Java Does Not Throw Exception When Writing To Read-Only Files

Question

I have noticed that when I try to write to a read-only file in a window environment, Java does not throw an IOExcpetion, it just dosn't write to the file.
I am writing an FTP server and here is the code:
     public static long copyStream(InputStream in, OutputStream out)throws IOException
          IOException exception = null;
          long copied = 0;
          try
               byte buffer[] = new byte[1024];
               int read;
               while((read = in.read(buffer)) != -1)
                    out.write(buffer, 0, read);
                    copied += read;
          catch(IOException e)
               //ensures that the streams are closed.
               exception = e;
          try
               in.close();//ensures output stream gets closed, even if there is an
               //excption here.
          catch(IOException e){exception = e;}
          out.close();//try to close output.
          if(exception != null)
               //exception is not null, an exception has occured.
               //rethrow exception.
               throw exception;
          return copied;//all ok, return bytes copied.
     }Is this a bug in JAVA VM? Is so, how should I report it?

Answer 1

I have noticed that when I try to write to a read-only file in a window environment,
Java does not throw an IOExcpetion, it just dosn't write to the file.C:\source\java\Markov>attrib readonly.out
A R C:\source\java\Markov\readonly.out
�C:\source\java\Markov>java b
java.io.FileNotFoundException: readonly.out (Access is denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at b.main(b.java:5)
import java.io.*;
public class b {
    public static void main(String[] args) {
     try     {
          OutputStream os = new FileOutputStream ( "readonly.out");
     catch (Exception e) {
          e.printStackTrace();
}