🚀 go-pugleaf

In the following code I set a TreeModel:

      viewTree = new JTree(root);
      mdl = new ViewTreeModel(st, path);
      viewTree.setModel(mdl);

This compiles, but on running it I get ClassCastException. This occurs
in JTree.setModel() when it calls the method firePopertyChange(), which
in turn is trying to execute the getChildren() method in my TreeModel
interface.

getChildren() accepts an Object, and in my implementation I cast it to
ContextObject - my own construct - and send it off to a method in a
class that knows how to get children. It is on this cast that I get the
run time exception.

The question is, why is setModel() [ via firePropertyChange() ] calling
anything in my TreeModel interface?

The second question is, since this is how it works, what do I do about
it? 

-- 
Leo Cohen

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lcohen@cs.virginia.edu