You can pass a ResultSet to the jsp with any method i.e.
public ResultSet getResultSet() throws SQLException
However the jsp will have to close the connection. ResultSets can't be returned from EJBs either. RowSets don't have this problem.
You can also use my ResultSetConverter object that converts a ResultSet to a 2 dim array (Object[][]). This also is detached from the db connection and so you don't have to close it. See this and more at
http://www.fdsapi.com. The FormattedDataSet also has methods to convert a ResultSet into HTML with very little code.