Why Are My AVL Tree Nodes Disappearing During Insertion?

[STEMucator]

So I'm trying to construct an AVLTree and something crazy seems to be happening in my code.

AVL Tree Class. This includes only the insert and delete methods, soon to be a find method as well :

package comp2402TreeEditor;

public class AVLTree extends BSTree {  
	
	public AVLTree() {}
	
    public void insert(String dataString){
	   	Data data = new Data(dataString);
	   	
	   	AVLTreeNode newChildNode = new AVLTreeNode(data);

	   	if(isEmpty()) {
	   		setRoot(newChildNode);
	   		newChildNode.setLocation(getOwner().getDefaultRootLocation());
	   	}
	   	
	   	else
	   		getRoot().insertNode(newChildNode);
    }
	
    public void remove(String aKeyString){
    	if(isEmpty()) return;
        
    	if(size()==1){
    		Data temp = new Data(aKeyString);
    		if(root().getData().compare(temp) == 0)
    			setRoot(null);
    		return;
        }
     
        getRoot().remove(aKeyString);   
    }
	
}

Now as for the real problem, here's my AVLTreeNode Class. I'm focusing mainly on the insertion portion right now :

package comp2402TreeEditor;

import java.awt.Point;

public class AVLTreeNode extends BSTreeNode{

	int balance;
	
	public AVLTreeNode() {}

	public AVLTreeNode(Point aPoint) {
		super(aPoint);
		balance = 0;
	}
	
	public AVLTreeNode(Data data) {
		super(data);
		balance = 0;
	}
	
	public void insertNode(TreeNode aNode) {
		if(!(aNode instanceof AVLTreeNode)) return;
		
		System.out.println(this);
		System.out.println(aNode);
		System.out.println(leftChild);
		System.out.println(rightChild);
		
		if(aNode.getData().compare(getData()) < 0) {
			if(leftChild == null) {
				leftChild = (AVLTreeNode) aNode;
		      	aNode.setParent(this);
	    		recursiveBalance(this);
		      	aNode.setLocation(this.getLocation()); //starting location for animation
			}
			else{
				leftChild.insertNode(aNode);
			}
		}
		
		else{
			if(rightChild == null) {
				rightChild = (AVLTreeNode) aNode;
	       	  	aNode.setParent(this);
	    		recursiveBalance(this);
	       	  	aNode.setLocation(this.getLocation()); //starting location for animation
			}
			else {
				rightChild.insertNode(aNode);
			}
		}
	}
	
	public void remove(String aDataString){			
		Data temp = new Data(aDataString);

		int comparision = temp.compare(this.getData());
			   
		if(comparision < 0 && leftChild != null) {
			leftChild.remove(aDataString);
		}
			   
		else if(comparision > 0 && rightChild != null) {
			rightChild.remove(aDataString);
		}
		
		else if(comparision == 0){
			//found a node to remove so remove this node
			if(isLeaf()) 
				getParent().removeChildNode(this);
			
			else if(isRoot() && rightChild == null) {
				//hijack the leftChild as the new root of the tree
				setData(leftChild.getData());
				leftChild.setParent(null);
				
				rightChild = (AVLTreeNode) leftChild.rightChild();
				if(rightChild != null) 
					rightChild.setParent(this);
				
				leftChild = (AVLTreeNode) leftChild.leftChild();
				if(leftChild != null) 
					leftChild.setParent(this);
			}
			
			else if(isRoot() && leftChild == null) {
				//hijack the right as the new root of the tree
				setData(rightChild.getData());
				rightChild.setParent(null);
				leftChild = (AVLTreeNode) rightChild.leftChild();
				if(leftChild != null) 
					leftChild.setParent(this);
				
				rightChild = (AVLTreeNode) rightChild.rightChild();
				if(rightChild != null) 
					rightChild.setParent(this);
			}
			
			else if(leftChild == null && rightChild != null) {
				//promote rightchild as new child of parent
				((AVLTreeNode) getParent()).replaceChildNode(this, rightChild);
			}
			else if(rightChild == null && leftChild != null) {
				//promote left child as new child of parent
				((AVLTreeNode) getParent()).replaceChildNode(this, leftChild);
			}
			else{
				//we need to remove an internal node with two current children
				//find the smallest next node via the right subtree and use it as a
				//replacement for this node
				
				TreeNode smallest = ((AVLTreeNode) rightChild).findSmallestNode();
				this.setData(smallest.getData()); //steel the data object of the smallest node
				smallest.remove(smallest.key());
				//System.out.println("BSTreeNode::remove: smallest to remove= " + smallest.key());
			}		
		}
	}
	
	public void recursiveBalance(AVLTreeNode current) {
		 setBalance(current);
		 int tBalance = current.balance;

		 System.out.println(current + " " + this);
		 System.out.println(tBalance);

		 if(tBalance == -2) {
			 if(height((AVLTreeNode)current.leftChild.leftChild) >= height((AVLTreeNode)current.leftChild.rightChild))
				 current = rotateRight(current);
			 else
				 current = doubleRotateLeftRight(current);
		 }  
		 if(tBalance == 2) {
			 if(height((AVLTreeNode)current.rightChild.rightChild) >= height((AVLTreeNode)current.rightChild.leftChild))
				 current = rotateLeft(current);
			 else
				 current = doubleRotateRightLeft(current);
		 }

		 if(current.getParent() != null) {
			 recursiveBalance((AVLTreeNode)current.getParent());
		 }
		 
		 else {
			 //Need to somehow set the root to be current RIGHT HERE!
			 System.out.println("Balancing Complete!");
		 }
	 }
	 
	 public AVLTreeNode rotateLeft(AVLTreeNode n) {
		 AVLTreeNode v = (AVLTreeNode)n.rightChild;
		 v.setParent(n.getParent());
		 n.rightChild = v.leftChild;
		 
		 if(n.rightChild != null)
			 n.rightChild.setParent(n);
	 
		  v.leftChild = n;
		  n.setParent(v);
	 
		  if(v.getParent() != null) {
			  if(((AVLTreeNode)v.getParent()).rightChild == n)
				  ((AVLTreeNode)v.getParent()).rightChild = v;
			  else if( ((AVLTreeNode)v.getParent()).leftChild == n)
				  ((AVLTreeNode)v.getParent()).leftChild = v;
		  }
	 
		  setBalance(n);
		  setBalance(v);
		  return v;
	 }
	 
	 public AVLTreeNode rotateRight(AVLTreeNode n) {
		 AVLTreeNode v = (AVLTreeNode)n.leftChild; //(3)
		 v.setParent(n.getParent()); //(null)
		 n.leftChild = v.rightChild; //(null)
		 
		 if(n.leftChild!=null)
			 n.leftChild.setParent(n);
	 
		  v.rightChild = n;
		  n.setParent(v);

		  if(v.getParent() != null) {
			  if(((AVLTreeNode)v.getParent()).rightChild == n)
				  ((AVLTreeNode)v.getParent()).rightChild = v;
			  else if( ((AVLTreeNode)v.getParent()).leftChild == n)
				  ((AVLTreeNode)v.getParent()).leftChild = v;
		  }
		  setBalance(n);
		  setBalance(v);
		  return v;
	 }

	 public AVLTreeNode doubleRotateLeftRight(AVLTreeNode u) {
		 u.leftChild = rotateLeft((AVLTreeNode)u.leftChild);
		 return rotateRight(u);
	 }

	 public AVLTreeNode doubleRotateRightLeft(AVLTreeNode u) {
		 u.rightChild = rotateRight((AVLTreeNode)u.rightChild);
		 return rotateLeft(u);
	 }

	 public AVLTreeNode successor(AVLTreeNode q) {
		 if(q.rightChild != null) {
			 AVLTreeNode r = (AVLTreeNode)q.rightChild;
			 while(r.leftChild != null)
				 r = (AVLTreeNode)r.leftChild;
			 return r;
		 } 
		  
		 else {
			 AVLTreeNode p = (AVLTreeNode)q.getParent();
			 while(p != null && q == p.rightChild) {
				 q = p;
				 p = (AVLTreeNode)q.getParent();
			 }
			 return p;
		 }
	 }

	 private int height(AVLTreeNode current) {
		 if(current == null)
			 return -1;
		 if(current.leftChild == null && current.rightChild == null)
			 return 0;
		 else if(current.leftChild == null)
			 return 1+height((AVLTreeNode)current.rightChild);
		 else if(current.rightChild == null)
			 return 1+height((AVLTreeNode)current.leftChild);
		 else
			 return 1+maximum(height((AVLTreeNode)current.leftChild),height((AVLTreeNode)current.rightChild));
	 }

	 private int maximum(int a, int b) {
		 return (a>=b) ? a : b;
	 }
	 
	 private void setBalance(AVLTreeNode current) {
		 current.balance = height((AVLTreeNode)current.rightChild) - height((AVLTreeNode)current.leftChild);
	 }
	 
	private void replaceChildNode(TreeNode currentChild, TreeNode newChild){
		//replace the currentChild of this node with the newChild node
		if(leftChild == currentChild){
			removeChildNode(currentChild);
			leftChild = (AVLTreeNode) newChild;
			newChild.setParent(this);
		}
		else if(rightChild == currentChild){
			removeChildNode(currentChild);
			rightChild = (AVLTreeNode) newChild;
			newChild.setParent(this);
		}
	}
	
	private TreeNode findSmallestNode(){
		//find the smallest node searching from this node along the left subtrees
		//in a binary search tree the node with the smallest key will be found by
		//going left as far as possible.
		
		if(leftChild == null) return this;
		else return ((AVLTreeNode) leftChild).findSmallestNode();
		
	}
}

Crazy things seem to happen when i try to create a tree by inserting 5, 3 and then 1. The 3 and 1 nodes disapear into nowhere and only the 5 node is left surviving ( which is absolutely incorrect ).

What should happen is that since 5 is my root, 3 is a left child and 1 is a left left child; I should see a re-arrangement of my tree to 3 1 5 where 3 is now the root, 1 is the left child and 5 is the right child.

For some reason this does not seem to be happening? If anyone can spot the kink please let me know as I've been at this for 3 days now and it's getting quite tiresome.

EDIT : Here's a picture of my gui and what's going on.

Picture of inserting 5 and then 3 : http://gyazo.com/6cf46d74404d5e49650a096b721f8b2a
Picture of inserting 1 right after : http://gyazo.com/2b04ee63e66991fbc93cc201fa981159