Spring Frame Work Overview

Spring Frame Work Overview (1.x)

Spring Frame Work Overview (2.x)

Spring DAO:

Provides abstraction layer on JDBC to develope persistence logic.

Spring ORM:

Provides abstraction layer on ORM Frameworks like Hibernate, toplink and etc.. to develop OR mapping persistence logic.

Spring Web:

(a) provides plugins for structs + spring, jsf+spring integration.

(b) provides spring web mvc as web f/w to develop web applications.

Spring JEE:

Provides abstraction layer on multiple java JEE Technologies like JNDI, JMS,RMI,JTA and etc.. to develop JEE applications.

Spring AOP:

Providing a different mechanism or methodology to develop and apply middleware services like logging, security, Transaction and etc..

Note:

Middleware configurations means  

Spring 3.x Overview Diagram

Servlet container and EJB Container are Heavy weight but where as Spring is Light weight (Ram level)