Spring Values:
Spring is a non-invasive framework. Spring Application code can be run without Spring. Lock-in to Spring minimized. Migration to higher Spring is easier.Aims to facilitate good programming practice, such as programming to interfaces, rather than classes.Spring promotes pluggability. Think of application objects as named services. Spring facilitates the extraction of configuration values from java code into XML or properties files.Inversion of Control and Dependency Injection
"Hollywood principle" ----- Don't call me , I'll call you. Instead of Application call framework's API, framework's API invoke appliction code. Dependency Injection objects never load custom properties or go to database to load configuration -- the framework is whooly responsible for actually reading configuration.
Types of Dependency Injection:
Setter InjectionConstructor InjectionMethod Injection