Error in updating record - Please help

Can anyone please help to explain why there's such error message? (I copy this code from the textbook.)

******

Root cause:

java.lang.ArrayIndexOutOfBoundsException

*****

<%

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

Connection con = DriverManager.getConnection("jdbc:odbc:mydatabase777");

Statement updStmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

ResultSet updRs = updStmt.executeQuery("SELECT * FROM Employees");

updRs.moveToInsertRow();

updRs.updateInt("employee_id",104);

updRs.updateString("name","George");

updRs.updateInt("extension",1871);

updRs.insertRow();

con.close();

%>

[746 byte] By [s29763] at [2007-9-26 2:35:33]