Question

我想知道。我可以这样做或推导它吗？在我的Dropwizard config.yml中，我想扩展databaseConfiguration类，以便将另一个属性添加到config.yml，如下所示

config.yml

database
  driverClass: org.postgresql.Driver
  user: user1
  password: password
  exampleProperty: property1 (Tried a few other permutations)

假设有一个DatabaseConfiguration类，其中包含有关于driverClass，user，password等的getter和注释的字段

public class AppConfiguration extends Configuration {
  @Valid
  @NotNull
  @JsonProperty
  private DatabaseConfiguration database = new DatabaseConfiguration();

  public DatabaseConfiguration getDatabaseConfiguration() {
    return database;
  }

  @Valid
  @NotNull
  @JsonProperty
  private ExtendedDatabaseConfiguration extDatabase;
  public ExtendedDatabaseConfiguration getExtendedDatabaseConfiguration() {
     return extDatabase;
  }

  public class ExtendedDatabaseConfiguration extends DatabaseConfiguration {
  @Valid
  @NotNull
  @JsonProperty
  private String exampleProperty;
  public String getExampleProperty() { return exampleProperty; };
  }

主类Server.java通过调用将ExtendedDatabaseConfiguration传递给Hibernate Bundle（以前通过了DatabaseConfiguration）

    private final CustomHibernateBundle<AppConfiguration> hibernateBundle = new CustomHibernateBundle<AppConfiguration>() {
    @Override
    //Giving the subclass holding the new database property to the CustomHibernateBundle
    public DatabaseConfiguration getDatabaseConfiguration(AppConfiguration configuration) {
        return configuration.getExtendedDatabaseConfiguration();
    }
};
    SimpleModule simpleModule = new SimpleModule();
    simpleModule.addAbstractTypeMapping(DatabaseConfiguration.class, ExtendedDatabaseConfiguration.class);
    bootstrap.getObjectMapperFactory().registerModule(simpleModule);

这是为了让CustomHibernateBundle随时使用这个字段。

无论我尝试了什么，我得到错误jackson.databind.exc.UnrecognizedPropertyException或我得到以下

Exception in thread "main" com.yammer.dropwizard.config.ConfigurationException: powaaim.yml has the     following errors:
* extDatabase may not be null (was null)
* exampleProperty may not be null (was null)

请注意。我无权修改DatabaseConfiguration但我可以扩展它。想知道是否可以实现这一点，以便我可以通过这种方法定义更多的数据库配置属性。

或者只是一种更简单的方式？

Answer 1

您应该能够扩展DatabaseConfiguration - 我认为您刚刚添加了解析器现在所期望的额外配置字段（尽管我不确定丢失的key的警告来自何处）。请尝试以下配置类：

public class AppConfiguration extends Configuration {
  @Valid
  @NotNull
  @JsonProperty
  private ExtendedDatabaseConfiguration database = new ExtendedDatabaseConfiguration();

  public ExtendedDatabaseConfiguration getDatabaseConfiguration() {
    return database;
  }

  static class ExtendedDatabaseConfiguration extends DatabaseConfiguration {
    @Valid
    @NotNull
    @JsonProperty
    private String exampleProperty;
    public String getExampleProperty() { return exampleProperty; };
  }
}

在Dropwizard yaml中找不到DatabaseConfiguration子类中的属性（层次结构问题）

1 个答案: