Is autocommit=true bad?

Greetings,
I've been tasked with maintaining a postgresql-7.3.4 database that has a
J2EE app on the front end.

In the pgsql log I see thousands upon thousands of entries like these:
WARNING: COMMIT: no transaction in progress

Through a little googling, I've determined it means that the folks who
wrote the J2EE app have set autocommit=true. I'm not, by any means, a
java programmer, so I'm not sure if setting autocommit=true serves any
useful purpose, other than not having to add BEGIN and END statements to
your code.

At any rate, are there any negative consequences to setting setting
autocommit=true, such as performance hits (and the obvios filling up
diskspace because of the logging)?

thanks!

--
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Lonni J Friedman netllama(at)linux-sxs(dot)org
Linux Step-by-step & TyGeMo http://netllama.ipfox.com