EJB Development using Rational Application Developer

Overview

This course utilizes a combination of instructor-led discussions and interactive workshops to demonstrate the capabilities of IBM�s Rational Application Developer IDE for the development of enterprise applications using Enterprise JavaBeans in an N-tier architecture. The implementation of these components and their access via servlet clients will be discussed. Each student will learn the following: creation of session, Message and entity EJBs, use the Universal Test Client, create container-managed and bean-managed entity beans, connect EJBs using transactions, understand the role of EJB containers, utilize activation and passivation, JNDI usage and the deployment of enterprise JAR and EAR components using IBM�s WebSphere Application Server.

Prerequisites

Each student should have a thorough understanding of the Java language and use of the Rational Application Developer IDE. Additionally, experience with JavaBeans, relational databases and server-side development concepts is preferred.

Class Format

Lecture and Lab

Audience

Developers and other advanced Java professionals that will be designing, developing and creating enterprise-wide applications using Enterprise JavaBeans with the Rational Application Developer.

Learning Objectives

After completing this course, the student should be able to:

Understand the EJB capabilities of the RAD for projects and perspectives

Define and utilize the interface between servlets and Enterprise JavaBeans

Understand the role the session, entity and Message EJBs for J2EE enterprise applications

Depict the relational mapping tool within RAD for building Entity beans

llustrate the role of JMS and message-driven beans

Create Bean-managed persistent EJBs (BMP)

Use RAD to create a Container-managed persistent EJB (CMP)

Creation of entity EJBs and defining container-managed relationships

Demonstrate the use of Universal Test Client for testing EJBs

Discuss the implementation of EJBs using EJS servers and the role of the EJB containers

Illustrate the deployment of enterprise applications to WebSphere Application Server within RAD environment

Demonstrate the usage of transactions with EJBs using Java Transaction API

Understand EJB deployment for JAR and EAR files

Course Duration

4 Days

Course outline

Enterprise Development

Enterprise application role
Component architecture
JavaBeans vs EJBs
N-tier architecture
Enterprise development motivation
EJB vs CORBA comparison
Distributed Proxy model
Remote Method Invocation
J2EE overview

Session Beans

Stateless vs Stateful
Bean pooling
Serialization
Session bean methods
Session bean lifecycle
JNDI lookup
Session Context
javax.ejb.SessionBean
Deployment Descriptors

EJB Overview

EJB benefits
EJB portability foundation
EJB container services and responsibilities
Enterprise Bean types
Session vs Entity vs Message beans
Stateful vs Stateless Session
CMP vs BMP Entity beans
EJB Container role
Development within RAD

Stateless Session Beans

Characteristics
Bean pooling
Bean lifecycle
Stateless vs Stateful
Home, Remote and Bean classes
EJB generated code
EJB Container deployment
Universal Test Client testing
EJB deployment code
Test client dialog

Entity Beans

Role of Entity beans
Entity bean lifecycle
Object relational mapping
Activation/Passivation
EJB call-back methods
Container-managed persistence
Bean-managed persistence
Deployment Descriptors

Stateful Session Beans

Bean pooling
WebSphere pooling strategy
Passivation & Activation
Stateful bean lifecycle
ejb-jar.xml file
WebSphere application server deployment

Entity Bean Development

javax.ejb.EnterpriseBean
EntityBean interfaces
Finder methods
Container-managed methods
Depict the usage of setEntityContext, ejbLoad, ejbFind, ejbCreate, ejbStore, ejbRemove, etc
CMP Deployment Descriptors
Map.mapxmi metadata
Bean-managed persistence

Message Beans

JMS & JMS providers
Asynchronous messaging: Point-to-Point and Publish/Subscribe
JMS Destinations
Connection Factories
JMS Listeners
WebSphere JMS providers
MQSeries clustering
Message bean lifecycle
onMessage method
Deployment Descriptor file

EJB Architecture

Underlying EJB architecture
Marshalling & Unmarshalling
Role of RMI and CORBA
Parameter passing
Distributed garbage collection
Remote object activation
Stubs vs Skeletons
Object serialization
Transient vs non-Transient
Home object and interfaces
Remote object

EJB Security

WebSphere Security model
Authentication/Authorization
Delegation and Trusting
Network Deployment implementation
LDAP vs Local OS registries
Security Collaborators
Security role mapping
RunAsmode
RunAsIdentity
HTTP single sign-on

EJB Transactions

Transaction model
Flat vs Nested
Programmatic vs Declarative demarcation
EJB Transaction attributes
Java Transaction API
UserTransaction
Transactional methods
Isolation levels
Transaction problems: Dirty Read, Unrepeatable Read and Phantoms

EJB Best Practices

Participant roles
Best practice strategies
EJB placement
Development practices: coding, modeling and documentation
EJB modeling
EJB and Legacy integration
Enforcing reusability
Deployment strategies

Persistent Best Practices

When to utilize Entity beans
CMP vs BMP
Stored Procedures
Object Relational Mapping
Use with legacy database design
Strategies for resolving legacy problems