Spring framework

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 Injection
• Constructor Injection
• Method Injection