Code works fine in IntelliJ, crashes with OutOfMemoryError in code challenge.

    public String promptForStory()
    {
        String story;
        do
        {
            try
            {
                System.out.println("Enter your __story__: ");
                story = mReader.readLine();
            } catch( IOException e)
            {
                System.out.println("Something exploded, using default string.");
                story = "Thanks __name__ for helping me out.  You are really a __adjective__ __noun__ and I owe you a __noun__.";
            }
        } while( story == null || story.isEmpty() );
        return story;
    }

package com.teamtreehouse;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {

    public static void main(String[] args) {
        Prompter thePrompt = new Prompter();

        String story = "";

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       do
        {
          System.out.println("Enter String Story:");
          try
          {
              story = br.readLine();
          }
          catch(IOException e)
          {
              System.out.println("Something exploded, using default string.");
              e.printStackTrace();
              story = "Thanks __name__ for helping me out.  You are really a __adjective__ __noun__ and I owe you a __noun__.";
          };
        } while (story == null || story.isEmpty());

        Template tmpl = new Template(story);
        thePrompt.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);
        }

        String outputResults = tmpl.render(results);
        System.out.printf("Your TreeStory:%n%n%s", outputResults);

    }

    /**
     * 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 retWord = "";
        while(retWord.isEmpty())
        {
            System.out.printf("Enter a %s: ", phrase);
            retWord = mReader.readLine();

            if(retWord == null || retWord.trim().isEmpty() || mCensoredWords.contains(retWord.trim()))
            {
                System.out.printf("Try one more.%n");
                retWord = "";
            }
        }
        return retWord;
    }
}