Re: how to resolve org.postgresql.util.PSQLException: ResultSet not positioned properly, perhaps you need to call next.

> As I said last time, I'm not an "expert".
> 
> subjectNames is declared as an array.
> In your "for" loop you will be doing ps2.setArray(2, array); multiple
> times depending on the number of subjects contained in subjectNames.
> 
> I suspect the query is failing and as there is no try .. catch block to
> trap the SQLException, this is not reported back to your code.
> 
> If you alter the postgresql.conf to log all SQL statements, restart,
> run your test again, look in the log file, it will show the passed
> parameter values. You can then verify that that the array passed as the
> second parameter is correct.
> 
> HTH,
> Robert
Relieved am I that other’s could see that I was not doubting the OP wrote the code in question.  I do consider myself a Java programmer (expert is a trickier question).

We do need to see the entire routine (I think that might be doPost()).  If that’s more than 100 lines I suggest a refactor first. Have the doPost() call a method which does nothing but the desired interaction.