Error on stored procedure call from jsp

I'm trying to call a stored procedure from a jsp page using the code below,
but I am currently getting th efollowing error message:
"java.sql.SQLException: [BEA][Oracle JDBC Driver]The requested output parameter data is not available."
I am running weblogic 8.1 on my local machine and connecting to an Oracle 8i database.

Can someone tell me why I am getting this error? Thanks in advance for your help!

CallableStatement = conn.prepareCall("{ call ? := Func_Noodle_oqr_one(?,?)}");
st.registerOutParameter(1, OracleTypes.CURSOR);
st.setString(2,"");
st.setInt(3,neuId);
ResultSet rs = (ResultSet)st.getObject(1); // <- The error appears to be occuring at this point
rs = st.executeQuery();
while (rs.next()) {
System.out.println(rs.getString(1) + "\t" +
rs.getFloat(2) + "\t" +
rs.getDate(3).toString());
}

You're giving the ResultSet rs a value, twice.

ResultSet rs = (ResultSet)st.getObject(1); // <- The error appears to be occuring at this point
rs = st.executeQuery();

In my code, I write the following :

StringBuffer zoekString = new StringBuffer();
zoekString.append ("select * from gebruiker ");
zoekString.append("where naam=? and wachtwoord=? ");
Connection con = getConnection();
PreparedStatement ps = con.prepareStatement(zoekString.toString());
ps.setString(1,_naam);
ps.setString(2,_wachtwoord);
ResultSet rs = ps.executeQuery();
if (rs.next() )
{
Gebruiker gebruiker = new Gebruiker(rs);
rs.close();
ps.close();
con.close();
return gebruiker;
}
In short, I use PreparedStatements and the ResultSet is given by the method
executeQuery() of the PreparedStatement.
I've read that PreparedStatements are said to be more performant than Statements.
Try this one