How can a custom class be configured with a Spring @Value property?

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To configure a custom class with a Spring @Value property, you need to follow the below steps:

1. Create a custom class with instance variables for the values you want to set via @Value annotation:

public class CustomClass {
    private String endpointUrl;
    private String apiKey;

    // constructor and getters/setters
}

1. In your Spring configuration class, create an instance of the custom class and annotate it with @Component:

@Component
public class MyConfig {

    @Value("${api.endpoint}")
    private String endpointUrl;

    @Value("${api.key}")
    private String apiKey;

    @Bean
    public CustomClass customClass() {
        return new CustomClass(endpointUrl, apiKey);
    }

}

1. Use the created bean in your application:

@Autowired
private CustomClass customClass;

// use customClass instance variables as required

In the example above, we used @Value to load the values for endpointUrl and apiKey from properties files. You can also use other sources such as system properties or environment variables.