Common causes of java.io.filenotfoundexception

Question

hi,
what are the most obvious causes of a java.io.FileNotFoundException being thrown.
this is occuring in an application i have written - the exception is being thrown everytime a new FileReader is tried to be created.
the files i am trying to read in are not read only files, they do exist and the pathname is correct...
thanks in advance

Answer 1

i specify the pathname as one of the arguments that i pass to the application so when it throws the exception (which i do have a catch clause for btw) it shows me the pathname i have previously specified.
everyones help is well appreciated (this is after one or two cups of irish java!!!).
the full code for the program is as follows:
import java.io.*;
public class tArray {
     public static void main(String[] args) {
          tArr arr = new tArr(args[0], args[1]);
          arr.convert();
class tArr {
     String sourceName;
     String sourceString;
     tArr(String sourceArg, String sourceArg1) {
          sourceName = sourceArg;
          sourceString = sourceArg1;
     void convert() {
          try {
               File source = new File(sourceName);
               File temp = new File(sourceName + ".tmp");
               File[] fileArr = source.listFiles();
               for (int y = 0; y < fileArr.length; y++)
                    System.out.println("listFiles: "
                    + fileArr[y].toString());
               FileReader fr = new FileReader(source);
               BufferedReader in = new BufferedReader(fr);
               if (source.isDirectory())
                    System.out.println("is a directory");
               FileWriter fw = new FileWriter(temp);
               BufferedWriter out = new BufferedWriter(fw);
               boolean eof = false;
               String inChar = "";
               String outChar = "";
               do {
                    inChar = in.readLine();
                    if (inChar != null) {
                         if (inChar.startsWith(sourceString))
                              inChar = (" 64 64");
                         else {
                              outChar = (inChar);
                              out.newLine();
                         outChar = (inChar);
                         out.write(outChar);
                    } else
                         eof = true;
               } while (!eof);
               in.close();
               out.close();
               boolean deleted = source.delete();
               if (deleted)
                    temp.renameTo(source);
          } catch (IOException e) {
               System.out.println("Error... " + e.toString());
          } catch (SecurityException se) {
               System.out.println("Error... " + se.toString());
}the listfiles() method is part of the checking process i am going thru to make sure im not going mad (some would say a lost cause...)