Additional Notes
How does Spring Boot handle bean instantiation order with constructor injection?
Track: Java
Topic: Dependency Injection
Focus: Constructor vs Field Injection
Java: Constructor vs Field Injection
Answer
Spring resolves constructor-injected dependencies before instantiation.
Spring Boot ensures that all dependencies required by a constructor are resolved and instantiated before the bean itself is created. This guarantees that any bean with constructor-injected dependencies is fully constructed with all its required collaborators ready. For example, a service class with a constructor dependency on a repository will have the repository bean ready when the service is initialized.
Spring Boot ensures that all dependencies required by a constructor are resolved and instantiated before the bean itself is created. This guarantees that any bean with constructor-injected dependencies is fully constructed with all its required collaborators ready. For example, a service class with a constructor dependency on a repository will have the repository bean ready when the service is initialized.
Topics: Constructor vs Field Injection Dependency Injection Java