DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient);
if (rangeKey != null)
mapper.load(persistentClass, hashKey.toString(), rangeKey.toString());
else
mapper.load(persistentClass, hashKey.toString());
mapper.save(obj);
}
else
throw new GoraException("Error while retrieving keys from object: " + obj.toString());
}catch(NullPointerException npe){
LOG.error("Error while putting an item. " + npe.toString());