@Value & @PropertySource & Environment Key-Values | Dependency Injection | Spring Tutorial |Ch1|E20|

in this session we learn about the duties of Environment abstraction in spring application context, and that is providing key values from multiple property sources like operating system environment variables, JVM runtime variables and other custom property sources that could be added by @PropertySource annotation or manually and problematically by implementing PropertySource interface. you could access the values for given keys by @Value annotation