Timeouts on big queries with JDBC?

I'm doing some huge queries with a cursor and JDBC on Postgresql
7.4.2 It has been working pretty well so far but I've ramped my data
set up a bit and now I get these exceptions when iterating through the
results set:

org.postgresql.util.PSQLException: Connection is closed. Operation is
not permitted.

Is this a time out problem? Something else? There is about 10million
rows in the table I'm querying.

thanks,
Ian
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*Ian S. Nelson
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