Spring Interview Questions Answers
Spring Interview Question is i of the get-go things Java programmer should ready earlier appearing on whatever Java or Spring interview. With the immense popularity of Spring frameworks similar Spring MVC as well as Spring Boot inwards Java world, focus on Spring skills on interviews is increasing twenty-four sixty minutes catamenia past times day. For those who don't know, the Spring framework is i of the most pop structures for Java applications, which aims to simplify Java development. It revolutionized the Java evolution when it initially came amongst concepts of Dependency Injection as well as Inversion of Control, which made writing testable as well as maintainable Java application.
But the Spring framework but didn't halt there; it also provides useful API to Java programmers. The best thing is that Spring has been kept evolving since its inception as well as addressing Java developers delineate of piece of occupation concern inwards unlike areas.
Spring framework is divided into many unlike modules similar Spring MVC, Spring Integration, Spring Batch, Spring LDAP, Spring Security, Spring Boot, Spring Cloud, as well as several other modules, which focus on a special area.
For example, Spring Boot tries to acquire inwards fifty-fifty easier to exercise the Spring framework past times reducing the amount of configuration you lot demand to pose inwards for Spring itself. Spring Cloud is evolving to locomote out the best framework for developing cloud-based Java frameworks as well as Microservices, which is a demand for the future, as well as Spring Security has established itself equally the go-to framework for safety Java spider web applications.
Based on your piece of occupation experience, the Interviewer tin give notice enquire questions from heart as well as mortal Spring or these modules. That's why, piece preparing the Spring interview query focus on Spring core, Spring Security, as well as Spring API, these are principal areas from where the interviewer asks questions.
If you lot have got working sense inwards Spring-based Java projects, you lot tin give notice rapidly respond most of these Spring questions from several Java interviews. Still, if you lot don't have got whatever prior sense as well as but learning Spring, I advise you lot to locomote out through Spring Framework 5: Beginner to Guru course on Udemy to larn Spring fundamentals earlier attempting these questions.
1) What is the Spring framework? Why Java programmers should exercise the Spring framework? (answer)
Very mutual Spring interview question, Spring is a framework which helps Java programmer inwards development. Spring provides Dependency Injection as well as IOC container, Spring MVC flow, as well as several useful API for Java programmer.
2) What is the default compass of edible bean inwards the Spring framework? (answer)
The default compass of a Spring edible bean is the Singleton scope, as well as inwards the spider web application default compass of a saltation edible bean inwards asking scope. Singleton edible bean way the same instance of a edible bean is shared amongst all other beans, piece asking compass way a edible bean is endure entirely for a request.
3) Does Spring singleton beans are thread-safe?
No, Spring singleton beans are non thread-safe. Singleton doesn't hateful edible bean would be thread-safe.
4) What is the Dependency Injection blueprint pattern? (answer)
Dependency Injection is i of the blueprint patterns, which allows injecting dependency on Objects, instead of object resolving the dependency.
5) What is Inversion of Control concept, how does Spring back upward IOC? (answer)
The unproblematic pregnant of inversion of the command way that at i time the framework, Spring is responsible for creating objects, wiring dependencies, as well as managing their life-cycle instead of a developer, which was the illustration before. That's where command is inverted from developer to framework.
6) What is Spring MVC? Can you lot explicate How i asking is processed? (answer)
Spring MVC is a framework to railroad train Java spider web applications. It provides an implementation of MVC or Model View Controller architecture, which is built on the separation of concerns as well as makes the evolution of Java spider web application easy. In gild to exercise this inwards your project, you lot demand to larn Spring as well as include its JAR file.
Spring MVC framework besides supplies an inbuilt persuasion resolver for selecting views. See Spring Master Class - Beginner to Expert to larn to a greater extent than close how Spring MVC internally works.
7) What is the View Resolver pattern? how it industrial plant inwards Spring MVC
View Resolver pattern is a J2EE pattern that allows a spider web application to dynamically conduct its persuasion technology, e.g. HTML, JSP, Tapestry, JSF, XSLT, or whatever other persuasion technology.
In this pattern, View resolver holds a mapping of unlike views, controller render cite of the view, which is hence passed to View Resolver for selecting an appropriate view.
8) How do you lot create a controller inwards Spring? @Controller vs. @RestController? (answer)
Influenza A virus subtype H5N1 controller is cipher but a class, besides known equally a edible bean inwards Spring terminology. If you lot are using annotation, hence you lot tin give notice create a controller past times using @Controller annotation.
For RESTful spider web service, you lot tin give notice besides create REST controllers past times using the @RestController annotation, as well as inwards that case, you lot don't demand to exercise the @ResponseBody musical note explicitly to nation Spring how it needs to respond.
Btw, if you lot are interested inwards learning to a greater extent than close how to railroad train RESTful Web Service using Spring framework, I advise taking a expect at the REST amongst Spring course by Eugen Paraschiv of Baeldung. It's i of the comprehensive class which non entirely covers basics but besides advanced concept similar versioning, testing, as well as deploying REST API inwards production.
9) What types of dependency injection are supported past times Spring Framework? When do you lot exercise Setter as well as Constructor Injection, the pros as well as cons?
There are two types of dependency injection supported past times Spring, constructor based injection, as well as setter-based injection.
Both types have got their ain advantages as well as disadvantages; you lot should exercise Constructor injection when an object's dependencies are non optional, as well as they must endure initialized amongst their dependencies.
Also, exercise constructor injection if the gild of initialization or dependency matters because, inwards Setter based injection, you lot cannot impose whatever order. Use setter injection when dependencies are optional. See the difference betwixt setter vs. constructor injection inwards Spring for a to a greater extent than detailed answer.
10) Can nosotros exercise to a greater extent than than i configuration file for our Spring project?
Yes, you lot tin give notice exercise equally many equally you lot want, all you lot demand to is import them inwards the principal Spring configuration file which you lot volition charge from your program.
11) What is Spring Security?
Spring safety is a projection nether the saltation framework umbrella, which provides back upward for safety requirements of firm Java projects.
Spring Security, formerly known equally aegis security, provides out of box back upward for creating a login screen, Remember me cookie support, securing URL, authentication provider to authenticate the user from the database, LDAP as well as inwards memory, Concurrent Active Session management back upward as well as much more.
In gild to exercise Spring safety inwards a Spring MVC based project, you lot demand to include spring-security.jar as well as configure it inwards the application-Context-security.xml file, you lot tin give notice cite it whatever you lot want, but brand certain to render this to ContextLoaderListener, which is responsible for creating Spring context as well as initializing dispatcher servlet. You tin give notice farther encounter Learn Spring Security Certification Class larn to a greater extent than close authentication, authorization, as well as session command using Spring Security.
12) What is the deviation betwixt ApplicationContext as well as BeanFactory inwards Spring framework? (answer)
13) How do you lot telephone band a stored physical care for past times using the Spring framework? (answer)
14) What do the JdbcTemplate as well as JmsTemplate class offering inwards Spring? (answer)
They offering a criterion way to exercise JDBC as well as JMS API, without writing the boiler code required to piece of occupation amongst those API.
15) How do you lot command concurrent Session on Java spider web application using Spring Security? (answer)
You tin give notice exercise Spring Security to command a release of active sessions inwards Java spider web application. Spring safety framework provides this characteristic out of the box, as well as when enabled, a user tin give notice entirely have got i active session at a time.
16) Explain Spring MVC stream amongst a unproblematic illustration similar starting from Container receives a asking as well as forrad to your Java application?
I have got explained to them from start to halt inwards my article how does Spring MVC industrial plant article internally; you lot tin give notice banking company gibe that for a detailed answer.
17) What is the deviation betwixt Spring MVC as well as Spring core?
The Spring MVC is component of the Spring framework, which helps you lot to railroad train Java spider web application using model spider web controller pattern, piece Spring Core provides the Dependency injection as well as Inversion of Control. The Spring Container is component of Spring core.
Both functionalities come upward inwards unlike JAR files. If you lot are developing but a heart as well as mortal Java application using Spring, hence you lot but demand Spring Core, but if you lot are developing a Web application, hence you lot demand spring-mvc.jar equally well. See answer)
24) Difference betwixt @SpringBootApplication as well as @ContextConfiguration musical note inwards Spring Boot? (answer)
25) What is the exercise of DispatcherServlet inwards Spring MVC? (answer)
26) What is the role of InternalResourceViewResolver inwards Spring MVC (answer)
27) What is the deviation betwixt @Autowired as well as @Inject musical note inwards Spring? (answer)
28) Difference betwixt @RequestParam as well as @PathVariable inwards Spring MVC? (answer)
Spring Interview Question is i of the get-go things Java programmer should ready earlier appearing on whatever Java or Spring interview. With the immense popularity of Spring frameworks similar Spring MVC as well as Spring Boot inwards Java world, focus on Spring skills on interviews is increasing twenty-four sixty minutes catamenia past times day. For those who don't know, the Spring framework is i of the most pop structures for Java applications, which aims to simplify Java development. It revolutionized the Java evolution when it initially came amongst concepts of Dependency Injection as well as Inversion of Control, which made writing testable as well as maintainable Java application.
But the Spring framework but didn't halt there; it also provides useful API to Java programmers. The best thing is that Spring has been kept evolving since its inception as well as addressing Java developers delineate of piece of occupation concern inwards unlike areas.
Spring framework is divided into many unlike modules similar Spring MVC, Spring Integration, Spring Batch, Spring LDAP, Spring Security, Spring Boot, Spring Cloud, as well as several other modules, which focus on a special area.
For example, Spring Boot tries to acquire inwards fifty-fifty easier to exercise the Spring framework past times reducing the amount of configuration you lot demand to pose inwards for Spring itself. Spring Cloud is evolving to locomote out the best framework for developing cloud-based Java frameworks as well as Microservices, which is a demand for the future, as well as Spring Security has established itself equally the go-to framework for safety Java spider web applications.
Based on your piece of occupation experience, the Interviewer tin give notice enquire questions from heart as well as mortal Spring or these modules. That's why, piece preparing the Spring interview query focus on Spring core, Spring Security, as well as Spring API, these are principal areas from where the interviewer asks questions.
If you lot have got working sense inwards Spring-based Java projects, you lot tin give notice rapidly respond most of these Spring questions from several Java interviews. Still, if you lot don't have got whatever prior sense as well as but learning Spring, I advise you lot to locomote out through Spring Framework 5: Beginner to Guru course on Udemy to larn Spring fundamentals earlier attempting these questions.
Spring Interview Questions as well as Answers
Now that you lot know the importance of Spring Framework for Java developers as well as ready to have got on Spring questions on your side past times side interview, let's encounter but about often asked questions on the Spring framework on Java interviews:1) What is the Spring framework? Why Java programmers should exercise the Spring framework? (answer)
Very mutual Spring interview question, Spring is a framework which helps Java programmer inwards development. Spring provides Dependency Injection as well as IOC container, Spring MVC flow, as well as several useful API for Java programmer.
2) What is the default compass of edible bean inwards the Spring framework? (answer)
The default compass of a Spring edible bean is the Singleton scope, as well as inwards the spider web application default compass of a saltation edible bean inwards asking scope. Singleton edible bean way the same instance of a edible bean is shared amongst all other beans, piece asking compass way a edible bean is endure entirely for a request.
3) Does Spring singleton beans are thread-safe?
No, Spring singleton beans are non thread-safe. Singleton doesn't hateful edible bean would be thread-safe.
4) What is the Dependency Injection blueprint pattern? (answer)
Dependency Injection is i of the blueprint patterns, which allows injecting dependency on Objects, instead of object resolving the dependency.
5) What is Inversion of Control concept, how does Spring back upward IOC? (answer)
The unproblematic pregnant of inversion of the command way that at i time the framework, Spring is responsible for creating objects, wiring dependencies, as well as managing their life-cycle instead of a developer, which was the illustration before. That's where command is inverted from developer to framework.
6) What is Spring MVC? Can you lot explicate How i asking is processed? (answer)
Spring MVC is a framework to railroad train Java spider web applications. It provides an implementation of MVC or Model View Controller architecture, which is built on the separation of concerns as well as makes the evolution of Java spider web application easy. In gild to exercise this inwards your project, you lot demand to larn Spring as well as include its JAR file.
Spring MVC framework besides supplies an inbuilt persuasion resolver for selecting views. See Spring Master Class - Beginner to Expert to larn to a greater extent than close how Spring MVC internally works.
7) What is the View Resolver pattern? how it industrial plant inwards Spring MVC
View Resolver pattern is a J2EE pattern that allows a spider web application to dynamically conduct its persuasion technology, e.g. HTML, JSP, Tapestry, JSF, XSLT, or whatever other persuasion technology.
In this pattern, View resolver holds a mapping of unlike views, controller render cite of the view, which is hence passed to View Resolver for selecting an appropriate view.
8) How do you lot create a controller inwards Spring? @Controller vs. @RestController? (answer)
Influenza A virus subtype H5N1 controller is cipher but a class, besides known equally a edible bean inwards Spring terminology. If you lot are using annotation, hence you lot tin give notice create a controller past times using @Controller annotation.
For RESTful spider web service, you lot tin give notice besides create REST controllers past times using the @RestController annotation, as well as inwards that case, you lot don't demand to exercise the @ResponseBody musical note explicitly to nation Spring how it needs to respond.
Btw, if you lot are interested inwards learning to a greater extent than close how to railroad train RESTful Web Service using Spring framework, I advise taking a expect at the REST amongst Spring course by Eugen Paraschiv of Baeldung. It's i of the comprehensive class which non entirely covers basics but besides advanced concept similar versioning, testing, as well as deploying REST API inwards production.
9) What types of dependency injection are supported past times Spring Framework? When do you lot exercise Setter as well as Constructor Injection, the pros as well as cons?
There are two types of dependency injection supported past times Spring, constructor based injection, as well as setter-based injection.
Both types have got their ain advantages as well as disadvantages; you lot should exercise Constructor injection when an object's dependencies are non optional, as well as they must endure initialized amongst their dependencies.
Also, exercise constructor injection if the gild of initialization or dependency matters because, inwards Setter based injection, you lot cannot impose whatever order. Use setter injection when dependencies are optional. See the difference betwixt setter vs. constructor injection inwards Spring for a to a greater extent than detailed answer.
10) Can nosotros exercise to a greater extent than than i configuration file for our Spring project?
Yes, you lot tin give notice exercise equally many equally you lot want, all you lot demand to is import them inwards the principal Spring configuration file which you lot volition charge from your program.
11) What is Spring Security?
Spring safety is a projection nether the saltation framework umbrella, which provides back upward for safety requirements of firm Java projects.
Spring Security, formerly known equally aegis security, provides out of box back upward for creating a login screen, Remember me cookie support, securing URL, authentication provider to authenticate the user from the database, LDAP as well as inwards memory, Concurrent Active Session management back upward as well as much more.
In gild to exercise Spring safety inwards a Spring MVC based project, you lot demand to include spring-security.jar as well as configure it inwards the application-Context-security.xml file, you lot tin give notice cite it whatever you lot want, but brand certain to render this to ContextLoaderListener, which is responsible for creating Spring context as well as initializing dispatcher servlet. You tin give notice farther encounter Learn Spring Security Certification Class larn to a greater extent than close authentication, authorization, as well as session command using Spring Security.
12) What is the deviation betwixt ApplicationContext as well as BeanFactory inwards Spring framework? (answer)
13) How do you lot telephone band a stored physical care for past times using the Spring framework? (answer)
14) What do the JdbcTemplate as well as JmsTemplate class offering inwards Spring? (answer)
They offering a criterion way to exercise JDBC as well as JMS API, without writing the boiler code required to piece of occupation amongst those API.
15) How do you lot command concurrent Session on Java spider web application using Spring Security? (answer)
You tin give notice exercise Spring Security to command a release of active sessions inwards Java spider web application. Spring safety framework provides this characteristic out of the box, as well as when enabled, a user tin give notice entirely have got i active session at a time.
16) Explain Spring MVC stream amongst a unproblematic illustration similar starting from Container receives a asking as well as forrad to your Java application?
I have got explained to them from start to halt inwards my article how does Spring MVC industrial plant article internally; you lot tin give notice banking company gibe that for a detailed answer.
17) What is the deviation betwixt Spring MVC as well as Spring core?
The Spring MVC is component of the Spring framework, which helps you lot to railroad train Java spider web application using model spider web controller pattern, piece Spring Core provides the Dependency injection as well as Inversion of Control. The Spring Container is component of Spring core.
Both functionalities come upward inwards unlike JAR files. If you lot are developing but a heart as well as mortal Java application using Spring, hence you lot but demand Spring Core, but if you lot are developing a Web application, hence you lot demand spring-mvc.jar equally well. See answer)
24) Difference betwixt @SpringBootApplication as well as @ContextConfiguration musical note inwards Spring Boot? (answer)
25) What is the exercise of DispatcherServlet inwards Spring MVC? (answer)
26) What is the role of InternalResourceViewResolver inwards Spring MVC (answer)
27) What is the deviation betwixt @Autowired as well as @Inject musical note inwards Spring? (answer)
28) Difference betwixt @RequestParam as well as @PathVariable inwards Spring MVC? (answer)
29) Difference betwixt @Component, @Service, @Controller, as well as @Repository annotations inwards Spring MVC? (answer)
30) How to eat RESTful Web Service using Spring MVC? (answer)
31) Difference betwixt @SpringBootApplication as well as @EnableAutoConfiguration annotations inwards Spring Boot? (answer)
These were but about of the Core Spring framework as well as MVC Interview questions from my collection, I have got given brusk answers for most of these Spring interview question. I advise to inquiry to a greater extent than or read along those Spring query to ready for follow-up Spring interview questions. Some Spring MVC questions are tricky similar Struts as well as Spring integration as well as tin give notice endure entirely answered past times experienced Java plan amongst two to 4-year sense inwards the Spring MVC framework.
Further Reading
Spring Framework 5: Beginner to Guru
The 2020 Java Developer RoadMap10 Spring MVC as well as REST annotations for Java Programmers 20+ Advanced Spring MVC Interview Questions 20 Spring REST Interview Questions for Java developers 10 Java Coding Interview Questions as well as Answer 5 Books to larn Spring Framework better How to implement Role-based access command inwards Spring? Difference betwixt Dependency Injection as well as Factory Pattern 10 Things Java Developers Should Learn 5 Java as well as Web Development Frameworks You tin give notice learn
P.S. - If you lot desire to larn Spring five as well as Spring Boot two from scratch, inwards a guided, code-focused way the I besides advise you lot banking company gibe out Eugen Paraschiv's Learn Spring: The Master Class. He has late launched this class afterward 2.5 years, which is total of exercises as well as examples to farther cement the real-world concepts you lot volition larn from the course.
30) How to eat RESTful Web Service using Spring MVC? (answer)
31) Difference betwixt @SpringBootApplication as well as @EnableAutoConfiguration annotations inwards Spring Boot? (answer)
These were but about of the Core Spring framework as well as MVC Interview questions from my collection, I have got given brusk answers for most of these Spring interview question. I advise to inquiry to a greater extent than or read along those Spring query to ready for follow-up Spring interview questions. Some Spring MVC questions are tricky similar Struts as well as Spring integration as well as tin give notice endure entirely answered past times experienced Java plan amongst two to 4-year sense inwards the Spring MVC framework.
Further Reading
Spring Framework 5: Beginner to Guru
The 2020 Java Developer RoadMap
P.S. - If you lot desire to larn Spring five as well as Spring Boot two from scratch, inwards a guided, code-focused way the I besides advise you lot banking company gibe out Eugen Paraschiv's Learn Spring: The Master Class. He has late launched this class afterward 2.5 years, which is total of exercises as well as examples to farther cement the real-world concepts you lot volition larn from the course.
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