java.lang.NoClassDefFoundError: java.sql.Connection

[Jorge Lebrato]

I'm tryng yo use the mysql-connector-java-5.0.8 to access a database from an application that i'm doing with jme
I don't know why i hace this error when i try execute my program
This is my code

import java.sql.*;

......
......

try {
Class.forName("org.gjt.mm.mysql.Driver");
} catch (Exception e) {
e.printStackTrace();
}

try {
Connection conexion = DriverManager.getConnection("jdbc:mysql://host", "user", "password");
Statement s = conexion.createStatement();
//ResultSet rs = s.executeQuery ("select * from table");
//while (rs.next()) {
// System.out.println (rs.getString (1) + " " + rs.getString (2)+ " " + rs.getString(3));
//}
//conexion.close();
} catch (Exception e) {
e.printStackTrace();
}

If i execute this in my pc, it works (in NetBeans) but, when i try it in my device, i have this problem

any idea?