java - JTree: Missing link between TreeNode and TreePath -

i have problem described here.

i have invertexpand method in mytree class works this:

public void invertexpand(defaultmutabletreenode node) {     treepath path = new treepath(node.getpath()); // no better way treepath treenode :(     if (!isexpanded(path)) {         expandpath(path);     } else {         collapsepath(path);     } } 

but problem isexpanded() method uses hashmap store expanded paths. seems isexpanded() never returns true newly created treepath. (but expanded really)

does way fix issue?

expand/collapse works on non-leaf nodes, sure node in question not leaf:

public void invertexpand(defaultmutabletreenode node) {     if (node.isleaf())          node = (defaultmutabletreenode) node.getparent();     treepath path = new treepath(node.getpath()); // no better way treepath treenode :(     if (isexpanded(path)) {         collapsepath(path);     } else {         expandpath(path);     } } 

edit (as per op's comment)

the real reason misbehaviour incorrectly implemented hascode in custom node confused map (where expanded paths stored).