Cannot use pointer on FilterRowSet?

Question

I'm trying to use FilterRowSet to filter the appropriate values from database query. This is my code:

// Initialize
FilteredRowSet rowset = new FilteredRowSetImpl();

// Set the query string
rowset.setCommand("SELECT * FROM student");
rowset.setUrl("jdbc:mysql://127.0.0.1/test");
rowset.setUsername("root");
rowset.setPassword("");

// Execute to get a result set
rowset.execute();

System.out.println(rowset.first()); // Output: true
rowset.setFilter(new MyStringFilter("matcher", "column_name")); // Add condition to my filter rowset
System.out.println(rowset.first()); // Output: false

The problem is my rowset's pointer cannot be set after I set the filter condition, which is making it impossible to parse through it (or something similar) at later point of time.

Is this a bug or something that I am not aware of, when using the FilteredRowSet class?