Cant delete all files in a directory in servlet in NetBeans

[Sarika Sukumaran]

I cant delete all files in a directory. Its a servlet application in NetBeans. Please help me. Its urgent.

 public static boolean deleteDir(File dir) {
            if (dir.isDirectory()) {
                String[] children = dir.list();
                for (int i=0; i<children.length; i++) {
                    boolean success = deleteDir(new File(dir, children[i]));
                    if (!success) {
                        return false;
                    }
                }
            }
        
            // The directory is now empty so delete it
            return dir.delete();

I have 29 ".properties" files in folder. But in this loop always at least one file remain non deleted. Hence I cant delete the folder.