Iterating twice over HashMap Java

I have a HashMap declared as

static HashMap<String,ArrayList<Integer>> inverted_index = new HashMap<String,ArrayList<Integer>>();

I iterated over its keys as

    public static void printInvertedIndex() throws FileNotFoundException{
    PrintWriter writer = new PrintWriter(new File("InvertedIndex.txt"));
    Iterator it = inverted_index.entrySet().iterator();

    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)it.next();
        writer.println(pair.getKey() + "  " + pair.getValue());
        it.remove();
        }

    writer.close();
}

I did all this in a function called printInvertedIndex(). Now in some other function I want to iterate over the HashMap again, so I did this

    public static void createPermutermIndex(){
    permuterm_index.clear();

    Iterator it = inverted_index.entrySet().iterator();

    while (it.hasNext()) {
        System.out.println("here");
        Map.Entry pair = (Map.Entry)it.next();
        String temp;
        temp = pair.getKey() + "$";
        ArrayList<String> perms = rotations(temp);
        System.out.println(perms.size());
        for(int i=0; i<perms.size(); i++)
            System.out.println(perms.get(i));
            //permuterm_index.put(temp, perms.get(i));
        it.remove();
        }
    }

But I am not getting "here" printed while calling createPermutermIndex(). That is, my iterator is not iterating over the entries of inverted_index.

Is there any way I can iterate over it again?