GetSelectionPaths() in a separate TreeSelectionListener-Method

Question

I've define a JTree-Class with the Attribute "JTree jtree".
like this:
public class XY implements ActionListener{
     JTree tree=null;     
Furthermore in a method addSelectionListener() in this class I add a TreeSelectionListener.
If now a SelectionEvent occurs the code branch in the valuChanged-Method of
the SelectionListener. There I try to get the selected items by "tree.getSelectionPaths()".
And olthough I had selected some items the result I got is null.
But if I define the addSelectonListener() in this way: addSelectonListener(jtree) it works.
Why this ??
Any ideas?
incs

Answer 1

Hi Josh,
I've tryed to separate my problem. Following the extract. Now the problem seems to be reduced to the effect to assign the selection listener to only one tree-instance, videlicet for the tree that was instantiated at last.
public class JTreeSel
extends JFrame
DefaultTreeModel treeModel=null;
DefaultMutableTreeNode root=null;
DefaultMutableTreeNode treeNode=null;
JTree tree,vinTree,proNotree=null;
public JTreeSel(){
public void generateTree(){
JTabbedPane tp = new JTabbedPane();
root = new DefaultMutableTreeNode("root");
root.add(new DefaultMutableTreeNode("one"));
root.add(new DefaultMutableTreeNode("two"));
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
tree.setRootVisible(true);
this.addSelectionListener();
tp.add(tree);
root = new DefaultMutableTreeNode("root2");
root.add(new DefaultMutableTreeNode("one2"));
root.add(new DefaultMutableTreeNode("two2"));
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
tree.setRootVisible(true);
this.addSelectionListener();
tp.add(tree);
this.getContentPane().add(tp);
public void addSelectionListener(){
tree.addTreeSelectionListener(
new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent event){
TreePath[] selections = tree.getSelectionPaths();
TreePath tp = event.getNewLeadSelectionPath();
if (tp!=null && tp.getLastPathComponent().toString()!=null && ((DefaultMutableTreeNode)
tp.getLastPathComponent()).isLeaf()){
if (selections != null) {
for (int i = 0; i < selections.length; i++) {
TreePath selectedProdSet = selections;
System.out.println("SelektierterTreePath[]: " + selectedProdSet.toString());
} else {
System.out.println(" no leaf element selected");