JDBC Call MySQL Proc

MySQL PROC :

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CREATE DEFINER=`root`@`%` PROCEDURE `proc_sequence`(OUT sequence varchar(25))
BEGIN
        SELECT CONCAT(prefix, imsi, Date_format(yearmonthday,'%Y%m%d'), sufix) INTO sequence
        FROM ra_sequence
        WHERE seq_id=1 ;
    UPDATE ra_sequence SET yearmonthday = current_date , sufix =sufix + 1
        WHERE prefix='xg' AND imsi='00000000001' AND seq_id = 1 ;
END

 

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JAVA CODE

 

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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.mysql.jdbc.CallableStatement;

public class ConnectionMySQL {
    public static Connection getConnection() throws Exception {
        String driver = "org.gjt.mm.mysql.Driver";
        String url = "jdbc:mysql://127.0.0.1:3306/redantsDB?useUnicode=true&characterEncoding=UTF-8";
        String username = "root";
        String password = "123";

        Class.forName(driver);
        Connection conn = (Connection) DriverManager.getConnection(url,
                username, password);
        return conn;
    }

    public static void main(String[] args) {

        Connection connection = null;
        CallableStatement callableStatement = null;
        try {
            connection = getConnection();
            String proc_name = "{CALL proc_sequence(?)}";
            callableStatement = (CallableStatement) connection
                    .prepareCall(proc_name);
            callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
            callableStatement.executeUpdate();

            System.out.println(callableStatement.getString(1));
        } catch (Exception e) {
            e.printStackTrace();
        } finally {

            try {
                if (null != callableStatement) {
                    callableStatement.close();
                }
                if (null != connection) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}