Spring is a Java application framework that targets web and enterprise applications. It uses inversion of control (IOC), also known as dependency injection (DI), to configure application components. Spring provides modular frameworks for JDBC, Hibernate, JPA, Struts, Tapestry, batch processing, timed events, JMS, JNDI, and LDAP. The core capabilities of Spring include IOC/DI, which configures components from outside-in rather than constructor calling. DI/IOC can be used through POJO setters, constructors, or service lookup. Spring uses a BeanFactory to create beans as singletons or instances and allows auto-wiring by name. Aspects in Spring supplement existing methods dynamically

1. Spring 101
A 30 Minute Review by Matthew McCullough

2. ❶ What Is Spring?
Don’t call me, I’ll call you

3. • Java Application Framework (Not JEE)
• Targets Web, Enterprise Applications
• POJO Centric
• Inversion of Control (IOC)
• Now called Dependency Injection (DI)

4. ❷ Modularized
Alphabet Soup

5. • JDBC Wrapper
• JDO, iBatis, Hibernate, JPA helper
• Supplement to Struts, Tapestry
• Batch Processing Framework
• Timed Events
• JMS, JNDI, LDAP

6. ❸ IOC/DI
Don’t call me, I’ll call you

7. • Core Spring capabilities
• Configure components from outside-in
• Counter to the usual constructor calling
out to everything it needs

8. Split Personalities
• DI/IOC can be used in three ways
• POJO Setters
• Constructors
• Service lookup (JNDI)

9. ❹ Factory
But not the kind that Al Gore worries about

10. • POJO Centric
• BeanFactory creates beans
• Gives toggle choice between singleton
and instances
• Creates PROPER singletons
• Auto-wiring by name

11. ❺ Aspects

12. • Supplement existing methods on the fly
• Terminology: Proxies, Weaving, AspectJ
• Weaving:
• Byte time
• Load time