Challenges in Modeling J2EE in the UML in Java

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Challenges in Modeling J2EE in the UML
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One of the authors recalls trying to replace a leaky rear differential seal on his car The repair manual called for a specialized tool to remove the seal, but he took one look at it and decided the job could be done with his wrench set and pliers He eventually managed to replace the seal, but it took him weeks, and somehow the oil never stopped leaking!
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The challenge in using unadulterated UML for J2EE modeling is somewhat similar You may get the job done, but your efficiency and likelihood of success will be diminished
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More specifically, the specifications that make up the J2EE offer some distinct modeling challenges, for instance:
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An Enterprise JavaBean (EJB) class implements the business methods in the Remote interface, but not the interface itself This is contrary to the standard UML concept of interface realization
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An EJB, by definition, is related to a Home and Remote interface It is necessary that a UML modeler consistently honor this architectural pattern
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Servlets and EJBs have deployment descriptors associated with them Unlike most other Java classes, EJBs, servlets, and JSPs are packaged in a specific type of archive file along with their deployment descriptors
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Entity bean attributes map to elements in a database EJBs have the notion of transactions and security Session EJBs can potentially have significant dynamic behavior Different persistence schemes can be employed by entity beans JSPs are logically a hybrid in that they have both client and server aspects to them
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Given the drive to deliver better software in less time, another objective in modeling J2EE is to be precise enough to permit UML-based modeling tools to be able to process your model and provide value-added capabilities related to J2EE
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Extension Mechanisms in the UML
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We are quite sure the cre ators of UML did not have J2EE on their minds when they created the UML Fortunately for us, they had enough foresight to recognize that in order for the UML to last any length of time, it would have to be capable of evolution and adaption to new languages and constructs
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The UML provides three mechanisms for extending the UML: stereotype, tagged value, and constraint
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Stereotype
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A stereotype allows you to create a new, incrementally different model element by changing the semantics of an existing UML model element In essence, this leads to the addition of new vocabulary to the UML
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In the UML, a stereotyped model element is represented by the base model element identified with a string enclosed within a pair of guillemets ( ) A pair of angle brackets (<< or >>) can also represent a guillemet
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The use of stereotypes is fairly common in everyday UML usage, and it is quite acceptable to create stereotypes to model concepts/constructs if the stereotype adds clarity As an example, the UML itself describes the extend and include relationships via the <<extend>> and <<include>> stereotypes
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A stereotype can be defined for use with any model element For instance, stereotypes can be used with associations, classes, operations, and so on An example of a stereotype is shown
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in Figure 3 -1 A stereotype may optionally be shown via an icon An example is shown inFigure 3 -2 Note that
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Figure 3 - 1
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Figure 3 - 2
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are equivalent We make extensive use of the iconic
representation in this book
Figure 3-1 A class with stereotype
Figure 3-2 Representing an interface using an icon
Tagged Value
UML model elements typically have properties associated with them For ex ample, a class has a name A tagged value can be used to define and associate a new property for a model element in order to associate additional information to the model element
A tagged value is d efined as a tag, value pair in the following format: { tag=value} For instance, the UML construct class has a name, but normally there is no way to identify the author of the class A tagged value of { author=Khawar} could be used to associate the author's name to the class model element
An example of a tagged value is shown in Figure 3 - 3