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EJB 3 Developer Guide

By : Michael Sikora
Book Image

EJB 3 Developer Guide

By: Michael Sikora

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EJB 3 Developer Guide
Michael Sikora
May, 2008 | 276 pages
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Table of Contents (18 chapters)
EJB 3 Developer Guide
EJB 3 Developer Guide
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
Preface
Preface
Free Chapter
1
Introduction to the EJB 3 Architecture
Introduction to the EJB 3 Architecture
Introduction to the Java EE Architecture
The EJB 3 Architecture
Getting Started
Summary
2
Session Beans
Session Beans
Introduction
Stateless Session Beans
Stateful Session Beans
Local Interfaces
Summary
3
Entities
Entities
Introduction
EJB 3 Entities
Introducing the EntityManager
Packaging and Deploying Entities
Field-Based Annotations
Generating Primary Keys
Overriding Metadata Defaults
Summary
4
Object/Relational Mapping
Object/Relational Mapping
O/R Mapping Default Behavior
O/R Mapping Overriding Defaults
O/R Mapping Additional Annotations
O/R Inheritance Mapping
Summary
5
The Java Persistence Query Language
The Java Persistence Query Language
Introduction
Simple Queries
Projection
Conditional Expressions
Aggregate Functions
Queries with Relationships
Joins
Collection Comparison Expressions
Constructor Expressions
SubQueries
Functions
Queries with Parameters
Named Queries
Handling Date and Time
Bulk Update and Delete
Native SQL
Summary
6
Entity Manager
Entity Manager
Application-managed Entity Manager
Entity Manager Merge
Entity Manager Methods
Cascade Operations
Extended Persistence Context
Entity LifeCycle Callback Methods
Summary
7
Transactions
Transactions
Introduction
Container-Managed Transaction Demarcation
Examples of Transaction Attributes
Controlling Container Managed Transactions
Concurrency and Database Locking
UserTransaction Interface
Summary
8
Messaging
Messaging
Introduction
Java Message Service (JMS) API
Queue Producer and Consumer Examples
Topic Producer and Consumer Examples
Motivation for Message-Driven Beans
A Simple Message-Driven Bean Example
MDB Activation Configuration Properties
MessageDrivenContext
MDB LifeCycle
MDB Example Revisited
Sending Message Confirmation to a Client
MDBs and Transactions
Summary
9
EJB Timer Service
EJB Timer Service
Introduction
Timer Service Examples
A Timer Interface Example
Timers and Transactions
Summary
10
Interceptors
Interceptors
Interceptor Methods
Interceptor Classes
Default Interceptors
Interceptor Communication
Summary
11
Implementing EJB 3 Web Services
Implementing EJB 3 Web Services
Overview of Web Service Concepts
Creating a Java Application Web Service
Overriding JAX-WS Annotation Defaults
Deploying an EJB Session Bean as a Web Service
Summary
12
EJB 3 Security
EJB 3 Security
Java EE Container Security
Authentication
EJB Authorization
Java EE Web Container Security
Summary
Annotations and Their Corresponding Packages
Annotations and Their Corresponding Packages

Chapter 7. Transactions

In this chapter we will cover the following topics:

  • ACID properties of a transaction

  • Container-managed transactions

  • Container-managed transaction demarcation

  • Session synchronization interface

  • Doomed transactions

  • Transaction isolation levels

  • Lost update problem

  • Optimistic and pessimistic locking

  • How EJB 3 implements optimistic locking

  • Bean-managed transactions and the user transaction interface

Introduction

Up to now our examples have, for the most part, used transactions by default. Most of our examples have used container-managed transactions. As the name suggests, the transaction lifecycle is controlled by the EJB container. Container-managed transactions use the Java Transaction API, or JTA. Container-managed transactions have a default start and end point, however it is possible to configure these as we shall see later in this chapter. Java SE applications, which run outside an EJB container and so do not have JTA available, must use resource-local transactions. Resource...

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