Advice monitoring transactions

Hi all, I'm writing an application which access an IDS 9.31 database, using Java/JDBC. I'm hoping someone can give me some advice on monitoring my transactions and in particular looking out for potential long transactions and the nightmares this can cause :-). Up until now the app in question has been read-only running at the lowest transaction isolation level so this hasn't been much of a problem, but now I'm performing updates as well so have had to bump up the isolation and start worrying more :-). Obviously I'm being religous about closing resultsets and commit()ing, but we all make mistakes :*). I'd like to be able to monitor what transactions my application has open pending commit/rollback at any given time (and as a side note what locks it may be holding as well.) I'm using onstat (-x etc.) as best I can to work out what's going on, but was wondering if there were any other tools out there that may be a little easier to fathom, or even if not, if there were any tips/tricks/advice I might benefit from! Thanks in advance, Tim.