pg74 --> SET AUTOCOMMIT TO OFF is no longer supported

Hi people!
 I have a problem when save() a object and i
autocommit to false. The error is "SET AUTOCOMMIT TO
OFF is no longer supported" I am working with
postgresql 7.4 from tarball, j2ee 1.4.2 and postgresql
jdbc driver is pg74jdbc3.jar.

I read in this forum that i can have problems with
versions, but i try change de postgresql driver
version and i get the same error.

Any ideas??

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