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Spring / Spring interview questions

Explain Spring Framework.

Spring is an open source framework that provides comprehensive infrastructure support for developing Java applications. It provides libraries of classes which make it easier to develop tasks such as transaction management, database integration, and web applications and create the help to address the complexity of the development of enterprise application.

Spring is a light weight inversion of control and aspect-oriented container framework.

  • Lightweight. Spring is lightweight when it comes to API size and transparency. The basic version of spring framework is around 1MB and the processing overhead is also very minimal.
  • Inversion of control (IoC). Loose coupling is achieved in spring using the technique Inversion of Control. The objects give their dependencies instead of creating or looking for dependent objects.
  • Framework. Spring provides most of the core functionality and features, leaving rest of the coding to the developer.
  • Aspect oriented (AOP). Spring supports Aspect-oriented programming and enables cohesive development by separating application business logic from system services.

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Explain Spring Framework. What are the advantages of using Spring Framework? What are the different modules in Spring framework? Explain lifecycle of a bean in Spring framework. What is the difference between singleton and prototype bean? What are the types of Dependency Injection Spring supports? What is Bean Factory in Spring? How do I decide between when to use prototype scope and singleton-scoped bean? Different types of IOC. Difference between BeanFactory and ApplicationContext in spring. Type of transaction Management in spring. When do you use programmatic and declarative transaction management? What is Bean Wiring? Types of IoC containers. Explain Aspect oriented Programming. Explain different modes of bean autowiring in Spring Framework. How do I enable annotation based auto wiring in Spring Framework? What is Dependency Injection in Spring framework? Which DI should I prefer, Constructor-based or setter-based in spring? What is Spring annotation? Spring: What are Lazily-instantiated beans? Difference between the setter and constructor injection in Spring. Difference between Dependency Injection and Factory Pattern. What is the default scope of Spring bean? Mention the steps to create a Web application using Spring. How do you create bean for class with constructor having arguments? How does Spring achieve loose coupling? Can we use a final class as spring bean? When Spring creates a CGLIB proxy? When Spring creates a JDK dynamic proxy? Is Spring DTD/XSD mandatory for XML validation? Where I can find the Spring DTD? The main difference between JDK dynamic proxy and CGLib. How do I Inject value into static variables in Spring bean? Can we inject a eum to spring bean? Is spring prototype bean threadsafe? Is request scoped spring beans threadsafe? What is the preferred bean scope for DAO, Service and Controller? Difference between Java bean and spring bean. Mention an alternate DI framework like Spring. How to deploy a Spring Boot project to the Application Server (non-embedded)? What does the word "Actuator" in spring boot refer to? How do I instantiate Spring bean by passing constructor-args programmatically? What is the purpose of @ControllerAdvice Annotation?
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