Complier output question

Question

I've been working on a java assignment that requires me to write a command line program which will read data from a text file, store the data in a vector and then save the vector to another file in a serialized form. I have written this program using the Kawa complier software.
I have, what I believe to be, a working program; it complies without reporting any errors, but when I try to run the program, I get the following message in the complier output window.
'Exception in thread "main"'
Can someone tell me what this means?
Thanks.

Answer 1

Thanks for the suggestions, but I found a solution for it after posting the question. Another problem has come up now though.
As I stated, the program is supposed to read the data from a text file, store it in a vector, and output it to another file in serialized form.
The input file consists of many records of computers and peripherals. Each record uses four lines of the input file, and is displayed like this:
Description (String)
Price (float)
VAT Price (float)
Quantity (integer),
Now I think the output file is supposed to look the same as the input file, but the one my program generates doesn't. My program code is as follows:
import java.util.*;
import java.io.*;
import java.lang.*;
class TextToVector
     public static void main(String [] args) throws IOException
          try
          Vector v = new Vector(); //creates the vector
          String inFile = new String ("C:/My Documents/V3/Data/stocklist.txt ");     //Informs the program of the name, type & location of the source file
          FileOutputStream outFileStream = new FileOutputStream("C:/My Documents/V3/outfile.dat ");     //Instructs the program where to create the output file, what type of file it should be & what to name it
          //the command paths used in these lines can be modified to read/send a file from/to
          //where ever the user wants, the user must also set these identical paths in
          //the "Interpreter Options" for this to work correctly
          ObjectOutputStream objOutStream = new ObjectOutputStream(outFileStream);
          objOutStream.writeObject(v);     //writes the object to the vector
          objOutStream.flush();                     //purges the objOutStream
          outFileStream.close();                     //closes the objOutStream
          catch (IOException e)
          System.out.println("Exception Writing File ");
          System.exit(1);
public Vector readRecord(String inFile, Vector v) throws IOException
          String inString = new String(" ");
          String D = " ";
     float P = 0.0f;
     float V = 0.0f;
     int Q = 0;
          int count=0;
          BufferedReader buffReader = null;     //enures the BufferedReader is empty before beginning to read the source file
          buffReader = new BufferedReader(new FileReader (inFile));     //used to read & record each line of the source file
try
     while((inString = buffReader.readLine()) !=null)
     count++;
     if(count==1)
     inString = buffReader.readLine();
     D = inString;
     if(count==2)
     inString = buffReader.readLine();
     P = (Float.valueOf(inString)).floatValue();
     if(count==3)
     inString = buffReader.readLine();
     V = (Float.valueOf(inString)).floatValue();
          if(count==4)
     inString = buffReader.readLine();
     Q = (Integer.valueOf(inString)).intValue();
     if(count==5)
     //System.out.println("Description " + D + " Price " + P + " VATPrice " + V + " Quantity " + Q);
     StockItem record = new StockItem(D,P,V,Q);
     v.add (record);
     count=0;
buffReader.close();
return v;
catch(IOException e)
System.out.println(e.toString());
return v;
class StockItem implements Serializable
     private String D;
private float P;
private float V;
private int Q;
     StockItem()
     D = " ";
     P = 0.0f;
     V = 0.0f;
     Q = 0;
     StockItem(String Description, float Price, float VATPrice, int Quantity)
     D = Description;
     P = Price;
     V = VATPrice;
     Q = Quantity;
     public String getDescription()
return D;
public float getPriceValue()
return P;
public float getVATPriceValue()
return V;
public int getQuantityValue()
return Q;
Can anyone see anything wrong with this? I'd appreciate any suggestions. Thanks.