How to use CachedRowSet?

I want to read the results of the query in pages and try to use OracleCachedRowSet for this purpose.
this code example I found in the documentation to the Interface CachedRowSet of J5SE API:
crs.setPageSize(100);
crs.execute(conHandle);
while(crs.next() {
. . . // operate on first chunk of 100 rows in crs, row by row
while(crs.nextPage()) {  // ERROR!!!
while(crs.next()) {
. . . // operate on the subsequent chunks (of 100 rows each) in crs,
// row by row
if I use this code example, I get an exception with message "Closed ResultSet" at the line where I call crs.nextPage():
Exception in thread "main" java.sql.SQLException: Geschlossene Ergebnismenge: getMetaData
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
     at oracle.jdbc.driver.OracleResultSetImpl.getMetaData(OracleResultSetImpl.java:124)
     at oracle.jdbc.rowset.OracleCachedRowSet.populate(OracleCachedRowSet.java:1881)
     at oracle.jdbc.rowset.OracleCachedRowSet.nextPage(OracleCachedRowSet.java:7617)
     at test.TestRowSet.main(TestRowSet.java:31)
what I do wrong?
Thanks.

sorry grif i didn't get you. Please can you explain
more briefly.
Exact Scenario is i have a dropdown for blood group
and it is one of the column in cachedrowset. but i
dont have another cachedrowset for selecting the
bloodgroup like a+,b+,o+ etc. Simply i want to
display all the above said feilds in that dropdown,
but whenever i select the particular one it must be
submitted. I hope you understand this time more
clearly.Roman is correct in his response.
You can either use an Options array as shown in http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/listbox_components.html or you can use the default options like you did when you completed getting started tutorial (see http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/jscintro.html#03)
You bind the drop down list to your options and you bind the table column to the data provider column. This is very similar to what is done with trip type in http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/inserts_updates_deletes.html except that you use the Options array instead of another data provider.

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