How to use Classes stored in "Classes" folder in JSP with tomcat ?

Hello friends
im using tomcat as server and MySQL as a Backend. now i am using the date calculation in Diff.class files which i have stored in catalina_home/webapps/prj_dev/Prj_files/classes/diff/DIff.class.
now i am getting error that :
Generated servlet error:
Only a type can be imported. diff.Diff resolves to a package
wht i have to do ?

I don't include the "classes" word in my import anymore.. Waa.. I'm going nuts.. T.T
Now, I'm trying to use the class through useBean..
this is how my application looks like:
/webapps
-----/hangman-jsp
------------index.jsp
------------/WEB-INF
-------------------web.xml
-------------------MysteryPhrase.java
-------------------/classes
---------------------------/beans
----------------------------------MysteryPhrase.class
-----------/images
-------------------hangman.gif
This is what is in my MysteryPhrase:
package beans;
import java.lang.String;
import java.lang.StringBuffer;
public class MysteryPhrase {
     private String answer;
     private StringBuffer mysteryPhrase;
     private int guesses;
     private char[] alphabet;
     public MysteryPhrase () {
     this.alphabet = new char[26];
public void setMysteryPhrase (String mysteryPhrase) {
     this.answer = mysteryPhrase;
     this.mysteryPhrase = new StringBuffer(mysteryPhrase.length());
     for (int i = 0; i < mysteryPhrase.length(); i++) {
          this.mysteryPhrase.setCharAt(i, '_');
public void setGuess (char guess) {
     for (int i = 0; i < answer.length(); i++) {
          if (answer.charAt(i) == guess) {
               mysteryPhrase.setCharAt(i, guess);
     guesses++;
public String getMysteryPhrase () {
     return mysteryPhrase.toString();
public String getAnswer () {
     return answer;
public int getGuesses () {
     return guesses;
This is what is in my index.jsp (It is not yet finished..I just started..)
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<jsp:useBean id="phrase" class="beans.MysteryPhrase"/>
<jsp:setProperty name="phrase" property="MysteryPhrase" value="Hello!"/>
<html>
     <head>
          <title>JSP/JSTL Implementation of Hangman</title>
          <style type="text/css">
               div {
                    color: white;
                    background-color: gray;
                    position: absolute;
                    border-style: solid;
                    border-width: thin;
                    width: 20%;
                    height: 30%;
                    text-align: center;
               #guessBoard {
                    top: 28%;
                    left: 42%
               #mysteryPhraseBoard {
                    top: 50%;
                    left: 25%;
                    z-index: 2;
               #statisticsBoard {
                    top: 57%;
                    left: 58%;
                    z-index: 2;
               #categoryBoard {
                    top: 23%;
                    left: 10%
               #hangman {
                    top: 7%;
                    left: 70%;
               #char {
                    width: 20px;
               body {
                    background-color: black;
          </style>
     </head>
     <body>
          <div id="categoryBoard">
               <form method="post">
                    Please choose a category:
                    <select name="category">
                         <option>Category 1</option>
                         <option>Category 2</option>
                         <option>Category 3</option>
                         <option>Category 4</option>
                         <option>Category 5</option>
                         <option>Category 6</option>
                         <option>Category 7</option>
                         <option>Category 8</option>
                    </select>
                    <input type="submit" value="Change"/>
               </form>
          </div>
          <div id="mysteryPhraseBoard">
               The mystery phrase is
          </div>
          <div id="guessBoard">
               <form method="post">
                    Enter a letter: <input id="char" type="text" name="letter"/>
                    or
                    Enter a word: <input type="text" name="word"/>
                    <input type="submit" value="Guess"/>
               </form>
          </div>
          <div id="statisticsBoard">
               Guesses: 0
               Remaining Letters: 8
          </div>
          <div id="hangman">
               <img src="images/hangman.gif"/>
          </div>
     </body>
</html>

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