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IBM scrapped VisualAge, supported the open source Eclipse project, and
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bought Rational. How will this impact current Rational customers with competing development environments
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To accelerate the market acceptance of its J2EE application server, Oracle bought the industry s leading relational mapping software just as WebGain was dissolving. Will Oracle continue to support TopLink customers with WebLogic or DB2
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BEA, once the runaway market leader, now faces growing competition from IBM. Is BEA still the obvious J2EE choice
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The Open Source community has a rapidly growing footprint that s gaining traction outside of the web server market, with smash hits like Ant for builds, Tomcat as a servlet engine, and JBoss as a viable full-service J2EE server. Do you need to pay for an application server to get value
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Along this journey, J2EE is predictably taking some lumps. Early versions of EJB had significant problems. Compatibility was nowhere near what customers
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Bitter choices
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expected. The open standards often evolve much more slowly than their proprietary counterparts. Customers report growing complexity and a high failure rate. External competition, too, is growing. Behind the marketing muscle of Microsoft, .NET is growing rapidly and is directly attacking J2EE s market share. As we write this, J2EE is under a cloud of controversy and scandal. The community is buzzing over a recent benchmark that showed .NET with a performance lead over J2EE. Critics rightfully claim that the comparison isn t accurate or fair, but gave Microsoft a much-needed infusion of credibility. Under these storm clouds, we write Bitter EJB. It s not our intent to further sow the seeds of dissention. Each Bitter EJB author is a strong proponent of J2EE and EJB, who also feels that EJB are complex and prone to misuse. By exploring antipatterns, we d like to give you the tools to effectively navigate the stormy waters as a software architect or as a programmer. In the next section, we ll take a brief tour through the evolution of EJB. By doing so, we ll gain some insight into the problems that EJB developers encounter. We ll also have a better appreciation for the tradeoffs made by the fathers of EJB.
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1.2 A history of EJB antipatterns
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Like many ambitious technologies, EJB started with a bang. If you d like to amuse yourself, search the Internet to see what people were saying about EJB in 1998 and 1999. We were truly enamored by the possibilities of EJB. The robust infrastructure promised unprecedented security. With a new portable component model, the industry would agree on standards and compete on price. We would soon buy components from a global software EJB component marketplace, and we would choose from a variety of vertical applications that would simply snap into our waiting application servers. With such a head start, we would build enterprise applications in weeks instead of years. Thus simplified, operations personnel would handle menial tasks like enterprise application development, saving Java application developers for important tasks like going to meetings and drinking beer. In all fairness, we were greatly encouraged in our high hopes. The industry, fearful of Microsoft s toehold on server-side application development, supported EJB with a tremendous amount of muscle and enthusiasm. Oracle, Sun, and IBM formed the front line of support that would eventually drive EJB into the fabric of corporate server-side development. To fully understand the evolution of EJB use, let s look at the history of the EJB specifications.
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A history of EJB antipatterns
1.2.1 March 1998: EJB 1.0
Behind the scenes EJB has always existed in a near continuous state of controversy. Right out of the chute, Oracle refused to support the EJB persistence model. The other major players compromised with Oracle to make entity bean support optional. Data persistence wasn t the only early problem. The EJB specification left too much room in each implementation, so that the promised portability not to mention server-to-server compatibility never materialized. While the EJB marketing engine was in overdrive, the real world was having mixed results with its product. While a few excited customers began to play with the technology, the technology was much too young to be seriously considered by most customers. The rare early applications ran with significant performance problems and fell short of the promised reality. Some vendors, including IBM, had a hard time releasing critical products on schedule. Others had difficulty getting early customers to adopt EJB. In general, the complexity of the early specifications frustrated all but the most seasoned developers. The best practices and expertise that we now take for granted took time to build. The result of EJB s first release was a hopeful marketplace with limited real-world success.
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