我正在尝试将我的Android应用程序连接到MySql服务器，但是它显示了我无法解决的错误。我正在为我的SQL Server使用主机

Question

1. 导入java.sql.DriverManager;导入java.sql.Connection;导入
   java.sql.PreparedStatement;导入java.sql.SQLException;

      public class DatabaseHandler extends Configs{    Connection dbConnection;
      public Connection getDbConnection()
      throws ClassNotFoundException, SQLException{
   
      String connectionString = "jdbc:mysql://" + dbHost +  ":"+dbHost +"/" + dbName;
   
      Class.forName("com.mysql.cj.jdbc.Driver");
      dbConnection = DriverManager.getConnection(connectionString, dbUserName,dbUserPassword);
      return dbConnection;    }
      public  void sign_up_user(String login, String password){
      String insert ="INSERT INTO " + ConstForDb.TABLE_NAME + "(" + ConstForDb.USERS_LOG + "," +
              ConstForDb.USERS_PASSWORD + ")" + "VALUES(?,?)";
   
     try {
         PreparedStatement preparedStatement = getDbConnection().prepareStatement(insert);
         preparedStatement.setString(1 ,ConstForDb.USERS_LOG);
         preparedStatement.setString(2 , ConstForDb.USERS_PASSWORD);
         preparedStatement.executeUpdate();
     }
     catch (SQLException e) {
         e.printStackTrace();
     } catch (ClassNotFoundException e) {
         e.printStackTrace();
     }    }; }
   

我得到了我无法解决的错误：

       Caused by: java.lang.BootstrapMethodError: Exception from call site #37 bootstrap method
       at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.<clinit>(AbandonedConnectionCleanupThread.java:58)
       at java.lang.Class.classForName(Native Method)
       at java.lang.Class.forName(Class.java:453)
       at java.lang.Class.forName(Class.java:378)
       at com.mysql.cj.jdbc.NonRegisteringDriver.<clinit>(NonRegisteringDriver.java:99)
       at java.lang.Class.classForName(Native Method)
       at java.lang.Class.forName(Class.java:453)
       at java.lang.Class.forName(Class.java:378)
       at batyr.project.kaitaxi.DatabaseHandler.getDbConnection(DatabaseHandler.java:20)
       at batyr.project.kaitaxi.DatabaseHandler.sign_up_user(DatabaseHandler.java:30)
       at batyr.project.kaitaxi.Reg.accept_reg(Reg.java:84)
       at java.lang.reflect.Method.invoke(Native Method) 
       at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) 
       at android.view.View.performClick(View.java:6294) 
       at android.view.View$PerformClick.run(View.java:24770) 
       at android.os.Handler.handleCallback(Handler.java:790) 
       at android.os.Handler.dispatchMessage(Handler.java:99) 
       at android.os.Looper.loop(Looper.java:164) 
       at android.app.ActivityThread.main(ActivityThread.java:6494) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
    Caused by: java.lang.NoClassDefFoundError: Invalid descriptor: VLLI

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