of the entity bean ...
An update transaction can resolve conflicts using the time stamp or version
number attribute. If a client holding a stale value object tries to update the entity,
the entity can detect the stale version number or time stamp in the value object
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J2EE Platform Overview
Design Considerations Bad Practices and Refactorings
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