Question

I have a JTree (myTree) and in another class, I have a DefaultMutableTreeNode which was taken from myTree.

In a certain function, I want the JTree to highlight the node.

I tried:

myTree.setSelectionPath(new TreePath(treeNode));

but visually nothing is happening.

any ideas?

UPDATE:

I have also another JTable which is rendered based on the selected treeNode in myTree. The table is updating correctly. It’s just the myTree which refused to update visually.

Answer 1

You need to use the actual tree path of the node. Not just an instance of TreePath:

myTree.setSelectionPath(new TreePath(treeModel.getPathToRoot(treeNode)));

Also, the javadoc says:

If any component of the path is hidden (under a collapsed node), and getExpandsSelectedPaths is true it is exposed (made viewable)

So make sure that getExpandsSelectedPaths is true.