What is Spring Boot in Java? Spring Boot Framework Guide

What is Spring Boot in Java? Spring Boot Framework Guide
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In this modern technology space, every tech expert is looking for reliable and fast frameworks that enable a flawless development environment. Especially for Java-based applications, countless development environments can be used to develop them more efficiently. However, developing a standalone application that serves quality with responsiveness, Spring Boot is one of the frameworks that offer more than just quality.

Spring Boot is a popular framework in the world of Java development. If you're a Java developer looking to build efficient, robust, and scalable applications, you've come to the right place!

Spring Boot Developers

In this guide, we'll provide a detailed overview of Spring Boot and other aspects, along with its features and benefits. We'll also cover the key concepts and best practices for using Spring Boot effectively.

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So, whether you're a seasoned developer or just getting started, this guide will help you understand everything you need to know about Spring Boot and how it can make your Java development experience smoother and more productive. So, let's dive in and explore the world of Spring Boot!

What Is Spring Boot?

Spring Boot is a popular, open-source, and enterprise-level framework for creating standalone and production-grade applications that run on a (JVM) Java Virtual Machine. Spring Boot is a tool that makes developing web applications and microservices with Spring framework more efficient and fast.

Applications developed using the Spring Boot framework can just run on any Java platform. The spring boot contains many features that make this platform easier to use, enabling faster application deployment. With it, developers can get started quickly without wasting time preparing and configuring their Spring applications.

What are the Three Core Capabilities That Make Spring Boot Faster & Easier?

Spring Boot is an optimal choice for developing web-based Java applications; therefore, more and more Java developers like using this framework. It has three major core capabilities that make Spring Boot a faster and more effective platform for developing applications that can run without any complications on any platform. The three core capabilities are:

1. Autoconfiguration

2. An opinionated approach to configuration

3. The ability to create standalone applications

These core features of Spring Boot allow you to work together with its core functionalities and set up a spring-based application with minimal configuration. Later on, we will understand these three spring boot core capabilities more in-depth, but for now, let’s see what the productive benefits Spring Boot offers developers are.

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Spring Boot Framework Benefits

Spring Boot is a popular Java-based web framework that provides several benefits for developers, including:

Rapid Application Development: Spring Boot provides a simple and easy-to-use framework that allows developers to create web applications quickly. With Spring Boot, developers can get started quickly without worrying about configuring various settings.

Microservices Architecture: Spring Boot is designed for building microservices-based applications. It supports a variety of architectures, including RESTful web services, messaging systems, and event-driven systems.

Convention over Configuration: Spring Boot follows the "convention over configuration" principle, which means that developers can get started quickly without having to worry about configuring many settings. Spring Boot provides sensible defaults that work well for most applications, but developers can easily override these defaults if needed.

Auto-configuration: Spring Boot includes a powerful auto-configuration feature that automatically configures various application components based on the dependencies on the classpath. This feature saves developers a lot of time and effort, as they don't have to configure each application component manually.

Dependency Injection: Spring Boot uses dependency injection to manage the dependencies between various application components. This makes it easy to test and maintain the application and improves its scalability.

Spring Ecosystem: Spring Boot is built on top of the Spring framework, which provides a large and active ecosystem of libraries, tools, and resources. This ecosystem includes libraries for database access, messaging systems, security, and more.

Production-ready: Spring Boot includes many features that make it easy to deploy and run applications in production environments. These features include built-in monitoring, metrics, and health checks.

Overall, Spring Boot provides many benefits for developers, including faster development, easier maintenance, and improved scalability. Its rich ecosystem of libraries and tools, combined with its focus on microservices-based architectures, makes it a popular choice for building web applications.

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The Architecture of Spring Boot

Spring Boot follows a layered architecture, which is composed of the following layers:

Presentation Layer: This layer handles user requests and generates responses.

Service Layer: This layer contains business logic and is responsible for processing user requests.

Persistence Layer: This layer is responsible for storing and retrieving data from a database.

Infrastructure Layer: This layer contains code used across all layers, such as configuration and utility classes.

What Are the Key Features of Spring Boot Framework?

Every framework possesses several features and functionaries that set them apart from other frameworks. Similarly, Spring Boot is no ordinary tool; it offers many key features that make it one of the most choiceable weapons for creating spring applications easily and fast. Spring Boot is a popular framework for building enterprise-level applications in Java. It provides a range of powerful features, such as auto-configuration, embedded servers, and a comprehensive set of libraries that make integrating with other tools and technologies easy.

Spring Boot also supports a range of deployment options, including traditional deployment to standalone servers or containers and cloud-native deployment to platforms such as Kubernetes. Overall, Spring Boot provides developers a powerful and flexible platform for building scalable, high-quality applications. Here are the top-notch features that the Spring Boot framework offers to developers:

  1. Spring Application
  2. Externalized Configuration
  3. Profiles
  4. Spring Initializr
  5. Opinionated Configuration
  6. Spring Security
  7. Testing
  8. Spring Integration
  9. Standalone Application
  10. Logging

If you want to learn more about these features in-depth, check out our dedicated Spring Boot features guide.

Special Key Advantages of Spring Boot

Being a production-ready ecosystem, Spring Boot delivers a faster development environment for developers that helps them build fast, secure, and responsive web applications. It has the ultimate flexibility to create an app that can run on any Java platform without any extra implementations. Its spontaneous advantages make it a preferable choice for app development. Spring Boot offers a lot of reasons for developers to choose it. The following list describes some of the top advantages of using Spring Boot.

Spring Boot works with several servlet containers

Spring Boot is well-optimized and easily works with the most popular embedded servlet containers. Spring boot has its default servlet container called Tomcat, but you can swap its default container with other more proficient servlet containers such as Jetty, Undertow, Resin, and Wildfly. It increases your choice options as you can choose options that improve the specific types of functionality that concern you most.

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Additionally, Spring Boot automatically detects the servlet you set as the new default during the Spring Boot sequence. This advantage gives developers the flexibility to choose embedded servers that suit them the most.

Bootstrapping reduces memory space

As you know, Spring Boot uses a Boot initializer to compile the source language. This bootstrapping technique allows users to save space on their mobile devices and load applications much faster without any complications.

Decreased boilerplate code

Spring Boot's in-memory database and embedded server eliminate the boilerplate code typically needed to set up an application. Without boilerplate codes, developers can reduce their development time and update cycles, leading to more satisfied users and productive employees. It's another great advantage of Spring Boot that helps developers save development time.

No XML configuration required

For Spring project development, developers can use annotations or XML configuration. This option eliminates XML configurations, saving developers extra time as they don't need to go through the extra steps required.

WAR files are not required

Spring Boot can use WAR (web application resources) files; however, they are unnecessary. Instead, Spring Boot can rely on JAR (Java resources).

Java has a shorter, simpler structure that makes them useful for developers and users. The lightweight JAR files are easy to connect applications with the tools they need to function. Choosing WAR and JAR files is very beneficial for development teams. So developers who don't have experience in JAR files can work with WAR as an alternate option.

POM dependency management

Spring Boot doesn't require you to use parent POM (Project object model). Adding the Spring Boot dependencies artifact lets you manage dependencies without relying on the POM or XML.

A large community of helpful users

Spring Boot is a popular tool worldwide with an extensive large user base that uses it as a primary development tool. Spring Boot is no hard task, and any developer can learn it easily. Additionally, Spring Boot is an open-source platform containing large community support to help new developers who want to learn the framework straightforwardly.

A developer can easily find all the tools, tutorials, and discussions online; they need to build applications with Java Spring Boot effectively. Another advantage of having such a large community of users is that you can often find existing code very similar to what you want to build.

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Instead of starting from scratch, you can access and adjust the code to meet your needs. If you want to start a Spring Boot project then GitHub's Spring Boot page is always a good place to do that.

The Difference Between Spring and Spring Boot

As mentioned earlier, Spring is an open-source, Java-based app framework that covers many smaller projects under its umbrella. Other Spring projects include Spring Data, Spring Cloud, and Spring Security. To understand the difference between Spring and Spring Boot, it's important that even though there is a difference in both core capabilities, it's all in the spring family.

To understand the difference between Spring and Spring Boot, we'll have to define some key terms first.

What are microservices?

Microservices is an architectural approach in which software comprises small independent and deployable services. Microservices architecture makes applications much easier to scale and faster to develop, enabling innovation and accelerating updating timely. And on top of that, microservices are distributed and loosely coupled so that if one team changes or breaks, the code won't affect the whole application function.

What is dependency injection?

Dependency injection provides the objects that are needed instead of creating an object (its dependencies). This is a very useful technique for testing, as it allows dependencies to be mocked or excluded.

Dependencies can be injected into objects in several ways (such as constructor or setter injection). One could use specialized dependency injection frameworks (such as Spring) to do this, but they are certainly not required. Moreover, you don't need any of those frameworks to have dependency injection. Instantiating and passing objects (dependencies) explicitly is as good as injecting them by the framework itself.

What is convention over configuration?

Convention over configuration is a software development approach aligned towards developing applications according to typical programming conventions versus programmer-defined configurations. It enables an effective and simple application development environment while maintaining base software requirements. Convention over configuration also goes by another name “coding by convention”.

Now that you have understood the key terms of Spring and Spring Boot let's define the difference between them.

Spring Framework vs. Spring Boot

Spring Framework

Spring is a comprehensive framework that provides various modules for creating applications. It offers various features for developing web applications, RESTful APIs, microservices, messaging, and data access. It provides a lot of flexibility and customization options for developers, but it requires a considerable amount of configuration and setup to get started.

Spring Boot

On the other hand, Spring Boot is an opinion-oriented extension built on the Spring framework that helps develop applications much faster and more efficiently. Spring Boot allows you to create standalone spring applications that can just run without the need for annotations, XML configurations, or writing a lot of codes.

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There is no such big difference between Spring framework and Spring Boot as they both are in the Spring family.

What Does Spring Boot Add to Spring Framework?

Spring Boot has three core capabilities that make it a more profound platform for creating applications.


Spring Boot has autoconfiguration functionalities that enable an auto-configuration system. Autoconfiguration is a way for programs to be set up without you having to set everything up yourself.

Java Spring Boot has a built-in feature for autoconfiguration, which sets up the basic setup of the Spring Framework and other packages based on what you want to do (and based on what is best practice to avoid mistakes).

You can change these settings if you want to, but the autoconfiguration feature helps you start developing your Spring-based applications quickly and reduces the risk of making mistakes.

An opinionated approach to configuration

Spring Boot uses an opinionated approach to adding and configuring starter dependencies based on the needs of your application. Spring Boot can choose which packages to install and which default value to use, frees you from making all these decisions, and sets up everything manually.

You can define the requirements of your Spring project in time of the initialization process, during which you choose among multiple starter dependencies—called spring starters—that cover typical use cases in the opinionated approach to configuration. You can run Spring Boot initializr by completing a simple web form without coding. Spring Boot includes over 50 spring starters and many third-party starter packages.

The ability to create standalone applications

This is one of the reasons why Spring Boot is popular among developers. It helps developers create a standalone application that runs on its own. It doesn’t rely on an external web server by embedding a web server such as Tomcat into your app during the initialization process. As a result, you can deploy and launch your applications on any platform by hitting on a Run command. You can opt out of this feature to build an application embedded with a web server.

Getting Started with Spring Boot

To get started with Spring Boot, you need to have Java installed on your system. After Java is installed, you can download and install Spring Boot from the official website.

Once Spring Boot is installed, you can start building your web application. Spring Boot provides several starter projects that can be used to set up a new project quickly.

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This way, you can start your journey to develop fast and production-grade applications.


Through this Spring Boot framework guide by Orion InfoSolutions, you have learned what Spring Boot is in Java and how it is beneficial for developers. When building an application that can run on any platform, many Java developers prefer Spring Boot. Spring Boot is a highly effective tool for rapidly creating any Java-based solutions requiring fewer configurations. The main goal of Spring Boot is to reduce the development time and increase efficiency by having a default setup for unit and integration tests.

If you’re considering building an application, be it a web or mobile app. Still you don’t know where to start, you should approach a professional Spring Boot developer for help. Or look for a dedicated Spring Boot development company with expertise in their development package. This way, you can develop your Spring application more efficiently.

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About Author

DC Kumawat

DC Kumawat is the CEO of Orion InfoSolutions, a leading provider of IT solutions to businesses of all sizes. He has over 14+ years of experience in the IT industry. He is a passionate advocate for the use of technology to improve business performance.