Rod.Johnson, the author of spring framework. In 2002, he said in a book Expert one to one J2EE design and development that the J2EE system is too complex,so he wanted to make a change.
At first, he write the framework ‘interface21‘. Spring was based on it and redesigned. Then, in 2004 spring‘s v1.0 was published. Rod also write a book Expert one to one J2EE Development without EJB.
1. Brief Introduction
spring is light, all spring package can be in a jar of 1M.
spring is non-invasive, business object don‘t need depend on spring classes.