Category: Spring

Spring

Spring Boot: Building a RESTful Web Application

Introduction: REST stands for Representational State Transfer and is an architectural guideline for API design. We assume that you already have a background in building RESTful APIs. In this tutorial, we’ll design a simple Spring Boot RESTful web application, exposing a few REST endpoints. Project Setup: Let’s start by downloading the project template via Spring […]

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Spring

Spring Boot with H2 Database

Introduction: In this quick tutorial, we’ll bootstrap a simple Spring Boot application backed by an in-memory H2 database. We’ll use the Spring Data JPA to interact with our database. Project Setup: Firstly, let’s generate our project template using Spring Initializr: On clicking the ‘Generate the project’ link, our project files will get downloaded. Now, if […]

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Spring

@SpringBootConfiguration Annotation in Spring Boot

Introduction: @SpringBootConfiguration annotation in Spring Boot is a class-level annotation which indicates that this class provides the application configuration. Generally, the class with the main() method is best-suited for this annotation. We usually use @SpringBootApplication annotation which automatically inherits the @SpringBootConfiguration annotation. Annotation Usage: When we mark a class with @SpringBootConfiguration, it means that the […]

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Spring

Spring Boot CommandLineRunner and ApplicationRunner

Introduction: In this quick tutorial, we’ll explore the two very popular interfaces in Spring Boot: CommandLineRunner and ApplicationRunner. One common use case of these interfaces is to load some static data at application startup. Though, I have seen such usages mostly for test data setup only. Both of them are functional interfaces with a run() […]

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Spring

Introduction to Spring Boot

Introduction: In this tutorial, we’ll take a look at Spring Boot and see how it’s different from the Spring framework. We’ll also discuss various features offered by Spring Boot. What is the Spring Boot? Spring is a powerful framework when it comes to developing enterprise-level applications. It provides us with features like dependency injection along […]

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Spring

Spring Bean Scopes

Introduction: Spring core container instantiates beans and manages their life-cycle. While defining a bean, we can provide its scope. Unless explicitly provided, singleton is the default scope of beans in a Spring container. We have five types of bean scopes available in Spring. In this tutorial, we’ll explore each of them. 1. singleton: The singleton […]

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Spring

Spring Boot YAML Configuration

Introduction: In this quick tutorial, we’ll learn how to use a YAML file to configure properties of a Spring Boot application. What is YAML File? Instead of having an application.properties in Spring, we can use the application.yml as our configuration file. YAML is a superset of JSON and we can use it for configuring data. The […]

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Spring

Spring ClassPathXmlApplicationContext

Introduction: Spring provides two types of containers: BeanFactory: It supports bean instantiating and wiring ApplicationContext: It extends the BeanFactory and so provides all those features as that a BeanFactory. Additionally, it provides automatic registration of BeanPostProcessor, internationalization, and many more features The Spring container is responsible for instantiating and managing the lifecycle of Spring beans. […]

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Spring

Spring Dependency Injection

Introduction: In a well-designed Java application, the classes should be as independent as possible. Such a design promotes reusability of components. It also makes it easier to unit test the various components. The concept of dependency injection promotes loose coupling among Java objects. In this tutorial, we’ll talk about the dependency injection in Spring framework. […]

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Spring

Spring @Value Annotation

Introduction: Spring @Value annotation is used to inject values into variables and method arguments. We can either read spring environment variables or system variables. It also supports SpEL. In this quick tutorial, we’ll explore how to work with Spring @Value annotation. Setup: Let’s start by first defining a few properties in our app.properties file:

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