Spring framework architecture Diagram:

1. Test:
Spring test module provides the supports for testing of spring components with JUnit or TestNG frameworks.

2. Core Container:
Spring core container contains the following:
a. Core: Core module provides the fundamental features of spring framework like IoC and DI.
b. Bean: Bean module provides the BeanFactory.
c. Context: Context module provides a way to access any object. ApplicationContext                         interface is the main part of Context module.
         This module supports internationalization (I18N), EJB, JMS, Basic Remoting.
d. Expression language: Expression language module provides a way to manipulate objects at runtime.  It is an extension to the EL defined in JSP. It provides support to setting and getting property values, method invocation, accessing collections and indexers, named variables, logical and arithmetic operators, retrieval of objects by name etc.

3. Data Access/Integration contains the following:

a. JDBC: JDBC modules provides a JDBC-abstraction layer.
b. ORM: ORM provides integration layers for object-relational mapping APIs like JPA, and          Hibernate etc.
c. OXM: OXM module provides an abstraction layer for Object/XML mapping APIs like                 JAXB, Castor and XMLBeans etc.
d. JMS: JMS module provides feature of message processing.
e. Transaction: Transaction module provides the facility of transaction management for classes like POJOs etc.

4. Web:
Web module consist of Web, Web-Servlet, Web-Struts, Web-Socket and Web-Portlet which provides the facility of creating web applications.

5. AOP:
AOP module provides aspect-oriented programming implementation which provides the facility to define method-interceptors.

6. Instrumentation:
Instrumentation module provides class instrumentation support and class loader implementations