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  • Book Overview & Buying SPRING COOKBOOK
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SPRING COOKBOOK

SPRING COOKBOOK

By : Jerome Jaglale, Yilmaz
4 (3)
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SPRING COOKBOOK

SPRING COOKBOOK

4 (3)
By: Jerome Jaglale, Yilmaz

Overview of this book

This book is for you if you have some experience with Java and web development (not necessarily in Java) and want to become proficient quickly with Spring.
Table of Contents (14 chapters)
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13
Index

Using a bean directly

It's possible to get a bean directly from Spring instead of using dependency injection by making Spring's ApplicationContext, which contains all the beans, a dependency of your class. In this recipe, we'll inject an existing bean into a controller class.

Getting ready

We will use the code from the Defining a bean implicitly with @Component recipe, where we defined a UserService bean.

How to do it…

Here are the steps to get and use a bean directly:

  1. In the controller class, add an ApplicationContext field annotated with @Autowired:
    @Autowired
    private ApplicationContext applicationContext;
  2. In a controller method, use the ApplicationContext object and its getBean() method to retrieve the UserService bean:
    UserService userService = (UserService)applicationContext.getBean("userService");        

How it works…

When the controller class is instantiated, Spring automatically initializes the @Autowired field with its ApplicationContext object. The...

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