Spring modules

Spring Framework has several distinct modules for a specific set of functionalities, and they work more or less independently of the others. This system is very flexible, so the developer can choose only those required for the enterprise application. For example, a developer can just use the Spring DI module and build the rest of the application with non-Spring components. So, Spring provides integration points to work with other frameworks and APIs--for example, you can use the Spring Core DI pattern only with the Struts application. In case the development team is more proficient in using Struts, it can be used instead of Spring MVC while the rest of the application uses Spring components and features, such as JDBC and transactions. So while the developers need to deploy the required dependencies with the Struts application, there is no need to add a whole Spring Framework.

Here is an overview of the entire module structure:

Let's look at each of Spring's modules and see how each fits in to the bigger picture.