Course Description:

Fast Track to Enterprise JavaBeans 3.0 (EJB 3)

The Enterprise JavaBeans 3.0 specification is a deep overhaul of the EJB specification that is intended to improve the EJB architecture by reducing its complexity from the developer's point of view. It leverages annotations (introduced in Java 5) and Object-Relational Mapping (ORM) technologies to eliminate the dependence on complex EJB APIs, allow POJO (Plain Old Java Object) based development, and provide an effective technology for creating distributed, transactional components, and for mapping relational data to an object schema.

This course provides thorough coverage of the EJB3 technology - presented in a clear and effective manner. It starts with the basic concepts and APIs of EJB and then continues on with complex topics such as message driven beans and transactions. New concepts such as the use of annotations and the use of Dependency Injection to initialize references are covered in depth. The course also includes a solid introduction to developing persistent entities using the Java Persistence API (JPA).

The coures uses hands-on labs and a well-paced approach to make this complex technology understandable in an accelerated fashion. You will come away with a comprehensive understanding of EJB and the important issues that need to be considered to use it in real world applications. This course can be customized to your requirements.

Course Information

Duration: 3 days

Hands-on: 50% hands-on, 50% lecture

Supported Platforms:

Skills Gained:

Understand the EJB 3 architecture and API, and how it fits into the overall Java EE architecture
Understand and use the EJB 3 annotations
Create, deploy & use stateful & stateless session beans
Use EJB 3 dependency injection to initialize resources
Understand and use Interceptors (Lifecycle and Business Method)
Use JNDI (Java Naming and Directory Interface)
Write EJB clients (remote and local)
Understand, deploy and use message-driven beans
Understand distributed transactions, the Java Transaction API, and the EJB transaction model
Understand and use the EJB security model
Understand the new Java Persistence API (JPA)
Create deploy and use JPA persistent Entities
Map relational schemas to persistent entities, including the use of primary keys
Understand and use the EntityManager
Understand and use Java Persistence Query Language
Be familiar with more advanced JPA concepts such as entity relationships (1-1, 1-N, N-N, unidirectional, bidirectional), and inheritance
Understand practical architectural issues associated with EJB applications

Course Details:

Session 1: Introduction

Overview of EJB and Java Persistence API (JPA)
- Goals of EJB, EJB in the Java EE architecture
EJB 3.0 Overview
- Session Beans, Persistent Entities, Message Driven Beans
Lab: Server setup and introduction

Session 2: Session Beans

Session Bean Overview
- Services provided, Stateless and Stateful Beans
- Defining a Session Bean - EJB 3 Annotations
- The Bean Implementation, Remote and Local Business Interface
Packaging and Deployment
- ejb-jar file, Deployment Descriptors in EJB 3
- EAR file
- The EJB Container
Lab: Creating a Stateless Session Bean
JNDI Overview
- Distributed Naming and Lookup
- Context and InitialContext
- Using JNDI
Writing an EJB 3 Client
- Client View of a Session Bean
- PortableRemoteObject and Casting
- Running the Client
Lab: Creating an EJB Client

Session 3: Additional Capabilities

Resources and Dependency Injection
- EJB referencing another EJB
- Referencing Resources, Environment Entries
- Connection Factories (DataSource and others)
Lab: Using Dependency Injection
Lab: Creating and Using Environment Entries
Session Bean Lifecycle and Interceptors
- Stateless Session Bean Lifecycle
- Business Method Interceptors, InvocationContext, Lifecycle Callback Interceptors, Interceptor Classes
Lab: Working with Interceptors
Stateful Session Beans
- Overview
- Defining, Client Relationship
- Lifecycle, Activation, Passivation
Lab: Stateful Session Beans
Timer Service
- Overview and usage

Session 4: Message-Driven Beans

Overview of Messaging Systems
- Messaging, Loose Coupling
- Pub/Sub, Point2Point
Overview of JMS API
- Overview and Structure
- ConnectionFactory and Destination
- JMS Producer and Consumer Client example
- JMS Messages
Message-Driven Beans (MDB)
- Overview and Goals
- @MessageDriven and MDB example
- Configuring with activationConfig
- State Diagram and Interceptors
Lab: Message Driven Beans

Session 5: Transactions and Security

Overview of Transactions and Transactional Systems
- ACID, Transaction Managers, Resource Managers
Transactions in EJB 3
- Declarative Transaction Management
- Transaction Attributes and Transactional Scope
- Transaction Scenarios and Bean-Managed Tx
Lab: Working with Transactions
Security
- Java EE Security Overview (Role-based)
- @RolesAllowed, @PermitAll
- Programmatic Security
Lab: Integrating EJB and Java EE Security

Session 6: Exceptions

Exception Overview
- Checked and Unchecked Exceptions
Exceptions in EJB 3
- Application Exceptions, System Exceptions
EJB 3 Best Practices
- When to Use, Coarse-Grained Business Interfaces, Session Façade, Transaction Guidelines, Clustering

Session 7: Introduction to Java Persistence API (JPA)

Overview
- Persistence Layers, Object-Relational Mapping (ORM), JDBC
- JPA Overview
Mapping with JPA
- Entities and @Entity, ids and @Id,
- Generated Id Values
- Basic Mapping Types
Lab: Mapping an Entity Class
EntityManager
- Persisting to the DB, the EntityManager,
- Persistence Units and Configuration
- Injecting an EntityManager
- Retrieving Persistent Entities
Lab: Using the EnityManager to persist and find an Entity

Session 8: Updates and Queries

Inserting and Updating
- Transient, Persistent, Detached, Removed
- Persisting new Entities, Updating a Persistent Instance
Lab: Inserting and Updating an Entity
Querying and JPQL
- Object Based Queries, Select statements, WHERE clause
- Named Queries
Lab: Creating and Using JPQL Queries
Versioning and Optimistic Locking
- Detached Instances
- Versioning and Optimistic Locking in EJB

Session 9: Overview of Entity Relationships

Object Relationships Overview
Mapping Overview (1-1, 1-N, N-1, N-N)
Unidirectional and Bidirectional
Owner, Invoice and Join Columns
Lazy and Eager Loading, and Cascading
Inheritance Mapping Overview

Session 10: Additional JPA Capabilities

Versioning Overview
Queries - Projection, Aggregate, Bulk Update/Delete
Embedded Objects
EJB 3 and Java SE