Beginning J2EE 1.4: From Novice to Professional (Apress by James L. Weaver

By James L. Weaver

*This ebook is greater than easily a reprint of fabric already freely to be had on the net (I’m you, The J2EE Tutorial).

* Concentrates at the components of J2EE that readers locate best, obtainable, and appropriate for the beginning in their specialist profession – JSP and Servlets, instead of intensive assurance of EJB―helps reader accomplish whatever and will spark curiosity for additional exploration of J2EE.

* This name will pay attention to internet improvement (using JSP and Servlets) yet nonetheless be geared toward programmers who are looking to turn into J2EE builders – so it is going to be a identify for the Java class, no longer JavaServer Pages.

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Extra info for Beginning J2EE 1.4: From Novice to Professional (Apress Beginner Series)

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I present them here to illustrate that there are a number of ways to put together applications and as a short “field guide” for identifying these architectures as you spot them in the wild. n-Tier Architecture n-Tier application architecture is intended to address a number of problems, including: ❑ High cost of maintenance when business rules change ❑ Inconsistent business rule implementation between applications ❑ Inability to share data or business rules between applications ❑ Inability to provide web-based front ends to line-of-business applications ❑ Poor performance and inability to scale applications to meet increased user load ❑ Inadequate or inconsistent security across applications Two tier applications address sharing of data between applications and, to a lesser degree, touch on performance scalability, but do not address any of the other concerns.

Transaction Support One of the basic requirements of enterprise applications is the ability to allow multiple users of multiple applications to simultaneously access shared databases and to absolutely ensure the integrity of that data across those systems. Maintaining data consistency is no simple thing. qxd 15/1/04 7:28 pm Page 20 Chapter 1 Suppose that your application was responsible for processing bank deposits, transfers, and withdrawals. Your application is processing a transfer request from one account to another.

Java API for XML Processing (JAXP) provides support for generating and parsing XML with both the Document Object Model (DOM), which is a tree-oriented model, and SAX (Simple API for XML), which is a stream-based event-driven processing model. The Java API for XML Binding (JAXB) provides support for mapping XML to and from Java classes. It provides a compiler and a framework for performing the mapping so you don’t have to write custom code to perform those transformations. The Java API for XML Registries (JAXR), Java API for XML Messaging (JAXM), and Java API for XML-based Remote Procedure Calls (JAX-RPC) round out the XML API provisions.

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