spring cdi annotations

Innocent Iguana answered on March 1, 2023 Popularity 3/10 Helpfulness 7/10

answer spring cdi annotations

related Would you recommed to use CDI or Spring Annotations?

spring cdi annotations

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// pom.xml (make sure to install the dependency of Jakarta Context and Dependency Injection)
<dependency>
    <groupId>javax.inject</groupId>
    <artifactId>javax.inject</artifactId>
    <version>1</version>
</dependency>

// Game.java (Independent class)
@Named // This is nothing but an alternative of spring @Component annotation
public class Game {
    private String name;
    public Game() {this.name = "Pacman";}
    public String getName() { return name;}
}

// GameRunner.java (Dependent class that requires dependency of Game type bean)
@Named
public class GameRunner {
    private Game game;
    @Inject // This is nothing but an alternative of spring @Autowired annotation
    public GameRunner(Game game) {
        this.game = game;
    }
    public void runGame() {
        System.out.println("Running " + game.getName() + " game...");
    }
}

// GameConfiguration.java (Setting up custom beans)
@Configuration
public class GameConfiguration {
    @Bean
    public Game game() { 
        return new Game();
    }
    @Bean
    public GameRunner gameRunner(Game game) {
        return new GameRunner(game);
    }
}

// MainApplication.java (Launcher application)
public class MainApplication {
    public static void main(String[] args) {
        // Load the Spring application context using the configuration class
        ApplicationContext context = new AnnotationConfigApplicationContext(GameConfiguration.class);
        GameRunner gameRunner = context.getBean(GameRunner.class); // Retrieve the GameRunner bean from the context
        gameRunner.runGame(); // Now you can use the GameRunner to run the game
    }
}

Popularity 3/10 Helpfulness 7/10 Language java

Source: Grepper

Tags: annotations cdi java spring

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Contributed on Mar 24 2024

Innocent Iguana

0 Answers Avg Quality 2/10

Closely Related Answers

Would you recommed to use CDI or Spring Annotations?

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Update 2021: It's been 10 years since I answered the original question, and I'm still getting the occasional upvote. Can I just ask future readers to take my response as what it is: A reflection of the Java Enterprise landscape in 2011.

CDI stands for "context and dependency injection", while Spring is a complete ecosystem around a dependency injection container. To compare both, you have to differentiate the comparison.

Dependency injection is handled by both containers. The main difference is the fact that CDI handles DI in a dynamic (aka: stateful) way - this means that dependencies are resolved at execution time. Spring's approach is static - this means that components are wired together at creation time. While the CDI-way might seem a bit unusual at a first glimpse, it's far superior and offers way more and advanced options (I'm writing this with the background of two productive CDI apps).

If you look at the ecosystem, the situation is different: Spring comes bundled with a lot of jars (>150), while CDI is pretty small by itself. A typical CDI-usage would be inside of a Java EE 6 application server, but you can easily make it work in a servlet engine or even Java SE. This means that using CDI makes no assumption about using Hibernate, JPA, EJB or whatever - that's up to you.

If you need more functionality, CDI comes with the concept of portable extensions (which by itself makes the API worthwile). Independent extension modules like Apache CODI and Seam 3 exist and cover topics like security, mailing, reporting and more.

To summarize: CDI is nothing like a "replacement" for the Spring ecosystem, it's rather an improvement over Spring's dependency injection mechanism. It's part of Java EE 6, so if you are on a GlasFish with Java EE 6, you should definitely go for CDI. In my eyes your question is rather: Can I replace Spring with Java EE 6? I guess my answer is pretty obvious ;-)

Popularity 2/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: cdi whatever

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Contributed on Mar 01 2023

Pragya Keshap

0 Answers Avg Quality 2/10

spring cdi annotations

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