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Spring is well-organized architecture consisting  of seven modules. Modules in the Spring framework are:

Spring AOP

One of the key components of Spring is the AOP framework. AOP is used in Spring:

  • To provide computing enterprise services, especially as a replacement for EJB services. The most important such service is computing transaction management, which builds on Spring’s transaction abstraction.
  • To allow users to implement custom aspects, complementing their use of OOP with AOP


Spring ORM

The ORM package is related to the database access. It provides integration layers for popular object-relational mapping APIs, including JDO, Hibernate and iBatis.


Spring Web

The Spring Web module is part of Spring web application development stack, which includes Spring MVC.


Spring DAO

The DAO (Data Access Object) support in Spring is primarily for standardizing the data access work using the technologies like JDBC, Hibernate or JDO.


Spring Context

This package builds on the beans package to add support for message sources and for the Observer design pattern, and the ability for application objects to obtain resources using a consistent API.


Spring Web MVC

This is the Module which provides the MVC implementations for the web applications.


Spring Core

The Core package is the most import component of the Spring Framework.
This component provides the Dependency Injection features. The BeanFactory  provides a factory pattern which separates the dependencies like initialization, creation and access of the objects from your actual program logic.