Program: 6953
Project: 6953
Buggy source:
/** 
 * Create a windows style symbolic link, which is slightly different than the linux symbolic links. The commands that can be run in an mklink can be seen <a href="http://technet.microsoft.com/en-us/library/cc753194(WS.10).aspx">here</a>. This operation will only work on Windows Vista and up, attempting to use this on Windows XP and below will result in an exception and will perform a regular copy.
 * @param src       The source file
 * @param dest      The destination file
 * @param l         A copy progress listener to be used to listen to operations during the mklink/copy
 * @param overwrite A flag that if set to true, and the destination file already exists, then the operation willstop and the destination file will not be deleted.
 * @throws IOException Will be thrown should anything happen during the mklink process on the filesystem.
 */
public static void windowsSymlink(File src,File dest,CopyProgressListener l,boolean overwrite) throws IOException {
  try {
    if (dest.exists()) {
      if (!dest.isFile()) {
        throw new IOException("String_Node_Str" + dest);
      }
      if (!overwrite) {
        Message.verbose(dest + "String_Node_Str");
        return;
      }
    }
    if (dest.getParentFile() != null) {
      dest.getParentFile().mkdirs();
    }
    Runtime runtime=Runtime.getRuntime();
    Message.verbose("String_Node_Str" + src.getAbsolutePath() + "String_Node_Str"+ dest.getPath()+ "String_Node_Str");
    Process process=runtime.exec(new String[]{"String_Node_Str",src.getAbsolutePath(),dest.getPath()});
    if (process.waitFor() != 0) {
      InputStream errorStream=process.getErrorStream();
      InputStreamReader isr=new InputStreamReader(errorStream);
      BufferedReader br=new BufferedReader(isr);
      StringBuffer error=new StringBuffer();
      String line;
      while ((line=br.readLine()) != null) {
        error.append(line);
        error.append('\n');
      }
      throw new IOException("String_Node_Str" + src + "String_Node_Str"+ dest+ "String_Node_Str"+ error);
    }
    if (!dest.exists()) {
      throw new IOException("String_Node_Str" + dest + "String_Node_Str");
    }
    if (dest.getAbsolutePath().equals(dest.getCanonicalPath())) {
      dest.delete();
      throw new IOException("String_Node_Str" + dest + "String_Node_Str");
    }
  }
 catch (  IOException x) {
    Message.verbose("String_Node_Str");
    StringWriter buffer=new StringWriter();
    x.printStackTrace(new PrintWriter(buffer));
    Message.debug(buffer.toString());
    FileUtil.copy(src,dest,l,overwrite);
  }
catch (  InterruptedException x) {
    Thread.currentThread().interrupt();
  }
}

Fixed version (ground truth):
/** 
 * Create a windows style symbolic link, which is slightly different than the linux symbolic links. The commands that can be run in an mklink can be seen <a href="http://technet.microsoft.com/en-us/library/cc753194(WS.10).aspx">here</a>. This operation will only work on Windows Vista and up, attempting to use this on Windows XP and below will result in an exception and will perform a regular copy.
 * @param src       The source file
 * @param dest      The destination file
 * @param l         A copy progress listener to be used to listen to operations during the mklink/copy
 * @param overwrite A flag that if set to true, and the destination file already exists, then the operation willstop and the destination file will not be deleted.
 * @throws IOException Will be thrown should anything happen during the mklink process on the filesystem.
 */
public static void windowsSymlink(File src,File dest,CopyProgressListener l,boolean overwrite) throws IOException {
  try {
    if (dest.exists()) {
      if (!dest.isFile()) {
        throw new IOException("String_Node_Str" + dest);
      }
      if (!overwrite) {
        Message.verbose(dest + "String_Node_Str");
        return;
      }
    }
    if (dest.getParentFile() != null) {
      dest.getParentFile().mkdirs();
    }
    if (!mklinkWorks) {
      FileUtil.copy(src,dest,l,overwrite);
    }
 else {
      Runtime runtime=Runtime.getRuntime();
      Message.verbose("String_Node_Str" + src.getAbsolutePath() + "String_Node_Str"+ dest.getPath()+ "String_Node_Str");
      Process process=runtime.exec(new String[]{"String_Node_Str",src.getAbsolutePath(),dest.getPath()});
      if (process.waitFor() != 0) {
        InputStream errorStream=process.getErrorStream();
        InputStreamReader isr=new InputStreamReader(errorStream);
        BufferedReader br=new BufferedReader(isr);
        StringBuffer error=new StringBuffer();
        String line;
        while ((line=br.readLine()) != null) {
          error.append(line);
          error.append('\n');
        }
        throw new IOException("String_Node_Str" + src + "String_Node_Str"+ dest+ "String_Node_Str"+ error);
      }
      if (!dest.exists()) {
        throw new IOException("String_Node_Str" + dest + "String_Node_Str");
      }
      if (dest.getAbsolutePath().equals(dest.getCanonicalPath())) {
        dest.delete();
        throw new IOException("String_Node_Str" + dest + "String_Node_Str");
      }
    }
  }
 catch (  IOException x) {
    if (mklinkWorks) {
      Message.info("String_Node_Str");
      mklinkWorks=false;
    }
    StringWriter buffer=new StringWriter();
    x.printStackTrace(new PrintWriter(buffer));
    Message.debug(buffer.toString());
    FileUtil.copy(src,dest,l,overwrite);
  }
catch (  InterruptedException x) {
    Thread.currentThread().interrupt();
  }
}