public void onExpandAll() {
TreeExpansionModel expansionModel = tree.getExpansionModel();
List<TreeNode> roots = getTreeModel().getRootnodes();
for (TreeNode root : roots) {
expandAll(root);
}
}
private void expandAll(TreeNode node) {
if (node.getHasChildren()) {
expansionModel.markExpanded(node);
for (TreeNode child : node.getChildren()) {
expandAll(child); // this is a recursive call
}
}
}
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