When I run the class Test01, the following error appears: "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '=' CLIENT '' at line 1

CounterModel

package model;
import accesobd.AccesoBD;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;


public class ContadorModel {

    public static String getContador(String nombreTabla) throws Exception {

        Connection cn=AccesoBD.getConnection();
        PreparedStatement ps= null;
        ResultSet rs= null;
        String contador= null;

        String sql= "Select right(concat(repeat('0', int_contlongitud)," +
                "int_contitem),int_contlongitud) as item from contador" +
                "where vch_conttabla = ?";

        ps=cn.prepareStatement(sql);
        nombreTabla = nombreTabla.toUpperCase();
        ps.setString(1, nombreTabla);
        rs=ps.executeQuery();

        if(!rs.next()){
            return contador;
        }

        contador = rs.getString("item");

        sql="update contador" +
        "set int_contitem= int_contitem +1"+
                "where vch_conttabla= ?";
        ps=cn.prepareStatement(sql);
        ps.setString(1, nombreTabla);
        ps.executeUpdate();

        rs.close();
        ps.close();

        return contador;
    }//getContador
}//Contador model

Test01

I used CounterModel.getContent ("client") where I put customer to have as item 00021.

I show the query that is correct in Workbench Select right (concat (repeat ('0', int_contlongitude), int_contitem), int_contlongitud) as item from counter where vch_conttabla = 'client'

package Pruebas;
import model.ContadorModel;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Prueba01 {
    public static void main(String[] args) {
        try {

            System.out.println(ContadorModel.getContador("cliente"));
        } catch (Exception ex) {
            Logger.getLogger(Prueba01.class.getName()).log(Level.SEVERE, null, ex);
        }

}
} 

Please someone to help me see what my mistake is, because it tells me that the client is wrong and I do not understand much.

Table counter