ClassCastException in Doubly Ended Queue using circular double linked list

Hi I'm trying to do my lab implementation/code for Doubly Ended Queue using circular double linked list the problem is that it throws ClassCastException in my deQueueRear() as i don't know what did i do wrong and i implemented the text books algothm for that method the QueueDoubleEnded:: package lab10_moudhi;

/**
 *
 * @author Moudhi
 */
public class QueueDoubleEnded<E> {
 //Nested Node inner-class:
 private static class Node<E> {
 private E data;
 private Node<E> next;
 private Node<E> prev;

 Node(E data, Node<E> next, Node<E> prev) {
 this.data = data;
 this.next = next;
 this.prev = prev;
 }//end of Node constructor
 E getData() { return data; }
 Node<E> getNext() { return next; }
 Node<E> getPrev() { return prev; }

 void setData(E data) { this.data = data; }
 void setNext(Node<E> next) { this.next = next; }
 void setPrev(Node<E> prev) { this.prev = prev; }

 public String toString(){return data+"";}
 }//end of Node class

 //Attributes
 private Node<E> front=null, rear=null;
 private int size=0;
 public QueueDoubleEnded() { }

 public boolean isEmpty(){return size==0;}
 public int size() {return size;}

 public Node<E> getFront() {
 if (isEmpty()) return null;
 return front;  
 }
 public Node<E> getRear() {
 if (isEmpty()) return null;
 return rear;
 }//end of getRear

 public void display(){
 if (isEmpty()) {
 System.out.println("\nERROR: Empty Queue!");
 return;
 }//end if

 System.out.print("\n********** Display Queue **************\n");

 Node<E> current=front;
 do{
 System.out.println(current.data);
 current=current.next;
 }while(current!=front);

 System.out.println("***************************************\n");
 }//end of display

 public void enQueueRear(E value){ //like addLast in a CDLL
 Node<E> newNode = new Node(value, null, null);

 if (isEmpty()){
 front = rear = newNode;
 newNode.next=front;
 newNode.prev=front;
 }
 else{
 newNode.prev=rear;
 rear.next=newNode;
 front.prev=newNode;
 newNode.next=front;
 rear = newNode;
 }//end if-else
 size++;
 System.out.println(value + " - Added to Queue (enQueueRear)");
 }//end of enQueueRear

 public Node<E> deQueueFront() { 
     if (isEmpty()) {
 System.out.println("\nERROR: Queue Underflow!");
 return null;
 }//end if

 Node<E> temp=front;
 front = front.next;
 rear.next=front;
 front.prev=rear;
 size--;
 if (size == 0) { rear =front = null; }

 System.out.println(temp.data + "- Deleted from Queue(deQueueFront)");
 return temp;
 }//end of deQueueFront

 //Lab 10 Tasks:
 public void enQueueFront(E value){ 
     System.out.println(value+" - Added to Queue (enQueueFront)");
    Node newNode=new Node(value,null,null);
    if (isEmpty()){
        front=newNode;
        rear=newNode;
    }else{
        front.prev=newNode;
        newNode.next=front;
        front=newNode;
    }
 size++;

 }
 public Node<E> deQueueRear() { 
if (isEmpty()){
    System.out.println(" Queue is underflow ");
    return null;
}
Node<E> temp = (Node<E>) rear.data;//throws the class cast exception here 
rear=rear.prev;
rear.next=null;
size--;
if(size==0) front=null;
return temp;
}

 }

The main class::

package lab10_moudhi;

/**
 *
 * @author Moudhi
 */
public class Lab10_moudhi {
    public static void main(String[] args) {
         System.out.println("Testing a Doubly Ended Queue using CDLL:");
         System.out.println("--------------------------------------------");
         QueueDoubleEnded q2= new QueueDoubleEnded();
         q2.enQueueFront(10);
         q2.enQueueFront(20);
         q2.enQueueFront(30);
         q2.enQueueFront(40);
        q2.enQueueRear(50);
        q2.enQueueRear(60);
        q2.deQueueFront();
        q2.deQueueRear();//throws error at this call for this method
         System.out.println("Front Element:"+q2.getFront());
            System.out.println("Rear Element:"+q2.getRear());
            q2.display();
          System.out.println("--------------------------------------------");   
    }

}

The error message ::

run:
Testing a Doubly Ended Queue using CDLL:
--------------------------------------------
10 - Added to Queue (enQueueFront)
20 - Added to Queue (enQueueFront)
30 - Added to Queue (enQueueFront)
40 - Added to Queue (enQueueFront)
50 - Added to Queue (enQueueRear)
60 - Added to Queue (enQueueRear)
40- Deleted from Queue(deQueueFront)
Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to lab10_moudhi.QueueDoubleEnded$Node
    at lab10_moudhi.QueueDoubleEnded.deQueueRear(QueueDoubleEnded.java:120)
    at lab10_moudhi.Lab10_moudhi.main(Lab10_moudhi.java:33)
C:\Users\Moudhi\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)