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Spring Interview Questions

What are the features of Spring Framework?

  • Spring framework follows layered architecture pattern that helps in the necessary components selection along with providing a robust and cohesive framework for J2EE applications development.
  • The AOP (Aspect Oriented Programming) part of Spring supports unified development by ensuring separation of application’s business logic from other system services.
  • Spring provides highly configurable MVC web application framework which has the ability to switch to other frameworks easily.
  • Provides provision of creation and management of the configurations and defining the lifecycle of application objects.
  • Spring has a special design principle which is known as IoC (Inversion of Control) that supports objects to give their dependencies rather than looking for creating dependent objects.
  • Spring is a lightweight, java based, loosely coupled framework.
  • Spring provides generic abstraction layer for transaction management that is also very useful for container-less environments.
  • Spring provides a convenient API to translate technology-specific exceptions (thrown by JDBC, Hibernate or other frameworks) into consistent, unchecked exceptions. This introduces abstraction and greatly simplifies exception handling.
Spring Interview Questions

What role does the @ModelAttribute annotation play?

Annotation plays a very important role in binding method parameters to the particular attribute that corresponds to a model. Then reflect the same on the presentation page. The function of the annotation also depends on what the developer is using it for. If used at the method level, this method is responsible for adding attributes to it. When used at the parameter level, it means that the parameter value should be obtained from the model layer.

Differentiate between Spring Boot and Spring Boot

Spring Framework has multiple features like Dependency Injection, Data Binding, Aspect Oriented Programming (AOP), Data Access, and many more that make web application development easy, while Spring Boot helps make Spring Framework easier to use, spring blocks that are boring and that Have the potential to get messy. Spring Boot simplifies commonly used Spring dependencies and runs applications directly from a command line. It also does not require an app container and helps to monitor various components and configure them externally.

What is the meaning of web.xml in Spring MVC?

web.xml is also known as the deployment descriptor and contains definitions of the servlets and their lifecycle assignments, filters and listeners. It is also used to configure the ContextLoaderListener. Whenever the application is deployed, the servlet container creates a ContextLoaderListener instance that leads to a WebApplicationContext load.

Are Singleton Beans Thread Safe?

No, singleton beans are not thread safe because the concept of thread safety essentially relates to program execution and singleton is simply a design pattern intended for creating objects. The thread safety of a bean depends on how it is implemented.

What does the @Repository annotation mean?

The @Repository annotation indicates that a component is being used as a repository that is used to store, search, or retrieve data. These can be added to DAO classes.

How can thread security be achieved in beans?

Thread safety can be achieved by changing the scope of the bean on request, session, or prototype, but at the expense of performance. This is based solely on the requirements of the project.

What is the difference between constructor injection and setter injection?

No.Constructor InjectionSetter Injection
1)No Partial InjectionPartial Injection
2)Desn’t override the setter propertyOverrides the constructor property if both are defined.
3)Creates new instance if any modification occursDoesn’t create new instance if you change the property value
4)Better for too many propertiesBetter for few properties.

How do you instantiate the dispatcher servlet?

The dispatcher servlet is instantiated by servlet containers such as Tomcat. The dispatcher servlet must be defined in web.xml. The DispatcherServlet is instantiated by servlet containers like Tomcat. The dispatcher servlet can be defined in web.xml as shown below:



 
 
   appServlet
   org.springframework.web.servlet.DispatcherServlet
   
     contextConfigLocation
     /WEB-INF/spring/appServlet/servlet-context.xml
   
   1
 

 
   InterviewBitServlet
   /
 


Here is the load-on startup tag 1, which indicates that a DispatcherServlet instance will be created when the Spring MVC application is sent to the servlet container. During this process, it looks for the servlet-name-context.xml file and initializes the beans defined in the file.

How do I add a bean in the spring application?

Look at the following example:




   
      
   


What is controller in Spring MVC framework?

Controllers provide access to application behavior that you typically define through a service interface. Controllers interpret user input and convert it into a model that is presented to the user through the view. Spring implements a controller in a very abstract way, allowing you to create a variety of controllers.

How can JdbcTemplate be used?

Using the Spring JDBC framework significantly reduces resource management and error handling overhead. Therefore, it is up to the developers to write the statements and queries to get the data in and out of the database. JdbcTemplate provides many convenient ways to provide things like converting database data to primitives or objects, executing prepared and callable statements, and providing custom database error handlers.

What does @autowired note mean?

This annotation provides more precise control over where and how automatic wiring should be done. The @autowired annotation can be used to automatically connect the bean to the setter method, as can the @required annotation, constructor, property, or methods with any name and / or multiple arguments.

What is Spring MVC Framework?

Spring-Web-MVC-Framework provides a ready-to-use component and model view controller architecture with which to develop loosely coupled and flexible web applications. The MVC pattern separates the various aspects of the application (input logic, business logic, and user interface logic) while at the same time providing a flexible coupling between these elements.

What is the aspect

A module with a set of APIs that meet the general requirements. For example, a registration module would be called the AOP aspect for registration. An application can have several aspects, depending on the requirements. In Spring AOP, aspects are implemented using regular classes (the schema-based approach) or regular classes annotated with the @Aspect annotation (@ AspectJ style).

What is Automatic Bean Wiring?

The Spring container can automatically connect the relationships between the collaborating beans. This means that it is possible for Spring Collaborators (other beans) to automatically resolve your bean by examining the content of the BeanFactory without using the and elements.

Spring Interview Questions 2021

Dear Readers, These spring interview questions are specifically designed to familiarize you with the questions you may encounter during your spring interview. In my experience, good interviewers rarely plan to ask a specific question during their interview; Questions usually start with a basic concept of the topic and continue later based on further discussion and your answer:

Whats Next?

Also, you can go over your previous assignments on the subject and make sure you can safely talk about it. When you are cooler, the interviewer does not expect you to answer very complex questions, but needs to strengthen your basic concepts. Second, it doesn’t matter if you can’t answer some questions, but it is important that you have answered everything you answered with confidence. So feel confident during your interview. At tutorialspoint we wish you the best of luck in having a good interviewer and all the best for your future role. Spring Framework was first developed by Rod Johnson in 2003. It is designed to make Java application development faster, easier, and more secure for developers. Spring Framework is a lightweight and easy to build open source framework that can also be thought of as a framework framework as it supports different frameworks like Dependency Injection, Spring MVC, Spring JDBC, Spring Hibernate, Spring AOP, EJB, JSF, etc. hosts. A key element of Spring is the application’s infrastructure support function. Spring focuses on providing the "installation" of applications at the enterprise level, ensuring that developers can focus solely on the business logic at the application level, with no unnecessary ties to specific deployment environments. Applications developed in Spring are more reliable, scalable, and very easy to build and maintain. Spring is designed to help developers manage application business objects. Because of its extensive functionality and flexibility, Spring has become the most popular framework for developing Java-based enterprise-class applications.

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