Chapter 1 Introducing EJB 1. What is Java EE Introduction to EJB...5 Need of EJB...6 Types of Enterprise Beans...7

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1 CONTENTS Chapter 1 Introducing EJB 1 What is Java EE Java EE 5 Components... 2 Java EE 5 Clients... 4 Java EE 5 Containers...4 Introduction to EJB...5 Need of EJB...6 Types of Enterprise Beans...7 Session Beans... 7 Entity Beans... 8 Message-Driven Bean... 8 Previous Versions of EJB...8 EJB Need of EJB New Features of EJB Annotations Callback Methods Dependency Injection POJO Model Elimination of Home Interface and Home Objects Elimination of Component Interface Interceptors Java Persistence API Summary...15 Chapter 2 Session Bean 17 Introduction...18 Concept of Session Bean Stateless Session Bean...19 Life cycle of a Stateless Session Bean Elements of Stateless Session Bean Developing a Stateless Session Bean Deployment...28 Stateful Session Bean...35 Life Cycle of Stateful Session Bean Developing a Stateful Session Bean Choosing Between Stateless or Stateful Session Bean Summary...44 v

2 EJB 3.0 in Simple Steps Chapter 3 Message Driven Bean 45 Messaging Concept...46 JMS...47 What is MDB?...50 Why to use MDB? Structure of an MDB Life cycle of Message Driven Bean Writing an MDB...54 Sample Application Deploying the EJB Running the Application Summary...77 Chapter 4 Transactions 79 Introduction...80 Transaction-Where they are found?...80 ATM Online Book Store Medical System Why do we Need Transactions?...81 Transaction Properties...82 Atomicity Consistency Isolation Durability Transaction Models...84 Flat Transactions...84 Nested Transactions Chained Transactions Saga Transactions Distributed Transactions...87 The Two-Phase Commit Protocol Transaction Support in EJB Java Transaction API (JTA) Container-Managed Transactions Bean-Managed Transactions Summary Chapter 5 Persistence: Entity Programming Model 97 Introduction...98 Object-Relational Mapping (ORM)...98 Introduction to Entity...99 vi

3 Contents Specifying 106 Specifying 106 Specifying Specifying 108 Specifying 109 Entity and Session beans When To Use Entity Bean Entity class Entity manager API Life Cycle of Entity Entity Listeners and callbacks Entity Listeners Callbacks Packaging a persistence unit name transaction-type Provider jta-data-source, non jta-data-source Mapping-file Obtaining an Entity Manager Session Bean using the Container Injection Obtaining EntityManager using EntityManagerFactory Obtaining EntityManager by looking up using JNDI Creating a Sample Application Compiling the Java classes Deploying the Sample Application Executing the Sample Application Summary Chapter 6 Java Persistent Query Language 141 Introduction to JPQL JPQL statements The SELECT statement The UPDATE statement The DELETE statement PQL Functions String functions Arithmetic functions Temporal functions SELECT clause From clause WHERE clause vii

4 EJB 3.0 in Simple Steps GROUP BY, HAVING clauses ODRER BY clause CONDITIONAL EXPRESSION Path expressions Using the BETWEEN operator Using the IN operator Using the LIKE operator Using the NULL operator Using the EMPTY comparison expression JPQL collection member expression JPQL EXISTS expressions JPQL ALL, ANY and SOME expressions JOINS Inner Join Left Outer Join Fetch Join Query API Defining Dynamic queries Defining Named queries Executing Queries Creating a Query instance Creating Named Query instances Creating dynamic query instances Query interface Parameter setting in query Retrieving a single entity in a query Retrieving a Collection of entities Paginating a result list Controlling the flush mode Specifying Query hints Summary Chapter 7 Entity Relationships 163 One-to-One One-to-Many Many-to-One Many-to-Many Mapping Collection-Based Relationships Entity Inheritance Single table per class hierarchy Separate table per subclass Single table per concrete entity class Summary viii

5 Contents Chapter 8 EJB 3.0 Timer Services 201 EJB 3.0 Timer Service Different Types of Timers Timer Service API The TimerService Interface The Timer Interface The TimedObject Interface The TimerHandle Interface Using Timer Services Creating Timer Objects Cancellation Expiration Strengths and Limitations of EJB Timer Services Creating a Sample Application using Timer Service Deploying the EJB Running the Application Summary Chapter 9 Interceptors 219 What are Interceptors? Interceptor Lifecycle Specifying Interceptors Interceptor class Applying Interceptors through XML Disabling Interceptors Using Annotations Programming by using the Business Methods Programming by using the Life Cycle Call Back Methods Specifying Default Interceptor Methods Life cycle Call Back Methods in an Interceptor Life Cycle Callback Interceptor Methods in a MDB Life Cycle Callback Interceptor Methods in a Session Bean Exception Handling Aborting a method invocation Catch and throw exceptions Summary ix

6 EJB 3.0 in Simple Steps Chapter 10 Security in EJB 237 Introduction Security Violations Authentication and Authorization Authentication Authentication Schemes Authorization Users, groups, realms, and roles EJB Security Transport Security with SSL Role-Based Security Declarative Security Programmatic Security Protection Domain security JAAS Security JAAS Implementation Summary x