Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying EJB 3 Developer Guide
  • Table Of Contents Toc
EJB 3 Developer Guide

EJB 3 Developer Guide

By : Michael Sikora
4.2 (6)
Buy this Book
close
close
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)
close
close
close
EJB 3 Developer Guide
Icon
EJB 3 Developer Guide
Credits
Icon
Credits
About the Author
Icon
About the Author
About the Reviewers
Icon
About the Reviewers
Preface
Icon
Preface
Lock Free Chapter
1
Introduction to the EJB 3 Architecture
Icon
Introduction to the EJB 3 Architecture
Icon
Introduction to the Java EE Architecture
Icon
The EJB 3 Architecture
Icon
Getting Started
Icon
Summary
2
Session Beans
Icon
Session Beans
Icon
Introduction
Icon
Stateless Session Beans
Icon
Stateful Session Beans
Icon
Local Interfaces
Icon
Summary
3
Entities
Icon
Entities
Icon
Introduction
Icon
EJB 3 Entities
Icon
Introducing the EntityManager
Icon
Packaging and Deploying Entities
Icon
Field-Based Annotations
Icon
Generating Primary Keys
Icon
Overriding Metadata Defaults
Icon
Summary
4
Object/Relational Mapping
Icon
Object/Relational Mapping
Icon
O/R Mapping Default Behavior
Icon
O/R Mapping Overriding Defaults
Icon
O/R Mapping Additional Annotations
Icon
O/R Inheritance Mapping
Icon
Summary
5
The Java Persistence Query Language
Icon
The Java Persistence Query Language
Icon
Introduction
Icon
Simple Queries
Icon
Projection
Icon
Conditional Expressions
Icon
Aggregate Functions
Icon
Queries with Relationships
Icon
Joins
Icon
Collection Comparison Expressions
Icon
Constructor Expressions
Icon
SubQueries
Icon
Functions
Icon
Queries with Parameters
Icon
Named Queries
Icon
Handling Date and Time
Icon
Bulk Update and Delete
Icon
Native SQL
Icon
Summary
6
Entity Manager
chevron up
Icon
Entity Manager
Icon
Application-managed Entity Manager
Icon
Entity Manager Merge
Icon
Entity Manager Methods
Icon
Cascade Operations
Icon
Extended Persistence Context
Icon
Entity LifeCycle Callback Methods
Icon
Summary
7
Transactions
Icon
Transactions
Icon
Introduction
Icon
Container-Managed Transaction Demarcation
Icon
Examples of Transaction Attributes
Icon
Controlling Container Managed Transactions
Icon
Concurrency and Database Locking
Icon
UserTransaction Interface
Icon
Summary
8
Messaging
Icon
Messaging
Icon
Introduction
Icon
Java Message Service (JMS) API
Icon
Queue Producer and Consumer Examples
Icon
Topic Producer and Consumer Examples
Icon
Motivation for Message-Driven Beans
Icon
A Simple Message-Driven Bean Example
Icon
MDB Activation Configuration Properties
Icon
MessageDrivenContext
Icon
MDB LifeCycle
Icon
MDB Example Revisited
Icon
Sending Message Confirmation to a Client
Icon
MDBs and Transactions
Icon
Summary
9
EJB Timer Service
Icon
EJB Timer Service
Icon
Introduction
Icon
Timer Service Examples
Icon
A Timer Interface Example
Icon
Timers and Transactions
Icon
Summary
10
Interceptors
Icon
Interceptors
Icon
Interceptor Methods
Icon
Interceptor Classes
Icon
Default Interceptors
Icon
Interceptor Communication
Icon
Summary
11
Implementing EJB 3 Web Services
Icon
Implementing EJB 3 Web Services
Icon
Overview of Web Service Concepts
Icon
Creating a Java Application Web Service
Icon
Overriding JAX-WS Annotation Defaults
Icon
Deploying an EJB Session Bean as a Web Service
Icon
Summary
12
EJB 3 Security
Icon
EJB 3 Security
Icon
Java EE Container Security
Icon
Authentication
Icon
EJB Authorization
Icon
Java EE Web Container Security
Icon
Summary
1
Annotations and Their Corresponding Packages
Icon
Annotations and Their Corresponding Packages

Entity Manager Merge

In this and the remaining sections we discuss topics which are applicable to both container-managed and application-managed entity managers. However, our examples will assume a container-managed entity manager is being used.

As we have seen, an entity becomes managed when we use the EntityManager.persist() method. At this point the entity is associated with a persistence context. While an entity is managed the state of the entity is automatically synchronized with the database by the entity manager. By default a persistence context is scoped to a transaction. When the transaction ends, the persistence context ends and the entity is no longer managed. An unmanaged entity is referred to as a detached entity and is no longer associated with a persistence context. This means that further changes to the entity are no longer reflected in the database. If an entity is passed by value, through the remote interface to another application tier for example, then it also becomes...

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
EJB 3 Developer Guide
End of Section 6
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon