Book Image

Enterprise Application Development with Ext JS and Spring

By : Gerald Gierer
Book Image

Enterprise Application Development with Ext JS and Spring

By: Gerald Gierer

Overview of this book

Spring and Ext JS are cutting edge frameworks that allow us to build high performance web applications for modern devices, that are now consuming data at a faster rate than ever before. It is the appropriate time for you to understand how to best leverage these technologies when architecting, designing, and developing large scale web development projects. This practical guide condenses an approach to web development that was gained from real world projects, and outlines a simple, practical approach to developing high performance, and enterprise grade web applications. Starting with configuring Java, NetBeans, and MySQL to prepare your development environment, you will then learn how to connect your NetBeans IDE to the MySQL database server. We will then explore the Task Time Tracker (3T) project database structure and populate these tables with test data. Following on from this, we will examine core JPA concepts after reverse engineering the domain layer with NetBeans. Leveraging the Data Access Object design pattern, you will learn how to build the Java DAO implementation layer assisted by generics in base classes, followed by a Data Transfer Object enabled service layer to encapsulate the business logic of your 3T application. The final chapters that focus on Java explore how to implement the request handling layer using Spring annotated controllers, and deploy the 3T application to the GlassFish server. We will then configure the Ext JS 4 development environment and introduce key Ext JS 4 concepts, including MVC and practical design conventions. Covering a variety of important Ext JS 4 strategies and concepts, you will be fully-equipped to implement a variety of different user interfaces using the Ext JS MVC design pattern. Your journey ends by exploring the production build and deployment process using Maven, Sencha Cmd and GlassFish.
Table of Contents (22 chapters)
Enterprise Application Development with Ext JS and Spring
About the Author
About the Reviewers
Introducing Spring Data JPA

Chapter 3. Reverse Engineering the Domain Layer with JPA

The domain layer represents the real-world entities that model the heart of your application. At the highest level, the domain layer represents the application's business domain and fully describes the entities, their attributes, and their relationships with one another. At its most basic level, the domain layer is a set of Plain Old Java Objects (POJOs) that define the Java representation of the database tables being mapped onto your application. This mapping is achieved through JPA.

The Java Persistence API (JPA) is one of the most significant advances in the Java EE 5 platform, replacing the complex and cumbersome entity beans with the far simpler POJO-based programming model. JPA provides a standard set of rules for Object Relational Mapping (ORM), which are simple, intuitive, and easy to learn. Database relationships, attributes, and constraints are mapped onto POJOs using JPA annotations.

In this chapter we will do the following...