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1.2.2 November 1999: EJB 1.1
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In November of 1999, Sun released the first minor revision to the EJB specification to an eager community. For the first time, it mandated support for entity beans, the component model that provides EJB persistence. The new specification also added much needed support for XML and moved deployment descriptors from proprietary serialized objects to open XML documents. The security model was strengthened. Industry consultants lauded EJB as ready for the big time. As EJB 1.1 was being developed, the Java language was making headway into the enterprise. Mainstream enterprise developers, looking for relief from tedious, distributed application development issues like security and transaction management, turned to EJB for solutions. Yet, as the first wave of real customers began to use EJB, they stumbled onto these major problems:
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Objects in a container did not have local interfaces. That meant that components had to use expensive communication alternatives to collaborate, with severe performance penalties. Entity beans did not have a way to represent or capture relationships. Because EJB typically were deployed on relational databases, database performance became problematic. Relational databases could process relationships in the form of joins many times faster than an application, but without
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relationship management, EJB developers were forced to process relationships within the application.
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Stateful session beans provided only a limited implementation that could not be clustered. No messaging application programming interface (API) existed, meaning that all communications had to be synchronous. The adoption of the entity bean specification further compromised portability.
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EJB developers were beginning to get the picture: EJB would allow you to do enter-
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prise applications with distributed objects, but would in no way guarantee good performance. We began to see best practices appear in many different places. Ironically, many best practices were simply remedies for problems that existed in the frameworks. Others provided solutions to common performance problems inherent in any distributed system. Readers of Bitter Java recognize these programming traps as antipatterns. The J2EE community was growing so rapidly that many sample applications and early tutorials created in the formative Java years were never updated sufficiently to take advantage of the J2EE best practices. As with any new promising complex technology, many projects failed to take advantage of new optimizations. The seeds were sown for a future EJB backlash.
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1.2.3 August 2001: EJB 2.0
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Under increasing pressure from competition, economic downturns, and customers, Sun released EJB 2.0, with many enhancements that we use today. Currently, local interfaces enable both local and distributed component models, creating huge performance boosts. Relationship management and EJB QL allow relational databases to process entity queries with joins in the database, instead of in the applications. Message-driven beans (MDBs) now permit both synchronous and asynchronous communications. The specification is good enough to provide the following significant advantages:
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You can build enterprise applications with EJB that can scale and perform. Notable enterprises have built and deployed significant applications on EJB with impressive throughput and reliability.
J2EE, for the most part, supports the critical legacy components. You can
access relational database data, integrate with third-party transaction monitors (with a little extra effort), build a unified security policy with a central directory, and integrate with key message-oriented middleware vendors.
A case study: Benchmarking PetStore
While EJB 2.0 does not have perfect portability, skills do transfer pretty well across J2EE platforms. J2EE skills are available and, at least for the short term, relatively affordable.
J2EE has a viable economy, outside traditional application server vendors.
Consulting companies, like the Middleware Company, can provide effective education and third-party services. Other companies, like Sonic and Precise, produce components, middleware, and tools.
The Open Source community for J2EE is thriving. A full-fledged EJB server in JBoss has many features that the commercial counterparts don t yet support. Industry support for EJB is as strong as ever, with IBM and BEA now carrying the torch from a product perspective and a wide community contributing to the open Java community process (JCP), which forms the standards.
The J2EE community is now large enough to support several highly successful portals such as TheServerSide.com and IBM s developerWorks. Communities like these post and discuss J2EE news and developments. At TheServerSide.com, you can find highly charged political conversation, ask or answer development questions, and check out reviews of the major application servers. At developerWorks, you can find articles from some of the best Java developers in the world, with free downloads. While EJB has turned the corner in some ways, we re still wandering in the wilderness in others. The specification continues to leave a whole lot of discretion to individual vendors, so we don t yet have a portable standard. Though effective for a set of problems, EJB is undoubtedly highly complex. As we write this in early 2003, we re also seeing a meaningful backlash against all things related to EJB. The trigger, this time, is performance and complexity.
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