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Review Best Practices for the Client Tier
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q Thin-client solutions (HTML on a browser) are important to Internet-based
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applications. The browser acts as your client for rendering the presentation as encoded in HTML.
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q In addition to what can be rendered with static HTML, the following items
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can be used to create web content: JSPs, servlets, applets, and JavaScript can be used to enhance the browser interface.
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Enumerate the Components and Categories of the Web Tier
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q The two types of components currently specified for the web tier are servlets
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4: Applicability of JEE Technology
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q Web components are hosted by servlet containers, JSP containers, and web
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containers.
q In addition to standard container services, a servlet container provides
network services by which requests and responses are sent and that decode requests and format responses. All servlet containers must support HTTP as a protocol for requests and responses, but they may also support additional request-response protocols such as HTTPS.
q A JSP container provides the same services as a servlet container and an
engine that interprets and processes a JSP page into a servlet.
q A web container provides the same services as a JSP container and provides
access to the JEE service and communication APIs.
Explain How to Apply MVC to the Web Tier
q MVC is applied to the web tier by separating the application data from the
ways that the data is accessed or viewed. The MVC pattern consists of three component types:
q The Model, usually a JavaBean or an EJB, represents the application data
along with methods that operate on that data.
q The View component, usually a JSP, displays the data to the user. q The Controller, which is usually a servlet, translates user actions such as mouse
movement and keyboard input and dispatches operations on the Model.
Review the Best Practices for the Presentation Layer
q Separate HTML from Java. q Try to place business logic in JavaBeans. q Factor general behavior out of custom tag handler classes. q Favor HTML in Java handler classes over Java in JSPs. q Use an appropriate inclusion mechanism. q Use a JSP template mechanism. q Use style sheets. q Use the MVC pattern. q Use available custom tag libraries. q Determine the appropriate level of XML compliance. q Use JSP comments in most cases.
Two-Minute Drill
q Follow HTML best practices. q Utilize the JSP exception mechanism.
Review the Internationalization and Localization
q The set of political, cultural, and region-specific elements represented in an
application is called a locale. Applications should customize data presentation to each user s locale. Internationalization, also known as I18n, is the process of separating locale dependencies from an application s source code. Examples of locale dependencies include messages and user interface labels, character sets, encoding, and currency and time formats. Localization (also called L10n) is the process of adapting an internationalized application to a specific locale. An application must first be internationalized before it can be localized. Internationalization and localization make a JEE application available to a global audience.
Illustrate When to Use JEE Technology for Given Situations
q With respect to security, an entity is something that can have access rights
applied to it. A principal is an entity to which privileges can be assigned. A role is a collection of privileges.
q Authentication is a mechanism by which callers and service providers
prove that they are acting on behalf of specific users or systems. Webtier authentication consists of HTTP basic authentication, form-based authentication, and HTTPS mutual authentication.
q Authorization entails applying security policies to regulate what specific
users, or groups of users, can access in the system. An access control limits the resources a user can access based on permissions. Access control can also be used to limit the type of access a user has to a resource, such as read or write access. There are two approaches to defining access control rules: capabilities are examined to focus on what a caller can do, and permissions focus on who can do what.
q For proper handling of transactions within the EIS integration tier, it is
recommended that a component uses JTA whenever possible when accessing EIS systems. Using JTA transaction allows multiple components accessing EIS to be grouped in a single transaction. If a component marks the transaction as rollback only, all EIS work will be rolled back automatically.
4: Applicability of JEE Technology
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all the choices carefully because there might be more than one correct answer. Choose all correct answers for each question.
Explain the JEE Architecture and System Requirements
1. Which of the following is not true about JEE containers A. An EJB container manages the execution of all enterprise beans for a single JEE application. Enterprise beans and their accompanying containers run on the JEE server. B. A web container manages the execution of all JSP and servlet components for a single JEE application. Web components and their accompanying container run on the JEE server. C. An application client container manages the execution of all application client components for a single JEE application. Application clients and their accompanying containers run on the JEE server. D. An applet container is the web browser and Java plug-in combination that runs on the client machine. 2. Which statement is not true when discussing the EJB tier A. The Enterprise JavaBeans (EJB) tier hosts the application-specific business objects. B. The Enterprise JavaBeans (EJB) tier does not host system-level services (such as transaction management, concurrency control, and security); they are hosted on the EIS tier. C. The EJB tier is a link between the web tier and the EIS integration tier. D. The EJB tier hosts the entity beans and session beans, data access objects and value objects, and perhaps master-detail modeling using enterprise beans. 3. Which of the following is not true when put in the context of JEE transaction processing A. A compensating transaction is a transaction, or group of operations, used to undo the effect of a previously committed transaction. B. When choosing a transaction attribute, use Required for the default transaction attribute. C. When choosing a transaction attribute, use RequiresNew when the bean methods need to commit unconditionally. D. When using a compensating transaction, it is always possible to undo the effect of a committed transaction.
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