Multiple string values from application.yaml file

@ConfigurationProperties is a Spring annotation used to bind external configuration properties (like those from .properties or .yaml files) to Java objects in a type-safe manner. This feature is commonly used in Spring Boot applications to manage application-specific settings in a structured way.

Defining a Configuration Class

Use @ConfigurationProperties to specify the prefix of the properties to bind.

application.yml

myapp:
  events:
    - approved
    - rejected
    - inprocess

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
@ConfigurationProperties(prefix = "myapp")
public class EventsConfig {

    private List<String> events; // We can also use String[] events;

    public List<String> getEvents() {
        return events;
    }

    public void setEvents(List<String> events) {
        this.events = events;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MyEventsService {

    private final EventsConfig eventsConfig;

    @Autowired
    public MyService(EventsConfig eventsConfig) {
        this.eventsConfig = eventsConfig;
    }

    public boolean hasEvents(String input) {
        return eventsConfig.getEvents().contains(input);
    }
}