These projects are versioned differently from the Spring Framework. For example, the current version of the Spring Framework is 5.x.x and that of Spring Boot (one of the Spring Projects) is 2.x.x.

Spring Boot

Spring Boot is one of the most popular frameworks for developing microservices today. Spring Boot makes it easy to develop applications quickly. It has important features such as starter projects, auto-configuration, and actuator; it is a cakewalk to develop microservices.

Spring Cloud

The world is moving more and more towards the cloud. Everyone wants to deploy their application in the cloud. If you develop a microservice using Spring Boot, you could use Spring Cloud to make it cloud-enabled.

Spring Data

Spring Data provides mechanisms for consistent data access.

A few years earlier, there was only one kind of database that an application could connect to — the SQL-based relational databases. Today, we also have at our disposal a wide variety of databases including the NoSQL databases.

Spring Data ensures that the way we access data from all these sources remains consistent.

Spring Integration

Spring Integration, on the other hand, addresses the issues of application integration.

Spring Integration provides implementations for recommended architecture patterns in Enterprise Application Integration.

Spring Batch

Not all processing is done online, and a lot is also accomplished through batch applications.

Batch applications have their own unique set of requirements. For instance, it is important to be able to restart a batch job from the point where it had failed earlier. It may also be necessary to track down accurately what is happening in the background when a batch job executes.

Spring Batch provides a great option to develop batch applications.

Spring Security

Security is one of the most important non-functional requirements of an application’s development. Any application that you develop, be it a web application, a REST service, or any other, you want it to be secure.

Spring Security provides features for securing the applications that you develop. It has support for basic authentication, OAuth1, and OAuth2 authentication.

Spring HATEOAS

With RESTful services, it is not sufficient if you simply return the data for a resource. It is also recommended to return related actions you can perform on the resource. This is called HATEOAS. Spring HATEOAS enables you to develop HATEOAS compatible REST API.