About the Course

What we study in the course

Spring is not a single library and not just a collection of annotations. It is a large ecosystem that helps assemble a Java application from connected components, work with HTTP, databases, transactions, security, tests, and other common backend development tasks. That is why the course starts with Spring Core fundamentals and gradually moves toward the mechanisms developers encounter in real projects.

To make the theory easier to understand and remember, the course uses schemes, illustrations, and small examples that show the relationships between application components.

To reinforce practical skills, the course uses different types of exercises:

• Multiple-choice test;
• Complete a code fragment;
• Put the steps in the correct order;
• Match terms with definitions;
• Enter an exact answer;
• Select the incorrect line;
• Write complete code.

Different practice formats make you look at the same topic from different angles: sometimes you need to recall a definition, sometimes trace a lifecycle, and sometimes write or fix the code yourself.

Course roadmap

So that Spring does not feel like a collection of unrelated modules, the course moves from the foundation toward complete parts of a backend application:

• Spring foundation. The IoC container, beans, dependency injection, configuration, lifecycle, and how Spring manages application objects.
• Building an application. Spring Boot, application configuration, MVC, REST, validation, and handling common web scenarios.
• Working with infrastructure. Data access, transactions, security, testing, and other mechanisms that turn separate components into a working service.

The topics are ordered so that new mechanisms build on what has already been covered. If, at a later stage, it is unclear where a bean came from or why a dependency is injected in a particular way, it is often useful to return to Spring Core and check the foundation.

How we explain code

Examples stay small: one fragment — one main idea. That makes it easier to see Spring's role instead of getting lost in a large amount of infrastructure code.

@Service
public class GreetingService {

    public String greet() {
        return "Hello, Spring!";
    }
}

The important thing here is not simply to notice the @Service annotation, but to understand its meaning: the class becomes a Spring component, and its object is managed by the container. Later, we will look closely at how Spring finds these classes, creates them, and connects them together.