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Download Sams Teach Yourself EJB in 21 Days by Ragae Ghaly PDF

By Ragae Ghaly

Sams train your self EJB in 21 Days introduces the advance and deployment points of EJB, the quickest transforming into criteria in constructing Java functions in and firm surroundings. EJBs are, functionally, disbursed community conscious elements for constructing safe, scalable, transactional, and multi-user elements in a J2EE atmosphere. Sams train your self EJB in 21 Days covers the hot positive aspects of EJB 2.0, comparable to neighborhood interface, CMP, and CMR. It presents hands-on examples in line with sensible strategies present in the undefined. tips and top practices provide newcomers an facet to prevent repeated errors. The assessment questions give you the reader with a research advisor. resource code for an entire credits approval technique in a transactional e-Commerce atmosphere is equipped.

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Extra resources for Sams Teach Yourself EJB in 21 Days

Sample text

Understanding EJB Roles The EJB specification defines different roles in the development, assembly, and deployment of enterprise applications. The EJB architecture simplifies the development of complex business systems by dividing this process into six distinct roles, each with a specific task and objectives. These six roles address application development, infrastructure services, and deployment issues. 5 illustrates the different roles involved in developing and deploying EJB components and applications.

Understanding EJB Architecture • Distributed applications: The EJB architecture helps create distributed applications, which can span multiple environments. Each subsystem can work independently of the others, but still can interact with one another to deliver enterprise services to the target users. A user transaction, for example, can be executed across multiple servers within a single context, and will be perceived by the user as a single unit of work. NET. • Application integration: One of the main objectives of the EJB architecture is to allow the integration of new applications with existing applications, such as legacy systems.

3. What are the main differences between EJBs and JavaBeans? 4. What are the common services available to the EJB container? 5. What are all the roles and responsibilities in developing and deploying J2EE applications? WEEK 1 DAY 2 Understanding EJB Types and Interfaces One challenge facing a new Enterprise JavaBeans (EJB) developer is to understand EJB types and interfaces, and how the EJB container performs its functionality behind the scenes. Today, you’ll learn all the different types of Enterprise JavaBeans and their interfaces.

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