Core Container

1. Core: IoC (Inversion of Control) and Dependency Injection

2. Bean: BeanFactory

3. Context: A medium to access any defined and configured object

4. Spring Expression Languages (SpEL): Querying and manipulating an object graph at runtime

Data Access/Integration

1. JDBC: eliminating boilplate code required for Java JDBC

2. ORM: Code portability regardless of data access technologies

3. OXM: Conversion between objects and XML

4. JMS: Enhanced Java Messaging Service

5. Transaction: Transaction management

Web

1. Web: Servlet listeners, web applicatin context

2. Web-Servlet: MVC based web application

3. Web-Socket: Two-way communication between client and server web applications

4. Web-Portlet: MVC-Portlet

AOP: Address cross-cutting concerns

Instrumentation: Class instrumentation support and class loader implementations

Test: JUnit or TestNG support