Creating a Database application

Question

Hi, I'm new to JSP and Tomcat, I just started learning it last week. I had abit of problem creating a sample Database application.
The problem is the JSP works on Tomcat and the database tables is created in Oracle but it the JSP page just comes up blank.
// This class represents a Title in the pubs database
package pubs;
public class Titles
private String title_id;
private String title;
private String type1;
private String pub_id;
private Double price;
private Double advance;
private Double total_sales;
private String notes;
private String date;
private int contract;
public Titles()
public void settitle_id(String tid) { title_id = tid; }
public void settitle(String t) { title = t; }
public void settype1(String type) { type1 = type; }
public void setpub_id(String pub) { pub_id = pub; }
public void setprice(Double pr) { price = pr; }
public void setadvance(Double adv) { advance = adv; }
public void settotal_sales(Double sales) { total_sales = sales; }
public void setnotes(String n) { notes = n; }
public void setdate(String d) { date = d; }
public void setcontract(int c) { contract = c; }
public String gettitle_id() { return title_id; }
public String gettitle() { return title; }
public String gettype1() { return type1; }
public String getpub_id() { return pub_id; }
public Double getprice() { return price; }
public Double getadvance() { return advance; }
public Double gettotal_sales() { return total_sales; }
public String getnotes() { return notes; }
public String getdate() { return date; }
public int getcontract() { return contract; }
// Note: Quick + Dirty version, clean up as required!!
package pubs;
import java.io.*;
import java.sql.*;
import javax.naming.*;
import javax.sql.*;
import java.util.*;
public class TitlesDAO
private Connection con;
private PreparedStatement selectByTitleID;
private PreparedStatement updateTitlePrice;
private PreparedStatement insertTitle;
private pubs.Titles t1;
private List titlesList = null;
// Constructor gets a DB connection from the connection pool
// Technically there should be no code here as thi is a Java Bean
// Instead this code should be in a seperate connect method
public TitlesDAO() throws SQLException, NamingException
Context init = new InitialContext();
Context ctx = (Context) init.lookup("java:comp/env");
DataSource ds = (DataSource) ctx.lookup("jdbc/myDatabase");
con = ds.getConnection();
// Prepared statements are precompiled for performance
// and also sanity checked for possible errors + security risks
// '?' place holders can be filled in later.
//selectByTitleID = con.prepareStatement("SELECT * FROM Titles WHERE title_id = ?");
selectByTitleID = con.prepareStatement("SELECT * FROM Titles");
updateTitlePrice = con.prepareStatement("UPDATE Titles SET price = ? WHERE title_id = ?");
// Set and get methods - note these are linked to t1, an object
// of class Titles.
public String gettitleID() { return t1.gettitle_id();}
public Double getprice() { return t1.getprice();}
public void settitleID(String t) { t1.settitle_id(t);}
public void setprice(Double p) { t1.setprice(p);}
public List selectByTitle(String tID) throws SQLException
ResultSet results = null;
results = null;
try {
          //selectByTitleID.setString(1,tID);
          results = selectByTitleID.executeQuery();
          this.fillTitles(results);
          return titlesList;
     // Always close a connection when finished
     finally
          try { results.close(); } catch (Exception ex) {}
// Not used as pubs is read only, but code works should it be required
// elsewhere
public int updatePrice() throws SQLException
if (t1.getprice() ==null || t1.gettitle_id() ==null)
return 0;
// Fill in place holders - see prepared statement declaration above
updateTitlePrice.setDouble(1,t1.getprice());
updateTitlePrice.setString(2,t1.gettitle_id());
return updateTitlePrice.executeUpdate();
// Close data access objects and the DB connection
// returning it to the pool
public void close()
try { selectByTitleID.close(); } catch (Exception ex) {}
try { updateTitlePrice.close(); } catch (Exception ex) {}
try { con.close(); } catch (Exception ex) {}
// This method adds a Titles object to titlesList
// for each row in the ResultSet. The List is then returned.
// This avoids the calling JSP having to deal with
// database implementation
private void fillTitles(ResultSet rs) throws SQLException
if (rs == null) return;
//if (titlesList == null)
titlesList = new ArrayList();
rec = 20;
while (rs.next()) {
Titles ti = new Titles();
ti.settitle_id(rs.getString(1));
ti.settitle(rs.getString(2));
ti.settype1(rs.getString(3));
ti.setpub_id(rs.getString(4));
if (rs.getString(5) == null)
     ti.setprice(0.00);
else
     ti.setprice(Double.valueOf(rs.getString(5)));
if (rs.getString(6) == null)
     ti.setadvance(0.00);
else     
     ti.setadvance(Double.valueOf(rs.getString(6)));
if (rs.getString(7) == null)
     ti.settotal_sales(0.00);
else
     ti.settotal_sales(Double.valueOf(rs.getString(7)));
ti.setnotes(rs.getString(8));
ti.setdate(rs.getString(9));
ti.setcontract(Integer.valueOf(rs.getString(10)));
titlesList.add(ti);
<jsp:useBean id="dao" class="pubs.TitlesDAO" scope="session" />
<jsp:setProperty name="dao" property='*'/>
<html>
<body bgcolor="#ffffc9">
<br>
<table width="100%" border="0" cellspacing="0">
<tr>
<td>TITLE_ID</td>
<td>TITLE</td>
<td>TYPE1</td>
<td>PUB_ID</td>
<td>PRICE</td>
     <td>ADVANCE</td>
     <td>TOTAL_SALES</td>
<td>NOTES</td>
     <td>PUBDATE</td>
<td>CONTRACT</td>
</tr>
<%
     // retreive a list of titles from dao
     java.util.List lstTitles = dao.selectByTitle("*");
if (lstTitles == null) {
String result = "NULL";
<tr>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
<td><%=result%></td>
</tr>
<%
} // End of IF block
else
          // The Following HTML is part of this if block
%>
          // Loop through list, getting each Titles object
for(java.util.Iterator i = lstTitles.iterator(); i.hasNext(); )
pubs.Titles t = (pubs.Titles) i.next();
          // The HTML that follows is part of this for block
%>
<tr>
<td><%=t.gettitle_id()%></td>
<td><%=t.gettitle()%></td>
<td><%=t.gettype1()%></td>
<td><%=t.getpub_id()%></td>
<td><%=t.getprice()%></td>
<td><%=t.getadvance()%></td>
<td><%=t.gettotal_sales()%></td>
<td><%=t.getnotes()%></td>
<td><%=t.getdate()%></td>
<td><%=t.getcontract()%></td>
</tr>
<%
} // End of for block
} // End of else block
%>
</table>
</body>
</html>
Can anyone help me out?

Answer 1

No errors come up, it just that the fields that should display data on the titles.jsp file come up blank even though the titles table has been created on Oracle and I have also used another file to connect to Oracle.