Data communication b/w different panels!!!

Question

I have two different panels CFtree and CMyTab and I am trying to call a function of CFtree from CMyTab
//+++++++++++++++++++++++++++++
//CFtree code...
// Generating only one object of this class like
public class CFTree extends JTree implements ActionListener {
private static CFTree objFeatureTree = null;
public static CFTree createObject() {
if (objFeatureTree == null) {
objFeatureTree = new CFTree();
return objFeatureTree;
return objFeatureTree;
* Get object of CFTree
* @return CFTree
public static CFTree getObject() {
return objFeatureTree;
public void dummy(){
System.out.println("Feature tree function called");
// CMyTab pseudo-code..
public class CMyTab
extends JPanel {
CFTree mFtrTree = CFTree.getObject(); // calling to get current object of CFTree
// and function acess like
mFtrTree.dummy();
As soon as mFtrTree.dummy() is called, following exception is thrown:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
What can be the reason for this? How can I specify in CMyTab that it is going to call a function placed in a different panel CFTree. What are the way to tackle this problem?
Please comment!
Thanks,
rdh

Answer 1

In the following statement, please replace "getObject" with "createObject":
CFTree mFtrTree = CFTree.getObject(); // calling to get current object of CFTree