Error in my webapp

Question

Hello everyone. I'm running a webstore on Tomcat 3.2.3 and though everything looks right, I'm getting the following error in the console window:
2002-03-20 22:27:01 - Ctx( /RobertDouglass ): IOException in: R( /RobertDouglass
+ /img/Beetle6.jpg + null) Software caused connection abort: socket write error
What is curious to me is the + null. I don't have any idea how it is getting there, or if that is the cause of the error. I also don't understand what R(............) is. There is no method in my code named R().
The other bug in my application could be related to this. I have a catalog of items, represented by item beans, that are listed for sale. These are loaded from a database. When the application starts, everything is fine. After some time, or after some certain event, the first item can no longer be added to the cart. There is a large amount of code behind all of this, so I'll post that in seperated responses. Thanks for any ideas that you may have.
-Robert Douglass

Answer 1

and a sample bean:
import java.sql.*;
import java.util.*;
* <p>This is the Java bean used to get and display information about
* items for sale in our web based store.
* @see DBBeanBase
public class ItemBean extends DBBeanBase
* <p>Default constructor, creates an empty {@link ItemBean}.
public ItemBean()
{ super(); }
* <p>Copy constructor. This constructor creates a {@link ItemBean} object
* that is initially populated with a copy of the {@link Map} specified
* as a parameter to this constructor. All {@link java.util.Map Maps} should
* implement a copy constructor.
* @param copyThisMap the {@link Map} used to initialize this {@link ItemBean} object.
public ItemBean(Map copyThisMap)
{ super(copyThisMap); }
* <p>This constructor creates an {@link ItemBean} object and
* populates it with the fields in a {@link java.sql.ResultSet}.
* @param rs The {@link java.sql.ResultSet} object used to populate
* this class with information about an item.
* @throws java.sql.SQLException if there is an error iterating the
* {@link java.sql.ResultSet}.
protected ItemBean(ResultSet rs) throws SQLException
{ super(rs); }
* <p>This constructor creates an {@link ItemBean} object associated with the
* specified item id. If there is no record in the data source with the
* specified item id, an exception is thrown.
* @param connection The {@link java.sql.Connection} object used to execute
* the select statement that will retrieve the item information.
* @param iItemId specifies the item id used to populate this object.
* @throws java.sql.SQLException if there is an error selecting the item
* information.
* @throws java.lang.Exception if the item id is invalid.
public ItemBean(Connection connection, String strItemId) throws SQLException, Exception
super();
String strSQL = "SELECT * FROM Item WHERE ItemId = " + strItemId;
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery(strSQL);
if (rs.next())
populateFromResultSet(rs);
else
throw new Exception("Invalid item Id: " + strItemId);
* <p>This method returns the item's Id.
* @return the item's id.
public String getItemId()
{return get("ITEMID").toString();}
* <p>This method returns the name of the item's image.
* @return the name of the item's image.
public String getImage()
{return get("IMAGE").toString();}
* <p>This method returns the item's description.
* @return the item's description.
public String getDescription()
{return get("DESCRIPTION").toString();}
* <p>This method returns the price of the item as a {@link java.lang.Double}.
* @return the price of the item as a {@link java.lang.Double}.
public Double getPrice()
{return (Double)get("Price");}
* <p>This method returns a quantity for this item as an {@link java.lang.Integer}.
* An item may or may not have a quantity. If they do not, default the quantity to
* zero.
* @return the item's quantity if it exists, otherwise return zero.
public Integer getQuantity()
Integer qty = new Integer(0);
if (get("QTY") != null)
qty = (Integer)get("QTY");
return qty;
* <p>This method returns a textual representation of this {@link ItemBean}.
* @return a textual representation of this {@link ItemBean}.
public String toString()
StringBuffer sb = new StringBuffer();
sb.append("ItemId: " + getItemId() + "\n");
sb.append("Image: " + getImage() + "\n");
sb.append("Description: " + getDescription() + "\n");
sb.append("Price: $" + getPrice().toString() + "\n");
sb.append("Qty: " + getQuantity().toString() + "\n");
return sb.toString();
* <p>This method returns a {@link java.util.Collection} of all of the items
* in the data source. This is really the store's catalog.
* @param connection The {@link java.sql.Connection} object used to execute
* the select statement that will retrieve the items.
* @return a {@link java.util.Collection} of all of the items in the data source.
* @throws java.sql.SQLException if there is an error selecting the items.
public static Collection getAllItems(Connection connection) throws SQLException
Collection col = new ArrayList();
String strSQL = "SELECT * FROM Item";
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery(strSQL);
while (rs.next())
col.add(new ItemBean(rs));
return col;
* <p>Test method used to test this class. This method creates an ItemBean
* object using the specified DBURL and item id. The contents of the ItemBean are
* printed to the console. In addition, this method gets a
* {@link java.util.Collection} of all of the items in the data source and prints
* them on the console.
* <p>This test method assumes that the database is a HypersonicSQL database that
* contains an 'sa' account with no password.
* <pre>
* usage: java DBBean [DBURL] [itemId]
* </pre>
* @param args an array of command line arguments. This test method
* takes two parameters, one that specifies the DBURL and the other specifies
* the item id.
public static void main(String[] args)
     Connection connection = null;
     try
if (args.length != 2)
System.out.println("usage: java ItemBean [DBURL] [itemId]");
System.exit(0);
          String strDBDriver = "org.hsql.jdbcDriver";
          String strDBURL = args[0];
          String strDBUSER = "sa";
          String strDBPWD = "";
          Class.forName(strDBDriver);
          connection = DriverManager.getConnection(strDBURL,
                                                            strDBUSER,
                                                            strDBPWD);
DBBeanBase itemBean = new ItemBean(connection, args[1]);
System.out.println("An Order:\n" + itemBean);
System.out.println("All Items:\n" + ItemBean.getAllItems(connection));
     catch (Exception e)
          e.printStackTrace();
     finally
          try
               connection.close();
          catch (Exception e)
}