文件名称:
Java_-_Expert_One-on-One_J2EE_Development_without_EJB_-_2004_-_Wrox
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文件大小: 7mb
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上传时间: 2010-08-28
详细说明： This is a fairly short book, given its scope, because its subject is less complex than you’ve been led to believe. J2EE orthodoxy makes heavy work of many simple problems. Indeed it sometimes seems that the J2EE industry is committed to the belief that there are no simple problems. Many—probably most—J2EE applications are over-engineered, with unnecessarily complex architectures. Over-engineering can be very costly. J2EE developers tend to assume that increased cost up front will be more than balanced by reductions in future cos ts. Unfortunately, karma doesn’t apply to software engineering, and this is often a fallacy. Greater complexity up front means more code to write and maintain, more potential for bugs, more delay in demonstrating functionality to users: ultimately, greater chance of failure, and at greater cost. J2EE over-engineering usually involves EJB. As I pointed out in Expert One-on-One J2EE Design and Development, EJB is often used inappropriately. This is a real problem, because EJB can introduce more complexity than it conceals. Some services provided by EJB are also overrated. For example, few experienced developers or architects who have worked with entity EJBs to access relational data want to repeat the experience—at least, given the alternatives of JDO, Hibernate, and other transparent persistence technologies. Critiques of EJB have become commonplace since late 2002. It’s easy enough to pick the flaws in an imperfect existing technology, without suggesting alternatives. This book breaks new ground in describing and illustrating better approaches for the majority of J2EE applications that derive no benefit from EJB. This book is no mere theoretical discussion, but a practical guide to designing and implementing high-performance J2EE applications on time and budget. Our suggested architectures are backed up by extensive experience, a realistic sample application, and comprehensive open source solutions that meet typical infrastructure needs. Despite the significant problems that have emerged with EJB, it continues to be adopted too often largely because of fashion and fear. Fashion because even nontechnical managers have heard of EJB and because many books on J2EE architecture barely mention alternatives to EJB for delivering enterprise services, even where excellent alternatives exist. Fear that the alternatives are worse: for example, that without EJB developers will be left to handle complex issues such as transaction management without the training wheels of the EJB container. This book aims to show that these fears are largely unfounded. Where the potential complexity is real, it shows that there are alternatives that do a better job than EJB at addressing the problems concerned. ...展开收缩
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