I cannot get my binary search tree to grow when i call my insert method

I have three classes BSTNode,BinarySearchTree, and BinaryTreeTester

 all i have to do is implement the insert(int x,BSTNode t) and i'm good. However this has become a nightmare! I have traced through all my code and can see what is going wrong, however i have been unable to fix the problem. I'm desperate and am going to put this thread at 500 points. So big guys objects cehj we have discussed this many times please help!! Ok here are the two importantr classes ill post vbinary search tree first and then below this i'll post the tester with the output to the side . In a nutshel when i call insert the first time it sets root up just fine. but all following calls cause unexpected results look at binary test to see.

=======================================

public void insert(int x)
 {
    root = insert(x,root);
    System.out.println("insert(int x)");
 }


 public BSTNode insert(int x, BSTNode t)
 {
       if(t == null)
       {
            System.out.println("root");
          return  root = new BSTNode(x,null,null);
     }

      else if(x < t.getData())
      {
            if(t.leftChild == null)
            {
                  t.leftChild = new BSTNode(x,null,null);
                  System.out.println("left child null");
                  printTree();

            }
            else
            {
            t.leftChild = insert(x,t.leftChild);
            System.out.println("left");
        }
    }

      else if( x > t.getData() )
      {
            if(t.rightChild == null)
            {
                  System.out.println("right child null");
                  t.rightChild = new BSTNode(x,null,null);
                                      printTree();
            }
            else
            {
             t.rightChild = insert(x,t.rightChild);


                System.out.println("right");
        }
    }
  else
  ; //do nothing

System.out.println("returning t");
       return t;


 }





======================================

class BinaryTreeTester
{
  public static void main(String [] args)
  {

     BinarySearchTree tree = new BinarySearchTree();

     tree.insert(5);                                          calls insert(int k)
     System.out.println(tree.height() + " height test"); height of 1
     System.out.println(tree.root.getData() + "data");  data is 5
     System.out.println(tree.root);                               //is not null good.............

     System.out.println("");

     tree.insert(4);                                    calls insert(int k) this calls insert(x,root)  it goes into the second insert method and ends up in the if(t.leftChild == null) statement and places it ok i print the tree within the binary search tree class i get 5 4 it worked    however in the tester class tree.root.leftchild is null? why?    
     System.out.println(tree.height() + " height test");
     System.out.println(tree.root.getData() + "data");
     System.out.println(tree.root.leftChild + "left child");  this is null

     System.out.println("");

     tree.insert(66);              this does same thing is called by insert(int k) then called by insert(int x,bstnode t) then goes into the if (t.rightycild == null) and if i call print tree in the binary search tree class i get 5 root, 66 rightchild ........... 4 is gone?
     System.out.println(tree.height() + " height test");
     System.out.println(tree.root.getData() + "data");
     System.out.println(tree.root.rightChild + "right child"); once again now in the tester class rightchild is null?

      System.out.println("");

     tree.insert(3);  //allthe same i get 5 3 for tree if calle in the binarysearch tree with a printtree method but in the tester nothing
     System.out.println(tree.height() + " height test");
     System.out.println(tree.root.getData() + "data");

       System.out.println("========PRINT TREE============");
     tree.printTree();  then i call print tree in the tester i get 5 ??



  }//end main




 }//end


It must be with the childs == null statements and somehow assignments are lost when i call from another class i just cant get this.

500 POINTS AND A BIG HUG & KISS TO ANY WHO CAN HELP ME PLEASE