PersonTree tree = new PersonTree();
tree.SetRoot(parent);
ODocument child = tree.AddChild(parent, newName, newIdentifier.toString());
buildTree(tree, child.getIdentity(), newName, subnodes, depth - 1, startLetter);
db.commit();
break;
} catch (ONeedRetryException e) {
System.out.println("Concurrency change, retry " + i);
} catch (Exception ex) {