database auto-commit

hi

i writing a j2ee application working with postgresql and i meet a problem with autocommit
from my j2ee application i call a perl function and i get an error :
in french : Les Large Objects ne devraient pas être utilisés en mode auto-commit.
in english : Large Objects should not be used in mode auto-committed.

and i didn't find how to disable autocommit.

Thanks in advance

    William

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