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Constructor Based Dependency Injection is the most recommended dependency injection technique in the Spring Framework. This technique involves passing all necessary dependencies for an object as arguments to the constructor. The object is created only after all necessary dependencies have been provided.
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Constructor-based dependency injection in Java Spring is a method of providing dependencies to a class through its constructor. This approach allows the Spring framework to manage and inject required dependencies when creating an instance of a class.
### Key Features:
1. **Immutable Dependencies**: Dependencies are provided at the time of object creation, promoting immutability.
2. **Explicit Dependencies**: The constructor clearly defines all required dependencies, making it easier to understand what a class needs to function.
3. **Spring Configuration**: You can configure dependencies using XML or Java annotations (e.g., `@Autowired`).
### Example:
```java
@Component
public class Service {
private final Repository repository;
@Autowired
public Service(Repository repository) {
this.repository = repository;
}
}
```
In this example, the `Service` class requires a `Repository` instance, which Spring provides through the constructor. This approach enhances clarity and testability in your code.
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