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  • Book Overview & Buying EJB 3 Developer Guide
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EJB 3 Developer Guide

EJB 3 Developer Guide

By : Michael Sikora
4.2 (6)
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EJB 3 Developer Guide

EJB 3 Developer Guide

4.2 (6)
By: Michael Sikora
Buy this Book

Overview of this book

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

Local Interfaces

Up to this point all our examples have used the session bean remote interface, as the clients have run in their own JVM outside the EJB container. Behind the scenes, a remote interface uses the RMI-IIOP protocol for network operations. This protocol stipulates that method arguments are passed by value and not by reference. Passing by value means that an object being passed from the client to the remote bean, or vice versa, is first serialized then passed over the network then deserialized. This all has an impact in terms of performance. Even if our client is a session bean invoking another in the same container there is a performance overhead if we use a remote interface because of the serialization and deserialization taking place. For this reason EJB technology provides a local interface option for session beans. Method arguments are passed by reference and not by value so improving performance.

To illustrate all this we shall create a stateless session bean which will...

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