Working with ADF Tree/TreeTable : javax.faces.model.NoRowAvailableException / How to expand all the nodes in ADF Tree/TreeTable without iterating

U got this issue while working with trees in ADF? Then, you are at the right place.

You get this issue if your tree model has changed and you try to refresh the tree/tree table.
It is because, the tree has lost its state. (u might have expanded some rows/collapsed some rows)

So, when u search again and change the tree model, it is trying to disclose the earlier rows which aren't there anymore.

When u have searched for this, many of the bloggers would have suggested to do this::

<treebinding>.getDisclosedRowKeys().clear();

This will work if you are OK with seeing all the rows collapsed.

I wanted something different, where in I wanted all the rows to be expanded (init expand) on refresh of the tree model.

Solution : 

                RowKeySet rks = new RowKeySetTreeImpl(true);
                rks.setCollectionModel(<treemodel/childpropertytreemodel>); [Something which is there in the value property of the tree]
                <treebinding>.setDisclosedRowKeys(rks);


So, after this I also found out that this solution will work for another question too.
How to expand all the nodes in an af:tree/af:treeTable?

Instead of iterating through nodes, forming keys and setting the disclosedRowKeys, this same solution would work for this as well like a charm.