Java's FileVisitor memory problems

private java.util.List<String> searchFiles2(String FilePath, final String pattern) throws FileNotFoundException, AccessDeniedException
    {
        File file = new File(FilePath);
        if (!file.isDirectory()) {
            throw new IllegalArgumentException("file has to be a directory");
        }

        final List<String> FoundDirectories = new ArrayList<String>();
        try {
            Path startPath = Paths.get(FilePath);
            Files.walkFileTree(startPath, new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult preVisitDirectory(Path file, final BasicFileAttributes attrs)  throws IOException {
                    try {
                        final String name = file.getFileName().toString();
                        // skip hidden files:
                        if (name.startsWith(".") || new File(file.toString()).isHidden()) {
                            return FileVisitResult.SKIP_SUBTREE;
                        }

                    return FileVisitResult.CONTINUE;
                }
                catch(NullPointerException ex)
                {
                    return FileVisitResult.CONTINUE;
                }
            }

                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                        throws IOException {
                    File myFile =new File(file.toString());
                    boolean hidden = myFile.isHidden();

                    if(attrs.isRegularFile() && !hidden) {
                        Scanner scanner = new Scanner(file);
                        System.out.print(file + "\n");
                        if (scanner.findWithinHorizon(pattern, 0) != null) {
                            FoundDirectories.add(file.toString());
                            scanner.close();
                            return FileVisitResult.SKIP_SIBLINGS;
                        }
                        scanner.close();
                    }
                        return FileVisitResult.CONTINUE;
                }


                    @Override
                    public FileVisitResult visitFileFailed(Path file, IOException e)
                    throws IOException {
                        System.err.printf("Visiting failed for %s\n", file);

                        return FileVisitResult.SKIP_SUBTREE;
                    }


            });
        }
        catch(Exception ex)
        {
            System.out.print(ex.getMessage());
            return FoundDirectories;
        }
        return FoundDirectories;
    }

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