Borland Application Server Certification. Study Guide. Version 1.0 Copyright 2001 Borland Software Corporation. All Rights Reserved.
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1 Borland Application Server Certification Study Guide Version 1.0 Copyright 2001 Borland Software Corporation. All Rights Reserved.
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3 Introduction This study guide is designed to walk you through requisite information to become certified in Borland Application Server. The material in this document is organized in the following four sections: Test Overview describes the rules and the organization of the test Technical Resources recommends training courses, books and manuals that can help acquire the knowledge required to pass the test Test Sections lists topics tested in each test section Sample Questions provides sample questions with answers Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 1
4 Test Overview General Details The test is organized as follows: Online test (hosted by Prometric Prime web based testing system) Maximum time allowed for test is 60 minutes Test will contain 60 questions (total pool of questions is several hundred) Minimum score required to pass is 80% ( = 48 or more correct answers) All test questions are multiple choice. Most questions are of a multiple choice / single answer type. Some questions are multiple choice / multiple answer type. No partial credit is given for the latter type of question. All test questions are equally weighted, and thus count equally toward the final score. Organization of Questions The test questions are grouped into the following sections of knowledge: EJB Architecture EJB Clients Entity Beans Entity Bean Relationships Session Beans Error Handling Transactions Servlets Java Server Pages Security VisiMessage Each section contains a large pool of questions. At least one question is randomly chosen from each section. Every iteration of the test contains the same number of 2 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
5 questions from each section. We do not provide the actual number of questions per section. Notice that some subject areas are considered to be advanced topics, for instance, transactions or security service. Although questions are asked on advanced topics, the questions themselves test fundamental knowledge of these topics. Thus a fundamental understanding and familiarity of advanced BAS topics is necessary for successful Borland Application Server Product Certification. Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 3
6 Resources Training Course J2EE Application Development with Borland Application Server. A 4.5- day instructor led course available through Borland Training. Delivered by Borland Certified Instructors. See for details. On-line Documentation Borland AppServer 4.5 Documentation. ndex.html. Borland Security Service Guide. ml. Borland Application Server FAQ. J2EE Specifications. In particular: Books Java 2 Platform, Enterprise Edition Specification, Version 1.2 Enterprise JavaBeans Specification, Version 1.1 Java Servlet Specification, Version 2.2 JavaServer Pages Specification, Version 1.1 Nicholas Kassem (Editor). Designing Enterprise Applications with the Java(tm) 2 Platform.Enterprise Edition. Addison-Wesley, Richard Monson-Haefel. Enterprise JavaBeans. 2nd edition. O'Reilly & Associates, Vlada Matena, Beth Stearns. Applying Enterprise JavaBeans(tm): Component-Based Development for the J2EE(tm) Platform. Addison- Wesley, Marty Hall, Core Servlets and JavaServer Pages (JSP). Prentice Hall PTR/Sun Microsystems Press, Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
7 Test Sections EJB Architecture This section tests the candidate s knowledge of the basic EJB concepts that are common for both EJB types (session and entity beans). EJB client-view contract. You should know what are the roles of EJB home and remote interfaces and what are their required base interfaces. You should be able to draw an inheritance diagram for a home and a remote interface of an EJB. RMI and RMI-IIOP restrictions for remote and home interfaces. You should know what kind of limitations are imposed on home and remote interfaces due to RMI and RMI-over-IIOP mechanisms. Required relationships between EJB interfaces and EJB classes. You should know how methods of a remote interface are mapped to methods of the corresponding bean class. Programming restrictions for EJB classes. You should know what kind of operations are illegal in methods of EJB classes and you should be able to explain why such restrictions exist. EJB stubs and skeletons. You should be familiar with the concepts of stubs and skeletons and their roles in making remote invocations. You should know how to use the iiop2java compiler to produce stubs and skeletons for an EJB (what does it take as an input and what is the default outcome of the compilation?). EJB Object and EJB Home. You should have a thorough understanding of the roles of EJB Object and EJB Home objects, and when the code of these objects is generated. Obtaining information about EJB execution context. You should know what an EJB context is and what an EJB instance can discover using the EJB context object. You should know about the Environment Naming Context (ENC) and its structure (recommended by the EJB specification) and what information about the EJB environment is typically stored in the ENC. JAR files. You should be familiar with the required contents of an EJB JAR file and the process of its installation in a BAS server instance. You are required to know what BAS services are updated when a JAR file is being deployed in the EJB container. Be prepared to characterize different variants of distribution of cooperating EJBs (in the same JAR file, in Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 5
8 different JAR files deployed in the same container, in different JAR files deployed in different containers). Stand-alone EJB containers. You are expected to be familiar with advantages and disadvantages of using stand-alone BAS EJB containers (i.e. containers running outside of a BAS server), to be able to explain when stand-alone containers are useful, and to know how to start a standalone BAS EJB container. EJB Clients This test section verifies your knowledge of the mechanics of how a client uses EJBs: obtaining the home interface, using the home interface and the remote interface. Locating EJBs. This group of questions tests your generic knowledge of JNDI and how it is used to advertise and locate EJBs. Besides being familiar with generic naming service concepts, such as contexts and bindings, you need to know what information is advertised within a naming service for an EJB and how this information is obtained by a client program. Be familiar with how typical naming service related tasks can be performed like: obtaining an initial naming context, narrowing results of JNDI lookups in a client program, etc. Using EJB interfaces. You are expected to know the semantics and purpose of all methods of the javax.ejb.object and javax.ejb.home interfaces. For instance, all ways of removing an EJB, what information can be obtained using the EJBMetaData interface, and how to properly compare EJB references. EJB handles. You should be familiar with the concept of EJB handles and know how and when to use them. You need to be aware of differences between handles and primary keys of entity beans. Entity Beans This test section verifies your understanding of and ability to use entity beans. Applicability of entity beans. Be prepared to explain what entity beans should be used for and in which circumstances they are not suitable. Container-managed persistence (CMP) and bean-managed persistence (BMP). You are expected to recognize and distinguish the advantages and disadvantages of CMP and BMP. You should know how EJB classes developed to support CMP differ from bean classes supporting BMP. Be prepared to characterize the portability of EJB classes for CMP in EJB Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
9 Design issues for entity bean remote interfaces. Know how Java Beans conventions can be used when defining interfaces of entity beans (conventions for names of setter and getter methods) and what are the benefits from using these conventions. Primary keys. You should be able to describe the requirements for the user-defined primary key classes; what methods should a primary key class provide, regardless of the persistence type; what primary key class methods are required in BAS for CMP-based entity beans; what methods are not required, but useful for debugging and tracing. You also need to know what single-field primary keys are and what data types are allowed for single-key primary keys. Home interfaces for entity beans. You should know the specific requirements for home interfaces of entity beans, e.g. the required numbers of create and finder methods, the difference between single-entity and multi-entity finder methods, etc. Requirements for entity bean classes. Be familiar with specific requirements for bean classes implementing CMP and BMP entity beans. In particular, you should know what methods of entity bean classes are required and their signatures. Entity bean life cycle. You should have a very good understanding of an entity bean instance life cycle and know when various methods of a bean class are invoked during the instance s life cycle. You should be able to explain how the EJB container manages entity bean instances using instance pooling, when entity beans are created/removed, when entity bean instances are created/removed and when the database is contacted. Study the UML sequence diagrams illustrating the life cycle of an entity bean instance. These diagrams can be found in the EJB 1.1 specification or in other books and resources recommended by this study guide. Entity bean deployment descriptor. You are expected to know how to declare an entity bean in a BAS deployment descriptor. In particular, you should know how to define the mapping of CMP fields to database tables and columns. Entity Beans Relationships The CMP engine in the BAS EJB container provides powerful mechanisms supporting complex relationships between CMP-based entity beans. This section verifies your ability to use these BAS features. Supported types of relationships. You are required to know what types of relationships between entity beans are supported in BAS. Implementing relationships. You need to know how relationships of different cardinalities (1-1, 1-n, n-m) can be modeled with EJBs; what the Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 7
10 development and deployment steps are required to construct such relationships. In particular, you should know the role of finder methods in implementing relationships and learn how to define finder methods that search database tables of other entity beans. Study the EJB School example, provided with the BAS installation. Multi-table mapping. You are required to know how to map an entity bean to multiple tables in the database. Dependant objects. You should be familiar with the concept of dependant objects (of entity beans) and know what kind of relationships BAS supports between entity beans and dependant objects and how to implement them. Study the Instructors EJB example provided with the BAS installation. Session Beans This section tests your knowledge of stateless and stateful session beans. Applicability of session beans. Know what session beans should be used for. Façade design pattern. Know about how to use a session bean as a façade encapsulating other EJBs and what are the benefits of this approach. Stateless and stateful session beans. You should be able to define stateless and stateful session beans. Know how client s perspective differs when using stateful session beans compared to stateless sessions beans. Home interfaces for session beans. You should know the required contents of home interfaces for stateless sessions beans and for stateful session beans and what the requirements are regarding the number of create methods and their signatures for session beans of either type Life cycle of session beans. It is essential you understand how the EJB container can manage session bean instances (of both types) and the life cycle of session bean instances. Study the UML sequence diagrams illustrating the life cycles of stateless and stateful session bean instances. Know about the process of passivation and activation of stateful session beans and instance pooling applied for stateless session beans. Make sure you are familiar with the different timeout parameters that can be used to control stateful session bean instances and how to configure them. Information about how session bean instances are managed by BAS can be found in EJB Programmer s Guide and BAS FAQ. Exceptions This test sections verifies your knowledge of EJB exceptions and your ability to define and handle exceptions in EJB classes and client applications. 8 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
11 Container policies for application exceptions. It is essential you understand what happens when a bean method throws an application exception: how it affects the current transaction and the bean instance s life cycle, and what exception is ultimately passed to the client. Container policies for system exceptions. You should know what happens when a bean method throws a system exception: how it affects the current transaction and the bean instance s life cycle, and what exception is ultimately passed to the client. Exception design issues. Know the guidelines for exception handling in bean classes. What a bean class method should do when it encounters an exception condition. Understand the differences between the various exception types (recoverable exception and unrecoverable exceptions, system exception and application exceptions). When should exceptions be translated and how. How application exceptions should be defined. Transactions This section tests your overall knowledge of transactions in J2EE and EJB. Transaction attributes. Know the definition of each Transaction Attribute value. Know when these values are appropriate and how they affect the coordination of transactions performed by the transaction engine. Know which methods of an EJB require transaction attributes. BAS transaction engines. You should be able to characterize the two different transaction managers that come with BAS-Lite Transaction Manager and VisiTransact Transaction Manager. Be able to compare their applicability. Make sure you know which transaction engine is the default. Information about BAS transaction managers can be found in Chapter 3 of the BAS Programmer s Guide. Database isolation levels. Know the definition each database isolation level. Know how they can be controlled (both programmatically and declaratively). Optimistic concurrency. Be familiar with the concept of optimistic concurrency. Be able to define different values of the optimistic concurrency behavior supported in BAS. Know what is the default behavior. You need to be able to describe how transaction serialization can be guaranteed by controlling the optimistic concurrency behavior option. You might be asked to compare this technique with using the database isolation to ensure transaction serialization. The information about optimistic concurrency policy can be found in chapters 7 and 9 of the EJB Programmer s Guide. Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 9
12 Commit modes. Know the three different types of commit modes as defined in the EJB specification and supported in BAS. You are expected to be able to characterize the performance of the container in each mode. Bean-managed transactions. You should be able to explain when beanmanaged transactions can be used (for which EJB types) and when they are useful. Servlets In this section of the test you will be required to demonstrate your knowledge of the servlet technology. Legacy technologies for dynamic web page generation. This subgroup of test questions tests your overall knowledge of legacy technologies and how they were used to create dynamic web pages before servlets were invented. You should be able to identify the disadvantages of Common Gateway Interface (CGI) and binary interfaces (e.g. NSAPI) and explain how these are overcome by servlets. Comparison of Java client technologies. You should know the similarities and differences between servlets, applets and stand-alone client applications. You need to be able to compare advantages, drawbacks and applicability of all these approaches. Servlet threading strategies. It is essential you understand threading issues for servlets. Know what the default threading strategy for servlets is. Know how synchronization issues should be handled when developing single-threaded servlets and multi-threaded servlets. Know how the resource management strategy implemented by the container for servlet instances depends on the servlet threading policy. Generic servlets. You should know what protocols servlets can process and how the GenericServlet class can be used to implement servlets processing various protocols. Know what this class defines. HTTP servlets. You are expected to know how to develop servlets for the HTTP protocol. Know what HTTP messages are typically processed by HTTP servlets and the appropriateness of different HTTP message types (e.g. what are the limitations of GET HTTP messages). Know under what circumstances a browser sends these various HTTP messages. Be able to describe the interface and functionality of the HTTPServlet class. Web application units. You are expected to know how to create WAR deployment descriptors and WAR files. You should know the required contents of a WAR file and a WAR deployment descriptor. Know what the servlet context and context root are. Know how different servlet context objects may be accommodated in the web container. 10 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
13 Java Server Pages This section tests you knowledge of Java Server Pages. JSPs as servlet templates. You are expected to know the basics of JSPs: what are they and what is their relationship to servlets. Object scopes. Know how various Java objects can be created within a JSP and the different scopes they can be assigned. Know what are the available scopes. Know when objects are destroyed depending on their scope. Predefined objects. Know what predefined objects are available within a JSP, and what their scope is. Be familiar with situations where these predefined objects could be useful. Scripting elements. Know what JSP scripting elements are, and which of them define local variables and which define servlet class data members. Using JavaBeans. Learn all JSP syntax elements that support Java Beans. Know how JavaBeans are typically used in JSPs, and how they are created and initialized. Security This section of the test aims at testing your understanding of J2EE security issues. Security functions. Be prepared to enumerate the security functions supported in J2EE. You should know which of these functions can be controlled programmatically and which declaratively. Secure Socket Layer. You are expected to know the basics of SSL: its applicability (which security functions does it address) and features (SSL is a configurable framework, rather than a concrete suite of cryptographic algorithms). Controlling authentication policies. You should know the values of the peerauthenticationmode parameter, and how to use them to control authentication of clients and servers. Authentication mechanisms in J2EE. You are expected to know what authentication mechanisms are required by J2EE for web components and EJBs. Certificate-based authentication versus password-based authentication. Be prepared to compare authentication methods based on public key certificates with methods based on usernames and passwords. Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 11
14 VisiMessage This section tests your overall knowledge of Java Message Service and VisiConnect. JMS messaging models. You should be able to characterize the two messaging models supported by JMS: publish/subscribe and message queues. Message filtering. You should be able to describe filtering capabilities in JMS. Know which parts of a JMS message can be examined by JMS filters. Message body types. You should know the specified JMS message body types, and which JMS message body type is most appropriate for transporting particular kinds of data. Quality of Service. You should be able to characterize the Quality of Service support offered in JMS. 12 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
15 Sample Questions with Answers Questions 1. Which of the following statements are true: A) All methods of a remote interface must have different names B) A remote interface can have two methods with the same name, only if they have different return types C) A remote interface cannot inherit from two base interfaces containing a method with the same name 2. The JNDI lookup method invoked with a name of an EJB returns: A) A reference to the EJB s remote interface B) A reference to the bean instance C) A reference to the bean s home interface D) A reference to the EJB container 3. To test if two EJB references refer to the same object, a client should: A) Use the java.lang.object.equals(object obj) method. B) Compare primary keys using the == operator. C) Compare values returned by java.lang.object.hashcode() for both EJBs. D) Use the javax.ejb.ejbobject.isidentical(ejbobject obj) method. 4. Which of the following lists represents a correct sequence of actions performed by the container after a client requests creating a new entity bean with container-managed persistence: A) Creating an EJB Object, calling ejbcreate(), calling ejbpostcreate(), creating a record in the database. B) Calling ejbcreate(), creating a record in the database, creating an EJB Object, calling ejbpostcreate(). Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 13
16 5. Which of the following statements (if any) are true: A) In BAS, a stateless session bean instance once created is never removed. B) In BAS, the removal of stateless session bean instances is controlled by clients. C) In BAS, an unused stateless session bean instance is removed after a configurable timeout expires. 6. If a bean class method throws an exception which is defined in its throws clause, the container will: A) rollback (or mark for rollback) the transaction B) not rollback (nor mark for rollback) the transaction 7. By default, servlet instances are: A) Multi-threaded B) Single-threaded C) None of the above, as there is no default threading policy 8. Consider the statement: <%! int count = 0 %>. This statement will be converted to: A) A definition of a local variable B) A definition of the JSP/servlet class data member C) A name-value pair in the request object D) A name-value pair in the session context 9. Secure Sockets Layer (SSL) technology can: A) Encrypt data exchanged between two parties B) Authenticate clients using public key cryptography C) Authenticate clients using Username / Password scheme D) Be enhanced by adding new cipher suites 14 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
17 10. To transport a serialized Java object in the body of a JMS Message, which body type should be used:` A) MapMessage B) TextMessage C) ObjectMessage D) BytesMessage E) StreamMessage Answers 1. Correct answer: C. Due to the restrictions imposed by RMI-IIOP, a remote interface cannot inherit from two base interfaces containing methods with the same name, even if these methods had different return values. 2. Correct answer: C. The JNDI lookup method invoked with a name of an EJB returns a reference to the bean s home interface. The resulting reference has to be narrowed to the type of the home interface using the javax.rmi.portableremoteobject.narrow() method. 3. Correct answer: D. To test if two EJB references refer to the same object, a client should use the javax.ejb.ejbobject.isidentical(ejbobject obj) method. For instance, if two references were stored in variables obj1 and obj2, they could be compared using the statement: obj1.isidentical(obj2). On contrary, using the equals() method would compare stubs, not the remote objects. 4. Correct answer: B. After a client requests creating a new entity bean with container-managed persistence, the container performs the following actions: Calling ejbcreate() Creating a record in the database Creating an EJB Object Calling ejbpostcreate() 5. Correct answer: A. In BAS, stateless session bean instances are never removed. Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved. 15
18 6. Correct answer: B. If a bean class method throws an exception which is defined in its throws clause (i.e. an application exception), the container will not rollback the transaction. 7. Correct answer: A. By default, servlet instances are multi-threaded. 8. Correct answer: B. A correct JSP scriplet starting with <%!, for instance, <%! int count = 0 %>, is converted to a definition of a class data member. 9. Correct answers: A, B, D. The Secure Sockets Layer (SSL) technology can be used to encrypt data exchanged between two parties and authenticate clients using public key cryptography. It can be also enhanced by adding new cipher suites. SSL does not support authentication based on usernames and passwords. 10. Correct answer: C. To transport a serialized Java object in the body of a JMS Message, the ObjectMessage body type should be used. 16 Borland Application Server Certification Study Guide. Copyright 2001 Borland Software Corporation. All Rights Reserved.
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