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q The web tier is the tier within an enterprise system that contains the
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q Web tier components include servlets, JavaServer Pages, and JavaServer
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q The business tier is the tier within an enterprise system that contains the
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q Business tier components include Enterprise JavaBeans. q The EIS tier is the tier within an enterprise system that contains the data
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layer.
q EIS tier activities include persistence support through database management
systems.
Understanding Server-Side Solutions
q The Simple Object Access Protocol (SOAP) is a protocol used for information
exchange within a decentralized and distributed environment.
q The Universal Description, Discovery, and Integration (UDDI) specification
is an XML-based registry that is used by businesses to make their services and general business descriptions available through the Internet.
q The Web Service Definition Language is an XML standard for businesses and
individuals to access available services that each provides.
q The Extensible Markup Language is a general-purpose specification used for
creating markup languages.
q The Simple Mail Transfer Protocol (SMTP) is a protocol for sending mail. q The JavaMail API is a framework that provides electronic mail functionality. q The Java API for XML-based Remote Procedure Call (JAX-RPC) is an API
used to build remote procedure calls in order to build web services and clients.
12:
Understanding Server-Side Technologies
Understanding Dynamic Web Content Solutions
q Servlets provide a pure-Java program that functions in response to an HTTP
request.
q JavaServer Pages (JSPs) provide a dynamic web content solution that uses
template data and custom elements to expedite and ease the development of the presentation layer.
Understanding Enterprise Business logic Solutions
q The session bean is a type of EJB that performs methods for a client. q There are stateful and stateless session beans. q A stateful bean maintains a conversation state for the client, while a stateless
bean does not.
q The entity bean is a persistent type of EJB that is typically associated with
a table in a relational database.
q The message-driven bean is a type of EJB that processes messages
asynchronously, acting as a JMS listener.
Self Test
SElF TEST
Understanding Java EE Related Tiers and Technologies
1. Which attributes are representative of the Java EE architecture A. Secretiveness, security, and manageability B. Extensibility, morphability, and availability C. Reliability, availability, and marketability D. Scalability, flexibility, and security 2. Which two are responsibilities of the business tier A. The business tier may manage the execution of EJBs. B. The business tier may include message-server beans. C. The business tier may include legacy systems. D. The business tier may include stateless session beans. 3. Which two are responsibilities of the web tier A. The web tier may include mainframe transaction processing systems. B. The web tier may include presentation logic. C. The web tier may include controller logic. D. The web tier may include entity beans. 4. Which two are responsibilities of the EIS tier A. The EIS tier may include relational databases. B. The EIS tier may include EJBs. C. The EIS tier may include enterprise-resource planning systems. D. The EIS tier may include JavaBeans components.
Understanding Server-Side Solutions
5. Which API uses remote procedure calls to build web services and clients A. JNDI B. JMS C. JAX-RPC D. SMTP
12:
Understanding Server-Side Technologies
6. The DTD Schema is used to validate the structure of which type of documents A. HTML B. XML C. JavaScript D. JavaServer Pages 7. Which technology provides a standardized format for describing a web service A. SOAP B. UDDI C. JSTL D. WSDL
Understanding Dynamic Web Content Solutions
8. Which Java EE technologies provide dynamic web content solutions A. Servlets B. Adobe Coldfusion C. Perl D. JavaServer Pages E. Microsoft Active Server Pages 9. Which of the following are JavaServer Pages translated into A. JavaScript B. XML C. JavaBeans D. Servlets 10. Which are some of the benefits of JavaServer Pages A. JSP technology is open source. B. JSP pages are platform-independent. C. JSP allows for the separation of presentation logic from business logic. D. JSP technology provides a fast development approach for building web applications. E. All of the above.
Self Test
Understanding Enterprise Business logic Solutions
11. Which statement is false about session beans A. Session beans act as JMS message listeners. B. Session beans can only have one client. C. Session beans are not persistent. D. Session beans exist as two types: stateless and stateful. 12. Which statement is false about entity beans A. Entity beans are persistent. B. Entity beans have primary keys. C. Entity beans allow shared access. D. Entity beans cannot interact with other entity beans. 13. Which statement is false about message-driven beans A. Message-driven beans are short-lived. B. Message-driven beans have state. C. Message-driven beans act as JMS message listeners. D. Message-driven beans are used to receive messages asynchronously.
12:
Understanding Server-Side Technologies
SElF TEST ANSWERS
Understanding Java EE Related Tiers and Technologies
1. Which attributes are representative of the Java EE architecture A. Secretiveness, security, and manageability B. Extensibility, morphability, and availability C. Reliability, availability, and marketability D. Scalability, flexibility, and security Answer:
3 D . Scalability, flexibility, and security are all strong attributes of a Java EE system.
A, B,and C are incorrect. Secretiveness, morphability, and marketability are not attributes of a Java EE system. 2. Which two are responsibilities of the business tier A. The business tier may manage the execution of EJBs. B. The business tier may include message-server beans. C. The business tier may include legacy systems. D. The business tier may include stateless session beans. Answer:
3 A and D. The business tier manages the execution of EJBs, including stateless (and stateful) session beans.
and C are incorrect. B is incorrect because there is no such thing as message-server B beans, but there are message-driven beans. C is incorrect because legacy systems typically reside in the EIS tier, not the business tier. 3. Which two are responsibilities of the web tier A. The web tier may include mainframe transaction processing systems. B. The web tier may include presentation logic. C. The web tier may include controller logic. D. The web tier may include entity beans.
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