Keep on Keeping on !!: Springs - MVC, Springs Boots , Springs Security

Questions

https://howtodoinjava.com/interview-questions/top-spring-core-interview-questions-with-answers/

What is loose coupling?
What is a Dependency?
What is IOC (Inversion of Control)?
What is Dependency Injection?
Can you give few examples of Dependency Injection?
What is Auto Wiring?
What are the important roles of an IOC Container?
What are Bean Factory and Application Context?
Can you compare Bean Factory with Application Context?
How do you create an application context with Spring?
-->IOC Container
Find Beans
Wire Dependencies
Manage Lifecycle of the Bean
-->Application Context
Bean Factory++
Spring’s AOP features
I18n capabilities
WebApplicationContext for web applications etc.
How does Spring know where to search for Components or Beans?
What is a component scan?
How do you define a component scan in XML and Java Configurations?
How is it done with Spring Boot?
What does @Component signify?
What does @Autowired signify?
What’s the difference Between @Controller,@Component, @Repository, and @Service Annotations in Spring?
Answer - @Component - Spring should manage the bean.
@Autowired - Spring should find the matching bean and wire the dependency in.
@Component - Generic Component
@Repository - encapsulating storage, retrieval, and search behavior typically from a relational database.
@Service - Business Service Facade.
@Controller - Controller in MVC pattern.
What is the default scope of a bean?
A - Spring framework does not do anything under the hood concerning the multi-threaded behavior of a singleton bean. It is the developer's
responsibility to deal with concurrency issue and thread safety of the singleton bean. While practically, most spring beans have no mutable
state, and as such are trivially thread safe.
Are Spring beans thread safe?
What are the other scopes available?
How is Spring’s singleton bean different from Gang of Four Singleton Pattern?
A - The singleton scope is the default scope in Spring.
The Gang of Four defines Singleton as having one and only one instance per ClassLoader.
However, Spring singleton is defined as one instance of bean definition per container.
singleton - One instance per Spring Context
prototype - New bean whenever requested
request - One bean per HTTP request. Web-aware
Spring ApplicationContext.
session - One bean per HTTP session. Web-aware
Spring ApplicationContext
What are some of the important Spring annotations you have used?
Annotations
@Component, @Service, @Repository, @Controller
@Autowired
@Primary
@Qualifier
@Configuration
What do you think about Spring Framework? Why is Spring Popular? Can you give a big picture of the Spring Framework?
Answer :
Architecture - Flexible & No Restrictions
Design - Loosely Coupled
Code - Easy Unit Testing
Features - Dependency Injection, IOC
Container(Bean Factory & Application Context), Auto
wiring, Component Scan
Spring Modules
Spring Projects
Why Spring Boot?
Spring based applications have a lot of configuration.
When we use Spring MVC, we need to configure component scan, dispatcher servlet, a view resolver, web jars(for delivering static content) among other things.
World is moving towards Microservices.
We do not have a lot of time to set up 100 microservices.
Spring Boot Goals
Quick Start to Spring
Be opinionated
Non functional features
No code generation
Spring Projects
Spring Boot - refer the link for complete info https://learn2100.blogspot.com/2018/07/spring-boot.html
Spring Cloud
Spring Data
Spring Integration
Spring Batch
Spring Security
Spring HATEOAS
Spring Web Services
Spring Session