Immutable @ConfigurationProperties

Question

Is it possible to have immutable (final) fields with Spring Boot\'s @ConfigurationProperties annotation? Example below

@ConfigurationProperties(         


        

Answer 1

You can set the field values through @Value annotations. These can be placed directly on the fields and don't require any setters:

@Component
public final class MyProps {

  @Value("${example.neededProperty}")
  private final String neededProperty;

  public String getNeededProperty() { .. }
}

The downside of this approach is:

• You'll need to specified the fully-qualified property name on each field.
• Validation doesn't work (cf. this question)