Important Interview Questions About Spring

Q1: Explain the Spring Framework?

Ans: It is one of the open-source application frameworks that are used in Java. Also, it is an inversion of control container. It is made to make the application design less complicated. This framework does it by handling low-level functionalities automatically. Due to this, the user can concentrate on business logic. Apart from that, it is extremely adaptable with several extension modules. So, the capabilities of spring are numerous.

It has become famous among developers because it adds up to the Enterprise JavaBeans model (EJB). Spring offers incredible functionalities, such as inversion of control and aspect-oriented programming (AOP) that are ideal if you are working with beans.

Q2: What are some benefits of Spring Framework?

Ans: The Spring framework is great for companies and financial applications. The reason behind it is that this framework has a high speed, is highly secured, and has an easy-to-build transaction process. Moreover, it is proven that it is better than Java EE or other Java-based frameworks in many aspects. Another unique feature of this framework is that it has some layers to it. Hence, you can utilize the functions you want, and ignore the ones that are not useful.

  • It facilitates POJO (Plain Old Java Object) Programming. This programming further permits continuous integration and testability.
  • Dependency Injection and Inversion of Control simplifies the way you access the database.
  • It is open-source, so there are no substantial switching costs.

Q3: What are the different features of Spring Framework?

Ans: The main features of Spring Framework that could be asked in an interview are written below:

  • Size: This framework is not heavy when we talk about size.
  • Inversion of control (IOC): rather than generating or searching for dependent objects, the objects provide their dependencies.
  • Aspect-oriented Programming (AOP): this type of programming in Spring allows cohesive development. This is done by segregating application system services and business logic.
  • Container: It forms and handles the life cycle and configuration of the objects in the application.
  • MVC Framework: This framework is highly configurable. If you don’t use this framework, you can give a try to the other ones as well.
  • Transaction Management: The Spring framework allows a generic abstraction layer for transaction management. Even in container-less environments, you can work with the transaction support by Spring.
  • JDBC Exception Handling: This provides an easy error handling technique as the JDBC abstraction layer gives an excellent hierarchy.

Q4: Explain starter dependency in Spring Boot and how is it useful?

Ans: To make the developing web application and microservices with Spring Framework quicker and simpler, a tool called spring boot is used. Sometimes, We have to deal with dependency management, that’s when the starter dependency is helpful.

There are several libraries that are used together. For instance, to make restful web services, Spring MVC with Jackson are used. Depending on the functionalities, the libraries are united into one. Because of this, you don’t have to declare many dependencies. Furthermore, you don’t experience the compatibility and version mismatch issue with this starter package. Boot will find a compatible version of the library automatically for you.

Q5: Define Spring Initializer? Also, explain its use.

Ans: When you begin to work with a framework, the first thing that you need to take care of is the initial setup. Especially, if you have little or no knowledge about it. This will help you to start without a reference setup or project. That is because, in Spring boot, the spring initializer deals with this issue.

It's a web application that allows you to build an initial Spring boot project structure. Furthermore, it will aid in creating your code by granting Maven or Gradle build files. Note that, the Spring Initializr doesn’t generate any application code. It will only give you a simple project structure.