Developing Java EJB Applications

Course:  JAVAEJB
Duration:  5 Days
Level:  II
Course Summary

This course gives the experienced Java developer a thorough grounding in Enterprise JavaBeans -- the Java EE standard for scalable, secure, and transactional business components. EJB 3.0 has reinvigorated this area of Java enterprise development, with dramatic improvements in ease of use and smooth integration with servlet-based or JSF web applications. This course treats the 3.0 specification, with a few notes on 2.1 compatibility but an emphasis on doing things the 3.0 way.

Students get an overview of the EJB rationale and architecture, and then dive right into creating session beans and entities. The new dependency-injection features of EJB3 cause perhaps the most confusion, so we work through a chapter devoted explicitly to DI and JNDI, and basically how components find each other to make an application. We study entities and the Java Persistence API in depth, and get a look at message-driven beans as well. The latter phase of the course covers advanced topics including transactions, security, and interceptors.

This version of the course is designed to be appropriate for any EJB-capable Java Application Server, including Websphere, Oracle/Weblogic, JBOSS, and others.

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Topics Covered In This Course

Overview

  • Enterprise Applications
  • Containers and Objects
  • Three Containers
  • Remote Connectivity
  • Scalability and Availability
  • Security
  • Transaction Control

Architecture

  • What is an EJB?
  • Types of Beans
  • Inversion of Control
  • The Bean-Type Annotations
  • Dependency Injection
  • The @EJB Annotation
  • Deploying EJB Applications
  • Configuring Data Sources
  • Development Cycle and Roles

Session Beans

  • Interface/Implementation Split
  • Stateful vs. Stateless
  • The @Stateless Annotation
  • Lifecycle and State Transitions
  • Session Context
  • The @Stateful Annotation
  • State Transitions
  • Singletons and Pools

Entities

  • The Java Persistence API
  • Persistence Annotations
  • Configuration by Exception
  • ORM Annotations
  • The EntityManager
  • Acquiring and Using the EntityManager
  • persistence.xml
  • @Enumerated and @Temporal Types

Associations

  • Associations, Cardinality, and Ownership
  • Annotations
  • Unidirectional vs. Bidirectional
  • The @Embedded Annotation

Java Persistence Query Language

  • OO Query Languages
  • The FROM Clause and Directionality
  • The WHERE Clause
  • The SELECT Clause
  • Joins
  • Aggregates and Grouping
  • Ordering

Dependency Injection

  • Interdependent Systems
  • The Factory Pattern
  • The Service Locator Pattern
  • Dependency Injection
  • Injection by Magic?
  • Injection by Type
  • Injection by Name
  • The Component Environment
  • Deployment Descriptors
  • Impact on Stateful Session Beans
  • JNDI
  • Connecting to a Remote Bean
  • Using mappedName
  • Who Can Declare Dependencies

Message-Driven Beans

  • Asynchronous Messaging
  • The Java Message Service
  • Message-Driven Beans
  • Message Types
  • Injecting JMS Queues
  • JMS Configuration

Transactions

  • ACID Transactions
  • The EntityTransaction Interface
  • EJB Transaction Attributes
  • Persistence Contexts
  • Extended Persistence Contexts
  • Isolation Levels
  • Application-Managed Persistence
  • The SessionSynchronization Interface
  • Impact on JMS and MDBs

Exception Handling

  • Java Exceptions
  • Remote Exceptions
  • EJB Exception Handling
  • System Exceptions
  • Application Exceptions
  • Transaction Control

Security

  • Authentication and Authorization
  • Declarative Authorization
  • Abstract Roles
  • Concrete Realms
  • Configuring User Realms
  • Programmatic Authorization
  • Run-As Identity

Interceptors

  • EJB and AOP
  • The Intercepting Filter Pattern
  • EJB Interceptors
  • Annotating Interceptor Classes
  • The InvocationContext Interface
  • Binding Interceptors to Targets
  • Shared Lifecycle and Context
  • Interceptors and MDBs

Timers

  • The EJB Timer Service
  • The TimerService Interface
  • The Timer Interface
  • Timeout Methods
  • Timer Handles
  • Transactions and Timers
What You Can Expect

On completing this course, students will be able to:

  • Understand the role of EJB in the broader Java EE platform.
  • Describe the features that are implemented by an EJB container on behalf of application components.
  • Build stateless session beans as part of a service layer or SOA.
  • Build JPA entities to represent persistent data records within the Java application.
  • Develop systems of entities to manage complex data models including 1:1, 1:N, and N:N associations.
  • Manage transactional behavior of the application through declarative and programmatic techniques.
  • Invoke EJB sessions from Java web applications.
  • Use dependency injection and JNDI names to assemble complex web/EJB systems with minimal fuss and maximal flexibility.
  • Implement message-driven beans to process queued messages asynchronously.
  • Declare and/or program transaction boundaries, persistence contexts, and exception handling to properly control persistence logic.
  • Apply role-based authorization policies to EJBs.
  • Build interceptors to perform generic processing before, after, or around EJB business-method invocations.
  • Use EJB timers to defer processing or establish regularly scheduled tasks.
Recommended Prerequisites
  • Solid Java programming skills and understanding of OO Java and Java-5 language features is essential. Course 103 is excellent preparation for this course.
  • Experience with developing Java web applications is very helpful for this course, but not strictly required.
  • Some knowledge of XML will be useful for writing the occasional deployment descriptor, but is not required. Course 501 is recommended for those who would like to get more familiar with XML before pursuing this course.
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