xxxiii
Introduction
In today’s business world, applications need to access data, apply business logic, add presentation layers, be mobile,
use geolocalization, and communicate with external systems and online services. at’s what companies are trying
to achieve while minimizing costs, using standard and robust technologies that can handle heavy loads. If that’s your
case, you have the right book in your hands.
Java Enterprise Edition appeared at the end of the 1990s and brought to the Java language a robust software
platform for enterprise development. Challenged at each new version, badly understood or misused, overengineered,
and competing with open source frameworks, J2EE was seen as a heavyweight technology. Java EE beneted from
these criticisms to improve and today focuses on simplicity.
If you are part of the group of people who still think that “EJBs are bad, EJBs are evil,” read this book, and you’ll
change your mind. EJBs (Enterprise Java Beans) are great, as is the entire Java EE 7 technology stack. If, on the
contrary, you are a Java EE adopter, you will see in this book how the platform has found equilibrium through its ease
of development and easy component model. If you are a beginner in Java EE, this is also the right book: it covers the
most important specications in a very understandable manner and is illustrated with a lot of code and diagrams to
make it easier to follow.
Open standards are collectively one of the main strengths of Java EE. More than ever, an application written with
JPA, CDI, Bean Validation, EJBs, JSF, JMS, SOAP web services, or RESTful web services is portable across application
servers. Open source is another of Java EE’s strengths. As you’ll see in this book, most of the Java EE 7 Reference
Implementations use open source licensing (GlassFish, EclipseLink, Weld, Hibernate Validator, Mojarra, OpenMQ,
Metro, and Jersey).
is book explores the innovations of this new version, and examines the various specications and how to
assemble them to develop applications. Java EE 7 consists of nearly 30 specications and is an important milestone
for the enterprise layer (CDI 1.1, Bean Validation 1.1, EJB 3.2, JPA 2.1), for the web tier (Servlet 3.1, JSF 2.2, Expression
Language 3.0), and for interoperability (JAX-WS 2.3 and JAX-RS 2.0). is book covers a broad part of the Java EE 7
specications and uses the JDK 1.7 and some well-known design patterns, as well as the GlassFish application server,
the Derby database, JUnit, and Maven. It is illustrated abundantly with UML diagrams, Java code, and screenshots.
How the Book Is Structured
is book concentrates on the most important Java EE 7 specications and highlights the new features of this release.
e structure of the book follows the architectural layering of an application.
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nelsonct2015-08-31能有帮助 ，谢谢
joeyweijiang2014-05-29页面 很清楚， PDF格式。 正好想再学一下JEE7。
