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public class InvalidConfigurationException extends RuntimeException {
  // payload gets returned in the http response.
  private final String payload;
  public InvalidConfigurationException(String message) {
    this(message, null);
  }
  public InvalidConfigurationException(String message, @Nullable String payload) {
    super(message);
    this.payload = payload;
  }
}
 
public interface Application<T extends Config> {
  /**
   * Configures the Application.
   *
   * @param configurer Collects the Application configuration
   * @param context Used to access the environment, application configuration, and application (deployment) arguments
   * @throws InvalidConfigurationException if the config is invalid
   */
  void configure(ApplicationConfigurer configurer, ApplicationContext<T> context);
}

PUT /apps/{app-name} -H 'Content-Type: application/json' -d '{
  "artifact": { ... },
  "config": { ... },
  "dryrun": true
}'
 
{
  "message": "....",
  "payload": "..."
}