How to set setRowKey value when table is populated dynamically

Hi All
I have created a view object using only select statement and displaying all the records in it in the table at page load. Table is SelectMany. Now after selecting some records I press submit button. At the backend logic is executed which prints how many rows selected and the values of the selected rows. Everything works fine till here.
Now when the view object is modified by putting where clause. And the parameter to this where clause is coming from url. When the page is loaded table displays only records based on filter criteria. But the problem begins when I press the submit button. It shows the error: row is null for rowKey:oracle.jbo.Key[AAAQkHAAJAAAACkAAA ]
I have done some research and found that row key is not set for the displayed records. because at the backend when I am printing the values of keys in selectionState.KeySet it prints only null.
This thing happens only when table is populated dynamically through url value.
Can anyone help me how to get the selectionState.Keyset values when table is populated dynamically?

SOLVED:
Actually there is no problem with the rowKeys as I mentioned in the post. What happened was that I was executing the query everytime on page load. Second time when the page is loaded the param value was set to null. So row becomes null but on the other hand I am referring the rows by some selected row keys. so the error that row is null for key...
So now i am storing the param value in managed bean and then referring it in the code.

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