A Field Guide To Integrating Xml And Web Services by Thomas Erl

By Thomas Erl

As XML turns into an more and more major a part of the IT mainstream, specialist counsel and commonsense thoughts are required to prevent the various pitfalls of making use of XML incorrectly or permitting it for use in an out of control demeanour. This e-book acts as a data base for concerns with regards to integration, and offers transparent, concise suggestion on how you can top ensure the way and path XML expertise might be located and built-in. The booklet should be one of many first to supply documentation for second-generation internet companies applied sciences (also referred to as WS-*). the significance of those necessities (which contain BPEL, WS-Transaction, WS-Coordination, WS-Security, WS-Policy, and WS-Reliable Messaging) can't be understated. significant criteria corporations and proprietors are assisting and constructing those criteria. ***David Keogh, application supervisor for company Frameworks and instruments, Microsoft, will offer a entrance disguise citation for the ebook.

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If you want to execute this sample, download the zip containing code examples from www. com/panda and follow the online instructions to deploy and run it in your favorite EJB container. However, don’t worry too much about the details of this code right now; it’s just a simple illustration. We’ll dive into coding details in the next chapter. Our intent for the Hello World example is to use it as a basis for discussing how EJB 3 addresses the thorniest issues that branded EJB 2 as ponderous. Let’s move on now and take a look at what has transformed the EJB elephant into the EJB cow.

If you’ve worked with JDBC, you know that a “provider” is essentially the vendor implementation that the JDBC API uses under the covers. Products that provide JPA implementation are persistence providers or persistence engines. JBoss Hibernate and Oracle TopLink are two popular JPA providers. Getting inside EJB 21 Since JPA is completely pluggable and separable, the persistence provider and container in an EJB 3 solution need not come from the same vendor. For example, you could use Hibernate inside a BEA WebLogic container if it suits you better, instead of the Kodo implementation WebLogic ships with.

She could have reused it without having to understand its implementation. Given that, building a reusable component requires careful planning because, across enterprise applications within an organization, very little of the business logic may be reusable. Therefore, you may not care about the reusability of EJB components, but EJB still has much to offer as a framework, as you’ll discover in the next section. 1 EJB allows development of reusable components. For example, you can implement the credit card–charging module as an EJB component that may be accessed by multiple applications.

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