Noob Exception Handling Help

Question

OK, basicly. Theres 3 fields. If a user enters data into 1 of the fields, it searches and prints something out of the DB. But if a user enters nothing it should throw an error telling them to input something. It all occurs in the doGet. Experts.. halp?
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
public class PizzaQuery extends HttpServlet
private Statement st;
private Connection con;
private     String sRecords = new String();
private String sSQL = new String();
private String sMessage = new String();
private final String url = "jdbc:odbc:Pizza";
private PrintWriter out;
     public void init(){
          try
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               con = DriverManager.getConnection(url);
          catch (ClassNotFoundException e)
               sMessage = "Failed to load the driver" +e;
          catch (SQLException e)
               sMessage = "Unable to connect"+e;
          public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException
               try
               if (req.getParameter("Name") != null) {
                    String name = req.getParameter("Name");
                    sSQL = "SELECT * FROM PizzaOrder WHERE Name=?";
                    PreparedStatement ps = con.prepareStatement(sSQL);
                    ps.setString(1,name);
                    ResultSet rec = ps.executeQuery();
                    while (rec.next())
                         sRecords += "<tr><td>" + rec.getString(1);
                         sRecords += "</td><td>" + rec.getString(2);
                         sRecords += "</td><td>" + rec.getString(3);
                         sRecords += "</td><td>" + rec.getString(4);
                         sRecords += "</td><td>" + rec.getString(5);
                         sRecords += "</td><td>" + rec.getString(6);
                         sRecords += "</td></tr>";
               if (req.getParameter("City") != null) {
                    String city = req.getParameter("City");
                    sSQL = "SELECT * FROM PizzaOrder WHERE City=?";
                    PreparedStatement ps = con.prepareStatement(sSQL);
                    ps.setString(1,city);
                    ResultSet rec = ps.executeQuery();
                    while (rec.next())
                         sRecords += "<tr><td>" + rec.getString(1);
                         sRecords += "</td><td>" + rec.getString(2);
                         sRecords += "</td><td>" + rec.getString(3);
                         sRecords += "</td><td>" + rec.getString(4);
                         sRecords += "</td><td>" + rec.getString(5);
                         sRecords += "</td><td>" + rec.getString(6);
                         sRecords += "</td></tr>";
               if(req.getParameter("Size") != null) {
                    String size = req.getParameter("Size");
                    sSQL = "SELECT * FROM PizzaOrder WHERE Size=?";
                    PreparedStatement ps = con.prepareStatement(sSQL);
                    ps.setString(1,size);
                    ResultSet rec = ps.executeQuery();
                    while (rec.next())
                         sRecords += "<tr><td>" + rec.getString(1);
                         sRecords += "</td><td>" + rec.getString(2);
                         sRecords += "</td><td>" + rec.getString(3);
                         sRecords += "</td><td>" + rec.getString(4);
                         sRecords += "</td><td>" + rec.getString(5);
                         sRecords += "</td><td>" + rec.getString(6);
                         sRecords += "</td></tr>";
               if (sRecords != null)
                    res.setContentType("text/html");
                    out = res.getWriter();
                    out.println("<b><u>Pizza Orders</u></b><br /><br /><table border = 6>");
                    out.println("<th>Order</th><th>Name</th><th>Address</th><th>City</th><th>Size</th><th>Toppings</th>");
                    out.println(sRecords);
                    out.println("</table>");     
                    out.println("<br>");     
                    out.println("<br>");                    
               } else {
                    sMessage = "Please input SOMETHING!";
                    out.println(sMessage);     
               sRecords ="";
               catch (SQLException e)
                    sMessage = "Failed to submit data "+e;
          public void destroy()
               try
                    st.close();
                    con.close();     
               catch (SQLException e)
                    sMessage = "Database not closed " + e;
}

Answer 1

FuNk wrote:
Exacly rayom. It just doens't want to work?...
rayom, flounder, can i show you through vnc if you have time?No.
Well here is something you could do that is less ideal but should work.
boolean isProcessed = false;
if(A){
  // do A
  isProcessed = true;
if((!isProcessed)&&(B)){
  // do B
  isProcessed = true;
if((!isProcessed)&&(C)){
  // do C
  isProcessed = true;
if(!isProcessed){
  // user did not supply ANY values. say something here.
}That's an idea anyway. It's copying the if else structure which I suppose you got lost in the braces somewhere or something. But give it a shot.
Have to walk my dog and eat dinner now so don't panic if I'm not back for awhile.