MySQL PreparedStatement Error

Question

Hi all. Thanks for previous assistance. I am trying to select from MySQL using a PreparedStatement, however I keep getting the error below. I have included the code from JSP and my Java. When I run the Select statement from a command window it works properly and retrieves the proper information (when I replace the ? with the value from add_confirm.jsp prefix_var). I really appreciate any help.
Gary
*** utility.java ***
public ResultSet getPrefix(int util_prefix) throws SQLException, Exception {
ResultSet rs = null;
try {
PreparedStatement getPre;
getPre = con.prepareStatement (
"select a.util_id, a.util_abbr, a.util_name, b.util_db_id from pre_util a, power_source b where a.util_id = b.util_db_id AND b.util_db_id = ? ;");
getPre.setInt(1, util_prefix);
getPre.execute();
} catch (SQLException e) {
error = "SQLException: get failed" + e.getMessage();
throw new SQLException(error);
} catch (Exception e) {
error = "Exception: An exception occurred while getting utility";
throw new Exception(error);
return rs;
*** add_confirm.jsp ***
<jsp:useBean id="utility" class="com.yb.util.user.utility" />
int prefix_var = Integer.parseInt(request.getParameter("prefix"));
out.println(prefix_var); // the value is being passed correctly
utility.getPrefix((int) prefix_var);
ResultSet rs = utility.getPrefix();
while (rs.next()) {
String prefix_st = "";
prefix_st = rs.getString("a.util_abbr");
*** My Error ***
C:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\jsp\add_005fconfirm_jsp.java:92: getPrefix(int) in com.yb.util.user.utilitycannot be applied to ()
ResultSet rs = utility.getPrefix();
_______________^

Answer 1

utility.getPrefix((int) prefix_var);
ResultSet rs = utility.getPrefix();
You're calling your method twice, the second time without a parameter.
Try
ResultSet rs = utility.getPrefix(prefix_var); (no cast should be necessary)