Out of Heap memory in browser

package com.teamtreehouse;

import java.util.Arrays;
import java.util.List;

public class Main {

    public static void main(String[] args) {
        //Instantiate a new Prompter object and prompt for the story template
        Prompter prompter = new Prompter();
        String story = "Thanks __name__ for helping me out.  You are really a __adjective__ __noun__ and I owe you a __noun__.";
        Template tmpl = new Template(story);
        //Use the prompter object to have it do the prompting, censoring and outputting.  Call Prompter.run
        prompter.run(tmpl);
    }
}

package com.teamtreehouse;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;


public class Prompter {
    private BufferedReader mReader;
    private Set<String> mCensoredWords;

    public Prompter() {
        mReader = new BufferedReader(new InputStreamReader(System.in));
        loadCensoredWords();
    }

    private void loadCensoredWords() {
        mCensoredWords = new HashSet<String>();
        Path file = Paths.get("resources", "censored_words.txt");
        List<String> words = null;
        try {
            words = Files.readAllLines(file);
        } catch (IOException e) {
            System.out.println("Couldn't load censored words");
            e.printStackTrace();
        }
        mCensoredWords.addAll(words);
    }

    public void run(Template tmpl) {
        List<String> results = null;
        try {
            results = promptForWords(tmpl);
        } catch (IOException e) {
            System.out.println("There was a problem prompting for words");
            e.printStackTrace();
            System.exit(0);
        }
        // Print out the results that were gathered here by rendering the template
        // List<String> fakeResults = Arrays.asList("friend", "talented", "java programmer", "high five");
        String renderedResults = tmpl.render(results);
        System.out.printf("Your TreeStory:%n%n%s", renderedResults);
    }

    /**
     * Prompts user for each of the blanks
     *
     * @param tmpl The compiled template
     * @return
     * @throws IOException
     */
    public List<String> promptForWords(Template tmpl) throws IOException {
        List<String> words = new ArrayList<String>();
        for (String phrase : tmpl.getPlaceHolders()) {
            String word = promptForWord(phrase);
            words.add(word);
        }
        return words;
    }


    /**
     * Prompts the user for the answer to the fill in the blank.  Value is guaranteed to be not in the censored words list.
     *
     * @param phrase The word that the user should be prompted.  eg: adjective, proper noun, name
     * @return What the user responded
     */
    public String promptForWord(String phrase) throws IOException {

        String response;

        //Prompt the user for the response to the phrase, make sure the word is censored, loop until you get a good response.
        boolean clean = false;
        do {
            System.out.printf("%s\n",phrase);
            response = mReader.readLine();
            if( response != null ) {
                response = response.replaceAll("\\s+","");
                //System.out.printf("Response length = %d\n",response.length());
                //check if response contains any bad words.
                if (response.length() > 0) {
                    clean = true;
                    for (String word : mCensoredWords) {
                        if (response.toLowerCase().contains(word)) {
                            System.out.printf("\n Sorry '%s' is a censored word...\n...please retry..", word);
                            clean = false;
                            break;
                        }
                    }
                }
            }
        } while(!clean);

        return response;
    }
}