Changes to Configuration class to enable database connection in a Dropwizard project

DWGettingStartedConfiguration.java

public class DWGettingStartedConfiguration extends Configuration {
  
  ...

    /**
     * A factory used to connect to a relational database management system.
     * Factories are used by Dropwizard to group together related configuration
     * parameters such as database connection driver, URI, password etc.
     */
    @NotNull
    @Valid
    private DataSourceFactory dataSourceFactory
            = new DataSourceFactory();

    ...
    
    /**
     * A getter for the database factory.
     *
     * @return An instance of database factory deserialized from the
     * configuration file passed as a command-line argument to the application.
     */
    @JsonProperty("database")
    public DataSourceFactory getDataSourceFactory() {
        return dataSourceFactory;
    }

}