The Spring Framework is divided into modules. Applications can choose which modules they need. At the heart are the modules of the core container, including a configuration model and a dependency injection mechanism. Beyond that, the Spring Framework provides foundational support for different application architectures, including messaging, transactional data and persistence, and web. It also includes the Servlet-based Spring MVC web framework and, in parallel, the Spring WebFlux reactive web framework.
Everything in Spring is based on business interfaces. The code asks for an instance of an implementer of an interface, and then calls methods just as it would call another class. The inversion of control container wires everything together based on some simple instructions. This makes it easy to access collaborators. It also allows developers to run integration tests on components by booting a Spring container or test components in isolation using unit tests, stubs and mocks.Everything we’re talking about here has been provided by the Spring framework for close to a decade. And it doesn’t require any special application server to run; Spring’s container can run inside of any Java runtime.
Although the Java platform provides a wealth of application development functionality, it lacks the means to organize the basic building blocks into a coherent whole, leaving that task to architects and developers. We can use design patterns such as Factory, Abstract Factory, Builder, Decorator, and Service Locator to compose the various classes and object instances that make up an application. However, these patterns are simply best practices, with a description of what the pattern does, where to apply it, the problems it addresses, and so forth. Patterns are formalized best practices that you must implement yourself in your application. The Spring Framework Inversion of Control (IoC) component addresses this concern by providing a formalized means of composing disparate components into a fully working application ready for use. The Spring Framework codifies formalized design patterns as first-class objects that you can integrate into your own application(s). Numerous organizations and institutions use the Spring Framework in this manner to engineer robust, maintainable applications.
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