Simple Field Injection w/ @value

AppConfig.java

@Configuration
public class AppConfig {
    // Using SpEL
    @Value("#{providerInfo.name ?: 'bar'}")
    private String providerName;
    // Injecting a Duration w/ a default
    @Value("${timeout:500ms}")
    private Duration timeout;
}

application.properties

provider.name=foo
timeout=1000ms

ProviderInfo.java

@Component
public class ProviderInfo {
    @Value("${provider.name}")
    private String name;
}