ResultSets Closing, cant use .last() etc

Question

I am filling 3 seperate resultsets using 3 seperate sql queries.
The 1st query calls the connection classes setData() and passes in the sql statement, which connects, gets the data, puts it in a resultset, and returns it to the calling class. Then, the returned resultset copied into resultset1.
The 2nd query then does the same thing, but its sql statement is getting different data from a different table, but it still uses the getData() method to do it. It then fills resultset2.
Then the 3rd query runs its sql query the same way to fill resultset3.
The problem is, after i have filled resultsets 1, 2 and 3, it wont let me call a .first() or .last() on any of them cause it says that the resultset is closed! Heres the exact error msg:
"java.sql.SQLException: Operation not allowed after ResultSet closed"
Heres the code where i try fill the 3 resultsets:
          mycon = new MysqlConnect();
               details_res = mycon.getData("SELECT * FROM details ORDER BY details_id");     
               details_res.last();
               parts_res = mycon.getData("SELECT * FROM parts ORDER BY parts_id");               
               parts_res.last();
               costs_res = mycon.getData("SELECT * FROM costs ORDER BY costs_id");
               costs_res.last();'mycon' is an object of the connection class.
So im guessing that ive got a problem in the getData() method of the connection class so heres the code for that method:
     public ResultSet getData(String query)
          connect();
          try
               // browseable in all directions, not sensitive to updates by other users, not updateable
               stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); // create empty SQL statement
               // execute SQL query & store results
               result = stmt.executeQuery(query);
               con.close();        // close connection
               System.out.println("Data Retrieved. Connection Closed");
          catch (SQLException e)
               System.out.println("SQL Exception " + e);
          return result; // return the data
     }//end getData()'stmt' and 'con' are both declared at the top, private variables.

Answer 1

Right. Exactly. This is the way it's supposed to be. You've got major fundamental flaws in your approach.
First, the result set is not being copied, you're creating a new reference to it.
Second, result sets AREN'T copied.
Third, a ResultSet represents an arbitrarily large flow of data that will come throw the connection as you step through elements in the ResultSet; as soon as you close the connection, you cut off the flow.
So the excpetion is exactly right, you've closed the flow and therefore can't move around in the ResultSet.