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Try switching to the ojdbc7 (instead of ojdbc6) jar, since it's a newer version that does not appear to have this problem.
You might have to edit your connection .properties file with a text editor to switch it from ojdbc6-11 to ojdbc7-12, then go into talend and "modify" it without changing anything, when you hit finish it will prompt to update all jobs that use it.
(FYI, the ojdbc7-12 driver is compatible with oracle 11g as well as 12c, probably 10g too, but I hope you aren't using that)