Database & Oracle Reports 10g - passing large param lists

This may be more of an application architecture or design question, and it's
certainly an Reports 10g question; I'll just toss it out and you be the
judge :)

The environment: J2EE application, session management, etc.  10g back-end.
User can pull up a list with potentially thousands or tens of thousands of
records, paginated of course.  They can arbitrarily flag or unflag records
on this list at will, either one at a time with checkboxes, or by applying a
variety of filters.  The list of "flagged" records is maintained at the
session level in the middle tier.  The user clicks a button and Reports 10g
is invoked to generate a mongo PDF for only those records which are flagged.
The flags needn't be stored in the back-end, there is no need to persist
them.  At least, that's the idea.

The problem: at the session level, user might end up flagging tens of
thousands of records.  How can I pass this to Reports so that it knows which
records to include in its report?  It can't be a URL parameter, of course.
One solution is to have the middle tier dump a list of these flagged records
into the database (a temp table, perhaps), where Reports 10g can get at 'em.
Unfortunately then I'm incurring some overhead on the back-end *and* I'm
faced with potentially millions of records of DML per day just for using the
database as a temporary scratchpad.

Is there a way to stream or send a large result set from J2EE to Reports 10g
directly without using the RDBMS as an intermediary?  Minimally we're
talking about tens of thousands IDs, each potentially 15 characters long.

Bob

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