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public interface ApplicationContext<T extends Config> {
  T getConfig();
}

public interface Application<T extends Config> {
  void configure(ApplicationConfigurer configurer, ApplicationContext<T> context);
}
 
public abstract class AbstractApplication<T> implements Application<T extends Config> {
  ...
  protected final ApplicationContext<T> getContext() { return context; }
}
 
public class MyApp extends AbstractApplication<MyApp.MyConfig> {
 
  public static class MyConfig extends Config {
    @Nullable
    private String stream;
 
    @Nullable
    private String table;
    private MyFlowConfig flowOptions;
 
    private MyConfig() {
      this.stream = "A";
      this.table = "X";
    }
  }
 
  public void configure() {
    // ApplicationContext now has a method to get a custom config object whose fields will
    // be injected using the values given in the RESTful API
    MyConfig config = getContext().getConfig();
    addStream(new Stream(config.stream));
    createDataset(config.table, Table.class);
    addFlow(new MyFlow(config.stream, config.table, config.flowOptions));
  }
}