Spring Interview Questions and Answers for 5+ years of Experienced professionals | Code Decode

In this video of code decode most asked interview questions for spring for 5+ years of experience. We have covered mostly asked interview questions in 2023

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Explain the Dependency Injection (DI) and Inversion of Control (IoC) concepts in Spring.
Dependency Injection (DI) and Inversion of Control (IoC) are two fundamental concepts in Spring that work together to achieve loose coupling and enhance the modularity and maintainability of an application.

Inversion of Control (IoC):

Inversion of Control is a design principle where the control of object creation and management is shifted from the application itself to an external container or framework. In traditional programming, a class is responsible for creating and managing its dependencies (other objects it relies on). In contrast, with IoC, the responsibility for creating and managing objects is delegated to a container or framework.

In the context of Spring, the Spring IoC container is responsible for managing the creation and wiring of objects (beans) in the application. The container manages the lifecycle of these beans and handles their dependencies, ensuring that the right dependencies are injected into the right places. By doing so, the application code becomes more focused on its core logic, and the overall architecture becomes more flexible and maintainable

Dependency Injection (DI):

Dependency Injection is a specific implementation of the IoC principle. It is a technique used to inject the dependencies (i.e., collaborating objects or services) of a class into the class itself, rather than the class creating its dependencies. In other words, the dependencies are "injected" from the outside, typically by the IoC container.


What are some common design patterns used in Spring applications?
Singleton Pattern:

The Singleton pattern is one of the most fundamental design patterns in Spring. By default, Spring beans are singletons, meaning there is only one instance of a particular bean per Spring container. This ensures that beans are shared across the application, reducing resource usage and promoting efficient object management.

In Spring, beans can be configured as prototypes (new instance per request) or singletons, depending on the scope defined in the configuration.

Factory Pattern:

The Factory pattern is used in Spring to create and manage beans. The Spring IoC container acts as a factory that creates and manages bean instances based on their configurations in XML or Java-based configuration classes. It abstracts the process of object creation and allows for more flexible, configurable object instantiation.

Spring's FactoryBean interface and the FactoryMethod approach allow for custom factory implementations to create beans programmatically.

Dependency Injection (DI) Pattern:

Dependency Injection is a core design pattern in Spring, facilitating loose coupling between classes. It involves providing the dependencies of a class from the outside rather than the class creating them internally.

Spring's IoC container performs DI by injecting dependencies into classes either through constructor injection, setter injection, or method injection using annotations or XML configuration.

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