> But I never close the AC-Connection. Without any commit.
> Is it possible that I run into problems without commiting the
> read connection?

Ok, then this is a problem. When you do not commit a transaction, you
won't see changes made by transactions that were started and committed
later. In other aspects, when you set the connection read-only
(Connection.setReadOnly) it has no consequences on the database.

So, if you can't add Connection.commit to your code, then you have to
have to work as you did it so far.

Roman