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Issue with SaveorUpdate method in hibernate

Ram Manohar
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i am facing the issue while saving the POJO using saveOrUpdate() method in hibernate session.
issue facing when iam using generator class as sequence and id column data type is Integer.but if use data type is String it is working fine,
what i observed is that integer default value is is always trying to update the record instead of executing insert query and it is not executing sequence.
but if i take data type is String then default value is null that's why it is generating id by executing sequence so it is saving the record.

Please suggest me the solution ASAP
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