For a few years Spring has been the most popular server-side frameworks in the developer community. Since it is being used widely the number of job opportunities has been on the rise. This rise can be seen as the number of libraries related to Spring in Github is increasing, where out of 100 Github libraries 15 of them are Spring related. Also, developers are able to create Spring applications and several services with ease. Today the need of the hour for the Java developers looking for impressive growth is to learn Spring Framework.
Ans: Dependency Injection is a design pattern in Spring where the Spring IoC container supplies a dependent object (bean) with the required dependencies. This helps in achieving loose coupling between classes.
Ans: Inversion of Control (IoC) in Spring refers to the technique where the control over object creation and management is transferred from the application code to the Spring container. The container manages the objects of the application, including instantiating and configuring these objects.p>
Ans: There are two types of Dependency Injection in Spring: Constructor Injection and Setter Injection. Constructor Injection involves passing dependencies through a class constructor, while Setter Injection involves setting the dependencies using setter methods.
Ans: Bean Wiring in Spring is the process of defining the relationships between beans in the Spring container. This can be achieved through XML configuration, Java annotations, or Java-based configuration.
Ans: The Spring Container is responsible for managing the lifecycle of Spring beans, including their instantiation, configuration, and assembly. There are two types of Spring containers: BeanFactory and ApplicationContext.
Ans:Singleton scope means that Spring container creates only one instance of the bean, and it's shared among all the requests. Prototype scope means that a new instance is created every time the bean is requested.
Ans: The Spring Bean lifecycle consists of several phases: bean instantiation, bean population, bean initialization, and destruction of the bean. Initialization methods are called after bean instantiation, and destruction methods are called before the bean is removed from the container.
Ans:Aspect-Oriented Programming (AOP) is a programming paradigm that allows modularizing cross-cutting concerns such as logging, security, and transactions. In Spring, AOP is used to achieve method interception and add behaviors to methods.
Ans: DispatcherServlet is the front controller in Spring MVC that receives all incoming requests and delegates them to the appropriate controllers for handling. It centralizes request processing and manages the flow of the Spring MVC application.
Ans:When a request is received, DispatcherServlet maps it to the appropriate handler mapping, which then delegates the request to the corresponding controller. The controller processes the request, interacts with the model and view, and returns the response, which is rendered back to the client.
Ans: The Spring Framework is an open-source framework for building enterprise-level applications in Java. It provides comprehensive infrastructure support and promotes good design practices and coding standards.
Ans:The key features of the Spring Framework include Dependency Injection, Aspect-Oriented Programming, Data Access, Transaction Management, Model-View-Controller (MVC) framework, Security, and more. These features simplify Java development and promote modular and testable code.
Ans: Dependency Injection is a design pattern used in Spring to achieve Inversion of Control (IoC). It allows objects to be injected into a class, reducing the dependency on hard-coded components and making the system more maintainable and testable.
Ans: AOP in Spring allows developers to define custom aspects (cross-cutting concerns) such as logging, security, and transactions. These aspects can be applied across the application, promoting modularization of concerns and making the codebase more manageable.
Ans: Spring MVC is a framework built on top of the Spring Framework that follows the MVC design pattern. It separates the application into Model (data), View (presentation), and Controller (handling user input), making the development process more organized and efficient.
Ans:Spring provides various data access technologies such as JDBC, ORM frameworks like Hibernate and JPA, and data access abstraction through Spring Data. These technologies simplify database interactions and reduce boilerplate code in applications.
Ans: Spring Security is a robust and customizable authentication and access control framework for Java applications. It provides comprehensive security services for Java EE-based enterprise software applications, ensuring secure authentication and authorization mechanisms.
Ans:Spring offers a consistent programming model for transaction management, supporting both programmatic and declarative transaction management. It simplifies the handling of transactions across different types of transactional resources, ensuring data integrity and consistency.
Ans:While Spring is primarily associated with Java applications, there are extensions and projects (such as Spring for .NET) that allow integration with other languages and platforms. However, the core Spring Framework is primarily used for Java applications.
Ans: There are numerous online resources, tutorials, documentation, and books available to learn the Spring Framework. Websites like the official Spring Framework website (spring.io) offer extensive documentation and guides. Additionally, online learning platforms like Coursera, Udemy, and Pluralsight offer courses specifically focused on Spring Framework development. Books such as "Spring in Action" by Craig Walls and "Pro Spring 5" by Iuliana Cosmina are also excellent resources for in-depth learning.