What is relaxed binding in Spring boot?

Relaxed binding maps the Environment property to the bean property name even it is not an exact match. For example, dash-separated environment properties (app-name bound to appName) or capitalized properties as in PORT (bound to port).

Spring boot supports relaxed binding.

@Component
@ConfigurationProperties(prefix = "host")

public class ApplicationProperties {

    private String Name;
    private String PORT;
    private String app_name;

    @Override
    public String toString() {
        return "ApplicationProperties{" +
                "Name='" + Name + '\'' +
                ", PORT='" + PORT + '\'' +
                ", app_name='" + app_name + '\'' +
                '}';
    }

...
}

application.properties.

host.name=javapedia.net
host.port=80
host.appName=JAVAPEDIA

In the above example, although the "host" bean property and configuration property name mismatch(appName vs app_name), the value is bound. For the complete example, take a look here.

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