spring framework 101

Spring 101A 30 Minute Review by Matthew McCullough

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

• Java Application Framework (Not JEE)

• Targets Web, Enterprise Applications

• POJO Centric

• Inversion of Control (IOC)

• Now called Dependency Injection (DI)

❷ Modularized

Alphabet Soup

• JDBC Wrapper

• JDO, iBatis, Hibernate, JPA helper

• Supplement to Struts, Tapestry

• Batch Processing Framework

• Timed Events

• JMS, JNDI, LDAP

❸ IOC/DIDon’t call me, I’ll call you

• Core Spring capabilities

• Configure components from outside-in

• Counter to the usual constructor calling out to everything it needs

• DI/IOC can be used in three ways

• POJO Setters

• Constructors

• Service lookup (JNDI)

Split Personalities

❹ Factory

But not the kind that Al Gore worries about

• POJO Centric

• BeanFactory creates beans

• Gives toggle choice between singleton and instances

• Creates PROPER singletons

• Auto-wiring by name

❺ Aspects

• Supplement existing methods on the fly

• Terminology: Proxies, Weaving, AspectJ

• Weaving:

• Byte time

• Load time