Spring Framework is a Java platform that provides comprehensive infrastructure support for developing Java applications. Spring handles the infrastructure so you can focus on your application.
Spring enables you to build applications from “plain old Java objects” (POJOs) and to apply enterprise services non-invasively to POJOs. This capability applies to the Java SE programming model and to full and partial Java EE.
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Examples of how you, as an application developer, can use the Spring platform advantage:
Make a Java method execute in a database transaction without having to deal with transaction APIs.
Make a local Java method a remote procedure without having to deal with remote APIs.
Make a local Java method a management operation without having to deal with JMX APIs.
Make a local Java method a message handler without having to deal with JMS APIs.
Spring could potentially be a one-stop-shop for all your enterprise applications. However, Spring is modular, allowing you to pick and choose which modules are applicable to you, without having to bring in the rest. The following section provides details about all the modules available in Spring Framework.
The Spring Framework provides about 20 modules which can be used based on an application requirement.
The Core Container consists of the Core, Beans, Context, and Expression Language modules the details of which are as follows −
The Core module provides the fundamental parts of the framework, including the IoC and Dependency Injection features.
The Bean module provides BeanFactory, which is a sophisticated implementation of the factory pattern.
The Context module builds on the solid base provided by the Core and Beans modules and it is a medium to access any objects defined and configured. The ApplicationContext interface is the focal point of the Context module.
The SpEL module provides a powerful expression language for querying and manipulating an object graph at runtime.
The Data Access/Integration layer consists of the JDBC, ORM, OXM, JMS and Transaction modules whose detail is as follows −
The JDBC module provides a JDBC-abstraction layer that removes the need for tedious JDBC related coding.
The ORM module provides integration layers for popular object-relational mapping APIs, including JPA, JDO, Hibernate, and iBatis.
The OXM module provides an abstraction layer that supports Object/XML mapping implementations for JAXB, Castor, XMLBeans, JiBX and XStream.
The Java Messaging Service JMS module contains features for producing and consuming messages.
The Transaction module supports programmatic and declarative transaction management for classes that implement special interfaces and for all your POJOs.
The Web layer consists of the Web, Web-MVC, Web-Socket, and Web-Portlet modules the details of which are as follows −
The Web module provides basic web-oriented integration features such as multipart file-upload functionality and the initialization of the IoC container using servlet listeners and a web-oriented application context.
The Web-MVC module contains Spring's Model-View-Controller (MVC) implementation for web applications.
The Web-Socket module provides support for WebSocket-based, two-way communication between the client and the server in web applications.
The Web-Portlet module provides the MVC implementation to be used in a portlet environment and mirrors the functionality of Web-Servlet module. For more Additional info at Spring Boot Training
There are few other important modules like AOP, Aspects, Instrumentation, Web and Test modules the details of which are as follows −
The AOP module provides an aspect-oriented programming implementation allowing you to define method-interceptors and pointcuts to cleanly decouple code that implements functionality that should be separated.
The Aspects module provides integration with AspectJ, which is again a powerful and mature AOP framework.
The Instrumentation module provides class instrumentation support and classloader implementations to be used in certain application servers.
The Messaging module provides support for STOMP as the WebSocket sub-protocol to use in applications. It also supports an annotation programming model for routing and processing STOMP messages from WebSocket clients.
The Test module supports the testing of Spring components with JUnit or TestNG frameworks.
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