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 information and common sense thoughts are required to prevent the various pitfalls of using XML incorrectly or permitting it for use in an out of control demeanour. This booklet acts as a data base for matters with regards to integration, and gives transparent, concise recommendation on tips to top ensure the way and path XML know-how will be situated and built-in. The e-book might be one of many first to supply documentation for second-generation internet prone applied sciences (also often called WS-*). the significance of those standards (which contain BPEL, WS-Transaction, WS-Coordination, WS-Security, WS-Policy, and WS-Reliable Messaging) can't be understated. significant criteria firms and owners are helping and constructing those criteria. ***David Keogh, application supervisor for company Frameworks and instruments, Microsoft, will supply a entrance disguise citation for the publication.

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Also, because of the very nature of standardsbased development, the quality of EJB 3 container implementations is generally not taken lightly by vendors. To some degree, this helps ensure a healthy level of inherent implementation quality. Clustering, load balancing, and failover Features historically added by most application server vendors are robust support for clustering, load balancing, and failover. EJB application servers have a proven track record of supporting some of the largest high-performance computing (HPC)-enabled server farm environments.

3 Gaining functionality with EJB services The first thing that should cross your mind while evaluating any technology is what it really gives you. What’s so special about EJB? Beyond a presentation-layer technology like JSP, JSF, or Struts, couldn’t you create your web application using just the Java language and maybe some APIs like JDBC for database access? The plain answer is that you could—if deadlines and cutthroat competition were not realities. Indeed, before anyone dreamed up EJB this is exactly what people did.

Here’s another perfectly valid (and often simplerto-understand) way of looking at entities: they are the OO representations of the application data stored in the database. In this sense, entities survive container crashes and shutdown. You must be wondering how the persistence provider knows where the entity will be stored. The real magic lies in the ORM metadata; an entity contains the data that specifies how it is mapped to the database. You’ll see an example of this in the next chapter. JPA entities support a full range of relational and OO capabilities, including relationships between entities, inheritance, and polymorphism.

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