Invalid column type: getBigDecimal not implemented for class oracle.jdbc.driver.T4CDateAccessor in adf

Error -
Invalid column type: getBigDecimal not implemented for class oracle.jdbc.driver.T4CDateAccessor in adf

Possible similar errors-
Invalid column type: getString not implemented for class oracle.jdbc.driver.T4CBlobAccessor
Invalid column type: getInt not implemented for class oracle.jdbc.driver.T4CRowidAccessor

Reason -
 This type of error will come when you will update your existing query by adding some extra columns

Solution -
The error because newly added columns came in the attribute list and in your java impl files,but they went off from your query.
So go the source of your VO.xml and added those newly added columns their again and run again you won't get that error again.