-79747 Invalid transaction isolation level

Explanation
If the database server could not complete the rollback,
this error occurs. See the rest of the SQLException message
for more details about why the rollback failed.
This error also
occurs if an invalid transaction level is passed to setTransactionIsolation().
The valid values are:TRANSACTION_NONE
TRANSACTION_READ_UNCOMMITTED 
TRANSACTION_READ_COMMITTED 
TRANSACTION_REPEATABLE_READ 
TRANSACTION_SERIALIZABLE 
TRANSACTION_LAST_COMMITTED