date problem

I am receiving 2 string values in a form which are in
dd-mmm-yy format. i need to insert them in oracle database using Stament.
i am doing the following:
String txt1 = request.getParameter("txt1");
String txt2 = request.getParameter("txt2");

SimpleDateFormat formatter = new SimpleDateFormat("dd-mmm-yy ");
java.sql.Date effect_from = new java.sql.Date(formatter.parse(txt1).getTime());
java.sql.Date end_on = new java.sql.Date(formatter.parse(txt2).getTime());

But i am getting incorrect results.
plz help.

This question would be better asked in the Java forum.