"Exausted resultSet" error in servlet calling SQLJ

Question

I've got a servlet wich calls a sqlj methode; the sqlj opens an iterator, converts it as a resultset, and sends it to the servlet.
Then, the servlet browses this ResultSet (with rs.next()) and output the data to screen.
I don't know why, but sometimes, all data appears on the screen, and sometimes i get an error message "Exausted resultSet", and sometimes i get an other error message "Closed ResultSet".
I use the same program, i just run it many times, and sometimes it crashes, and sometimes not. (and it don't crashe in the same moment)
i use Tomkat 3.2.1 with apache
where does this bug come from ? Tomkat or SQLj ??
i've notice that the error appears when the garbage collector runs. If i run it manualy in the "while(rs.next())", it crashes immediately
if i run the garbage collector before the "while" statement, for small resulset, it never crashes, but for bigger resultset it do ! (as if the problem appears when the garbage collector runs)
it causes big problems to continue developping our application, so any help would be very appreciated...

Answer 1

Are you using JDK 1.2.1? If yes, then try to use JDK 1.2.2 instead. We have seen JDK 1.2.1 garbage collecting things that are still in scope (very unsafe).
If wiggling your configuration does not help, you'll need to provide more info about your environment and it would be best to get a reproducible test case.
One other note: make sure to finally close the SQLJ iterator not the result set that is being returned. Otherwise you can start leaking cursor handles and/or statement cleanup will not be properly performed.