Java Spring Backend Developer Interview Questions
- Modularity: Lightweight and modular design.
- Inversion of Control (IoC): Manages object lifecycle and reduces coupling.
- Aspect-Oriented Programming (AOP): Modularizes cross-cutting concerns.
- Dependency Injection (DI): Promotes loose coupling and testability.
- Transaction Management: Simplifies database transactions.
- Integration: Seamlessly integrates with existing technologies.
- Enterprise Features: Provides support for security, caching, messaging, etc.
- Testability and Maintainability: Promotes unit testing and modular design.
A Spring Boot Multi-Module Project is a project structure where you organize your codebase into multiple modules, each representing a different functional or logical unit of your application. Spring Boot, a popular Java framework, provides support for creating and managing multi-module projects.
In a multi-module project, you typically have a parent module (also known as the aggregator module) and one or more child modules. The parent module coordinates the build process and manages the dependencies between the child modules.
Dependency Injection is the main functionality provided by Spring IOC(Inversion of Control). The Spring-Core module is responsible for injecting dependencies through either Constructor or Setter methods.The design principle of Inversion of Control emphasizes keeping the Java classes independent of each other and the container frees them from object creation and maintenance.
The BeanFactory Interface
This is the root interface for accessing a Spring bean container. It is the actual container that instantiates, configures, and manages a number of beans. These beans collaborate with one another and thus have dependencies between themselves.
ClassPathResource resource = new ClassPathResource("beans.xml");
XmlBeanFactory factory = new XmlBeanFactory(resource);
The ApplicationContext Interface
This interface is designed on top of the BeanFactory interface. The ApplicationContext interface is the advanced container that enhances BeanFactory functionality in a more framework-oriented style.
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Bean life cycle is managed by the spring container. When we run the program then, first of all, the spring container gets started. After that, the container creates the instance of a bean as per the request, and then dependencies are injected. And finally, the bean is destroyed when the spring container is closed.
The context path is a prefix to the URL path used to identify and differentiate between different context(s). In Spring Boot, by default, the applications are accessed by context path “/”. That means we can access the application directly at http://localhost:PORT/. For example
http://localhost:8080/
- @Around: This is the most effective advice among all other advice. The first parameter is of type ProceedingJoinPoint. Code should contain proceed() on the ProceedingJoinPoint and it causes the underlying lines of code to execute.
- @Before: This advice will run as a first step if there is no @Around advice. If @Around is there, it will run after the beginning portion of @Around.
- @After: This advice will run as a step after @Before advice if there is no @Around advice. If @Around is there, it will run after the ending portion of @Around.
- @AfterReturning: This advice will run as a step after @After advice. Usually, this is the place , where we need to inform about the successful resultant of the method.
The Spring container detects those dependencies specified in the configuration file and @ the relationship between the beans. This is referred to as autowiring in Spring. An autowired application requires fewer lines of code comparatively but at the same time, it provides very little flexibility to the programmer.
Spring Security is a framework that allows a programmer to use JEE components to set security limitations on Spring-framework-based Web applications. In a nutshell, it’s a library that can be utilized and customized to suit the demands of the programmer.
Spring IoC Container is the core of Spring Framework. It creates the objects, configures and assembles their dependencies, manages their entire life cycle. The Container uses Dependency Injection(DI) to manage the components that make up the application.
Backend Developer Interview Questions
Backend development involves working on the server side of web applications, where the logic, database interactions, and server management take place. It focuses on handling data, processing requests from clients, and generating appropriate responses.
In this Top Backend Development interview questions, We cover Interview questions from all important topics from basic to advanced such as JavaScript, Node.js, Express.js, SQL, MongoDB, Django, PHP, Java Spring, and API. No matter whether you are a fresher or an experienced professional we have got questions that will enhance your skills and help you shine in your backend development interview.
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