Spring is an open-source lightweight framework that allows Java EE 7 developers to build simple, reliable, and scalable enterprise applications. This framework mainly focuses on providing various ways to help you manage your business objects. It made the development of Web applications much easier compared to classic Java frameworks and Application Programming Interfaces (APIs), such as Java database connectivity (JDBC), JavaServer Pages (JSP), and Java Servlet. This framework uses various new techniques such as Aspect-Oriented Programming (AOP), Plain Old Java Object (POJO), and dependency injection (DI), to develop enterprise applications. The Spring framework can be considered as a collection of sub-frameworks, also called layers, such as Spring AOP. Spring Object-Relational Mapping (Spring ORM). Spring Web Flow, and Spring Web MVC. You can use any of these modules separately while constructing a Web application. The modules may also be grouped to provide better functionalities in a Web application.
Spring Boot is built on top of the conventional spring framework. So, it provides all the features of spring and is easier to use than spring. Spring Boot is a microservice-based framework and makes a production-ready application in very less time. In Spring Boot everything is auto configured. We just need to use proper configuration for utilizing a particular functionality. Spring Boot is very useful if we want to develop REST API.
Why Spring Boot over Spring?
Let us know, if Spring was solving all the problems, then what is the need for Spring Boot at all?
The reason why we need Spring Boot is we are changing or shifting towards applications like microservices and with microservices, one of the most important thing aim is we would want to be able to develop applications very quickly. So instead of building one large application, we would like to build ten small microservices, which have their own scope and their own capabilities. Spring-based applications have lots of configurations. It can be of XML configuration, Java configuration or annotations, etc. For example, If we want to use Spring MVC, we need to use @ComponentScan annotation, Dispatcher servlet, view resolver, web jars, etc. This kind of configuration makes it slow to develop an application. So, in this place, Spring Boot Autoconfiguration comes in. It looks at what types of frameworks are available at the classpath and it looks at what configurations are provided by the programmers or what configurations are provided already for the application. It will look at both of them. Data is not configured but there is hibernation on the classpath, so it will configure the data source automatically. It will configure the in-memory database, it will configure the dispatcher servlet automatically. This is called autoconfiguration. Spring Boot creates a starter project by which all the XML configurations and dependencies get by default.
Difference between Spring and Spring Boot
Spring is an open-source lightweight framework widely used to develop enterprise applications.
Spring Boot is built on top of the conventional spring framework, widely used to develop REST APIs.
The most important feature of the Spring Framework is dependency injection.
The most important feature of the Spring Boot is Autoconfiguration.
It helps to create a loosely coupled application.
It helps to create a stand-alone application.
To run the Spring application, we need to set the server explicitly.
Spring Boot provides embedded servers such as Tomcat and Jetty etc.
To run the Spring application, a deployment descriptor is required.
There is no requirement for a deployment descriptor.
To create a Spring application, the developers write lots of code.
It reduces the lines of code.
It doesn’t provide support for the in-memory database.
It provides support for the in-memory database such as H2.
Developers need to write boilerplate code for smaller tasks.
In Spring Boot, there is reduction in boilerplate code.
Developers have to define dependencies manually in the pom.xml file.
pom.xml file internally handles the required dependencies.
Basically, there is no such comparison between Spring and Spring Boot, they solve their own problems. The comparison does not really matter because Spring solves it’s own problems of dependency injection and Spring Boot solves the problem of getting applications like Rapid development. At last, they have their own problem spaces.
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