You will get the message getNextException if you use the batch mode. Batch mode is only available for only insert oder update - no mix is allowed. It is not helpful to derecrease the commit size. I would disable the batch mode and try to find the error and if everything runs fine enable the batch mode. If you don't use the batch mode and switch off die on error you will get a new output flow (rejects) the your database output component. This reject output flow provides the exception message for every failed data set.
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