MIG-7: MSSQL NTEXT Migrator unsupported type.
It all depends on which SQL Server JDBC driver you use.
We found out that by using jtds jdbc driver there are no issues.
This issue is only with MSSQL jdbc driver 4.0.

Why exception?
With MSSQL jdbc driver 4.0 driver, Migrator identifies the NTEXT
type code as -16 with 1073741823 length/size fails to find the corresponding
type mapping in NuoDB Dialect.

Fix:
Add the jdbc type alias mapping between 'ntext' and 'clob' with type code -16.