我跟着https://sqoop.apache.org/docs/1.99.4/restapi.html 因为尝试了sqoop2。但是iam在linkconfig.getstringinput（“linkconfig.connectionstring”）行上获取错误“exception in thread”main“org.apache.sqoop.common.sqoopexception:model\u 011:输入不存在-输入名称：linkconfig.connectionstring”。setvalue（“jdbc:mysql：//localhost/my“）；我在终端上测试了sqoop2，mysql，数据库等，工作正常。请帮忙。提前谢谢。
这是我正在尝试的代码

import org.apache.sqoop.client.SqoopClient;
import org.apache.sqoop.model.MLink;
import org.apache.sqoop.model.MLinkConfig;
import org.apache.sqoop.validation.Status;
public class Sqoop2 {
     public static void main(String[] args) {
         //Initialization SqoopClient
         String url = "http://<myip>:12000/sqoop/";
         SqoopClient client = new SqoopClient(url);

        // create a placeholder for link
         long connectorId = 1;
         MLink link = client.createLink(connectorId);
         link.setName("Vampire");
         link.setCreationUser("Buffy");
         MLinkConfig linkConfig = link.getConnectorLinkConfig();
         // fill in the link config values
         linkConfig.getStringInput("linkConfig.connectionString").setValue("jdbc:mysql://<myip>/<dbname>");
         linkConfig.getStringInput("linkConfig.jdbcDriver").setValue("com.mysql.jdbc.Driver");
         linkConfig.getStringInput("linkConfig.username").setValue("root");
         linkConfig.getStringInput("linkConfig.password").setValue("root");
         // save the link object that was filled
         Status status = client.saveLink(link);
         if(status.canProceed()) {
          System.out.println("Created Link with Link Id : " + link.getPersistenceId());
         } else {
          System.out.println("Something went wrong creating the link");
         }   
       }
    }