shows a simple diagram involving packages The approach taken is that of grouping in Java

Drawer QR Code in Java shows a simple diagram involving packages The approach taken is that of grouping
shows a simple diagram involving packages The approach taken is that of grouping
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like classes in packages
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Figure 8-13 Package dependency
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The package dependency diagrams for the HomeDirect case study are shown in
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Summary
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Use Case Analysis provides an initial, high-level definition of how internal elements interact in order to satisfy the system's functional requirements and how they relate to each other statically This is a fundamental activity on the way to design and development
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Use Case Analysis is supported via sequence diagrams Instead of showing the interaction between actors and a monolithic system, the system is split into analysis level objects The responsibilities of the system are divided among the analysis level objects, which are referred to as boundary, control, and entity objects, to achieve a finer grained sequence diagram Collaboration diagrams are another aid in such analysis
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Once the dynamic behavior has been captured in the form of sequence diagrams and collaboration diagrams, class diagrams can be developed to capture the static relationships between the various elements participating in fulfilling the use case
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Packaging provides a convenient mechanism for managing complexity and allotment of team effort Another critical aspect where packaging can be leveraged deals with understanding the impact of changes in the project via dependency analysis
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9 Overview of J2EE Technologies
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The Big Picture Servlets JavaServer Pages (JSP) Enterprise JavaBeans (EJB) Session Beans Entity Beans Message- Driven Beans Assembly and Deployment Case Study Summary
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Up to this point, we have focused on the Unified Modeling Language (UML) and analysis without giving much thought to the design details of these Java 2 Platform, Enterprise Edition (J2EE) technology components Over the next few chapters, we'll switch gears and move the discussion to a more detailed level to discuss each of the major J2EE component types, highlighting the different roles the UML plays in dealing with them
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In this short chapter, we outline how the different J2EE technologies fit together, and then highlight the contents of the remaining chapters This will allow you to develop a better understanding of the big picture and give you the opportunity to focus your attention only on those chapters that best suit your needs Five different J2EE component types and technologies will be covered in the remaining chapters
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The Big Picture
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Each of the J2EE technologies is intended for a specific purpose and ideally suited for solving specific types of challenges
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Figure 9 - 1
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provides a 50,000-foot view of how the various technologies fit together
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Figure 9-1 The J2EE big picture
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The main point to note is that each technology is designed to be used in a specific tier, and each tier is designed to be very focused on the role that it plays in the overall J2EE application development paradigm This limits the roles individual components can play, even though surpassing these limits may be feasible from a technology perspective
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Servlets
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In
10 ,
we examine these typically compact components Servlets are most often used
as a conduit for passing data back and forth between a Web client and an enterprise application running on a server This is especially true when there are no specific presentation details required of the information being passed back
Servlets come in two flavors: GenericServlet and HttpServlet We discuss both servlet types to a necessary level of technology detail, and then talk about how to model them and gain the most from their UML representation, for ex ample, via modeling of servlet-to-servlet communication, relationships, session management, and so on
This chapter is equally applicable to both J2EE 13 (Servlet specification 23) and J2EE 12 (Servlet specification 22)
JavaServer Pages (JSP)
11 ,
we look at the newer J2EE technology of JSP The key advantage of JSP
technology is that it allows for better separation of presentation content and logic, thereby simplifying development and maintenance
Although JSPs get compiled into servlets, they are best suited to a role that is fundamentally different We discuss this in the context of UML modeling of JSP to understand how to best model this hybrid technology and where to best utilize it
Enterprise JavaBeans (EJB)
s 1 3 , 1 4 ,