Job Ready Java

Lesson 38Pulling It All Together: Building the Class Roster with Spring

In this lesson, we pull together the code to convert our Class Roster application into a Spring application. In the new version, we will have Spring do the dependency injection and application wiring that we currently do by hand in the App class and the service layer unit test. Using the Spring DI container is a foundational Spring skill. Almost all other Spring features (security, AOP, MVC, REST) take advantage of the core Spring DI container, which means that this is something you'll do in just about every Spring project you encounter.

PROGRAM OBJECTIVES

We'll convert our Class Roster application by doing these tasks:

• Add the Spring libraries to the POM file
• Add the shell Spring configuration files to the project
• Convert the DI and application wiring code currently in the App class into Spring
• Convert the unit tests to use Spring

INCLUDE THE SPRING LIBRARIES

To take advantage of the Spring framework, we must ensure that the Spring framework library is included in the Maven POM. As we discussed in the Maven lesson, you must include a dependency entry for each library we want to include in our project.

Open your pom.xml file and verify that it includes the code dependencies, as shown in Listing 38.1.

LISTING 38.1

The pom.xml File

    <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 ...