configuration.yml出现错误：* driverClass-DROPWIZARD中的无法识别的字段

Question

I'm getting the following error when launching a Dropwizard application that uses a database connection to MySQL:

configuration.yml has an error:
* Unrecognized field at: driverClass
Did you mean?:
  - database
  - server
  - metrics
  - logging

Configuration.yml:

server:
  applicationConnectors:
    - type: http 
    port: 9010
  adminConnectors:
    - type: http
    port: 9011
  database:
    driverClass: com.mysql.jdbc.Driver
    user: ppub_web
    password: password
    url: jdbc:mysql://url:to connect port

Configuration class:

public class ConfigurationClass extends Configuration{

@Valid
@NotNull    
@JsonProperty("database")
private DataSourceFactory datasourceFactory = new DataSourceFactory();

public DataSourceFactory getDataSourceFactory() {
        return datasourceFactory;
    }
}

Answer 1

• Make sure that you class DataSourceFactory contains a field called driverClass
• Make sure you Configuration.yml is formatted properly according to the yaml specification . According to the error message, you have the problem exactly because of that.
• Make sure that fields in DataSourceFactory are accessible to Jackson (getters/setters or public fields or right Jackson annotations for allowing setting private fields)

PS You don't have to initialize datasourceFactory via new DataSourceFactory();