How does Spring get property values from configuration sources?

Spring retrieves property values from various configuration sources using the PropertySources mechanism. By default, Spring Boot loads properties from application.properties or application.yml files, as well as from environment variables and system properties. These sources are combined into a chain, where values from higher-priority sources override those from lower-priority ones. To access property values, the @Value annotation or the ConfigurationProperties bean is used.

Example of using @Value:

@Value("${my.property.name}")
private String myProperty;

Thus, Spring abstracts the configuration source and allows convenient management of application settings.