Using immutables for Dropwizard configuration

Example.java

public class Example implements Application<ExampleConfigWrapper> {
  public static void main(String[] args) throws Exception {
    new Example().run(args);
  }
  @Override public void run(Configuration conf, Environment env) {
    // do stuff
  }
}

class ExampleConfigWrapper extends Configuration {
  @JsonUnwrapped public ExampleConfig config;
}

@Immutable
@JsonDeserialize(as = ImmutableExampleConfig.class)
interface ExampleConfig {
  int foo();
  String bar();
}