Succeed in getting voice to read text

I am trying to work out how to implement text to speech with java 11 and have written some classes in order to read a text ("Dracula") and then and option to speak the text. Classes: 

package draculatext;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

public class Start {
	public static Queue<String> wholeText = new LinkedList<String>();
	public static BookReadToScreen bookReadToScreen = new BookReadToScreen();
	public static BookReadSpeech bookReadSpeech = new BookReadSpeech();

	public static void main(String[] args) {
		System.out.println("Welcome to QUB Book Read");
		showMenu();
		System.out.println("Application Done");
	}

	public static void showMenu() {
		System.out.println();
		Scanner scanner = new Scanner(System.in);
		int option;
		System.out.println("Book reading ");
		do {
			System.out.println("1. Load book");
			System.out.println("2. Read / Resume book");
			System.out.println("3. Pause read");
			System.out.println("4. Speak book");
			System.out.println("5. Pause speak");
			System.out.println("6. Quit");
			System.out.println("Enter option ...");
			option = scanner.nextInt();
			switch (option) {
			case 1:
				readBookFile();
				System.out.println("Book loaded");
				break;
			case 2:
				if (wholeText.isEmpty()) {
					System.out.println("Load book first...");
				} else {
					readBookToScreen();
				}
				break;
			case 3:
				stopRead();
				break;
			case 4:
				speakBook();
				break;
			case 5:
				stopSpeech();
				break;
			case 6:
// ensuring all threads are going finish
				bookReadToScreen.setStopRead(true);
				bookReadSpeech.setStopSpeech(true);
				System.out.println("Quitting...");
				break;
			default:
				System.out.println("Try options again...");
			}
		} while (option != 6);
		scanner.close();
	}

	public static void readBookFile() {
		try {
			FileReader fr = new FileReader(new File("Dracula.txt"));
			BufferedReader br = new BufferedReader(fr);
// read the first line.
			String line = br.readLine();
			while (line != null) {
				wholeText.add(line);
				line = br.readLine();
			}
			fr.close();
			br.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void readBookToScreen() {
		bookReadToScreen.setStopRead(false);
		Thread readToScreenThread = new Thread(bookReadToScreen);
		readToScreenThread.start();
	}

	public static void stopRead() {
		System.out.println("Going to stop the read");
		bookReadToScreen.setStopRead(true);
	}

	public static void speakBook() {
		bookReadSpeech.setStopSpeech(false);
		Thread speakTheBook = new Thread(bookReadSpeech);
		speakTheBook.start();
	}

	public static void stopSpeech() {
		System.out.println("Going stop speech");
		bookReadSpeech.setStopSpeech(true);
	}
}

package draculatext;

public class BookReadToScreen implements Runnable {
	private boolean stopRead = false;

	@Override
	public void run() {
		displayTextLineByLine();
	}

	private void displayTextLineByLine() {
		while (!Start.wholeText.isEmpty()) {
			System.out.println(Start.wholeText.remove());
// check if need to stop
			if (stopRead) {
				System.out.println("Stopping read to screen ..");
				return;
			}
			try {
				Thread.currentThread().sleep(1000);
			} catch (InterruptedException e) {
// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	/**
	 * @param stopRead the stopRead to set
	 */
	public void setStopRead(boolean stopRead) {
		this.stopRead = stopRead;
	}
}

package draculatext;

import com.sun.speech.freetts.Voice;
import com.sun.speech.freetts.VoiceManager;

public class BookReadSpeech implements Runnable {
	private boolean stopSpeech = false;

	@Override
	public void run() {
		Voice voice;// Creating object of Voice class
		voice = VoiceManager.getInstance().getVoice("kevin");// Getting voice
		if (voice != null) {
			voice.allocate();// Allocating Voice
		}
		try {
			voice.setRate(140);// Setting the rate of the voice
			voice.setPitch(70);// Setting the Pitch of the voice
			voice.setVolume(1);// Setting the volume of the voice
			while (!Start.wholeText.isEmpty()) {
				voice.speak(Start.wholeText.remove());
				if (stopSpeech) {
					System.out.println("Going stop speaking");
					return;
				}
			}
		} catch (Exception e) {
		}
	}

	/**
	 * @param stopSpeech the stopSpeech to set
	 */
	public void setStopSpeech(boolean stopSpeech) {
		this.stopSpeech = stopSpeech;
	}
}

 think all the code is fine and I have added freets.jar and freets-jsapi10.jar to my build path, but everytime i attempt to run the text to speech an error NoClassDefFoundError is thrown. console with error: https://i.stack.imgur.com/Ruhtc.png

Any help would be much appreciated. Thanks :)