Working with hibernate 5.0.2 (starting with 5.0.0) i noticed a problem using a NVARCHAR column in a sqlQuery.
Even a simple "select * from table" gives "org.hibernate.MappingException: No Dialect mapping for JDBC type: -9".
The problem arises only when using jdbc driver from microsoft (v4.2 on java 8). Using jtds-1.3.1 the problem disappears.
The fact is that sqljdbc42.jar driver from Microsoft reports a column type -9 (that is NVARCHAR in java.sql.Types), while jtds-1.3.1 reports a value of 12 (that is VARCHAR).
I solved this adding to custom dialect:
registerHibernateType(Types.NVARCHAR, StringNVarcharType.INSTANCE.getName()); (maybe this simple fix is enough to fix sqlserver-dialects)
I also see that a similar bug is already posted for Oracle dialect at https://hibernate.atlassian.net/browse/HHH-9750
Pardon me for duping that.. I just dupe that to give more details and a test case (eclipse project without libraries to save space..)
Hibernate 5.0.2, Java 8, Microsoft Sql Server 2012 (or 2008), sqljdbc4.2 driver from microsoft, jtds-1.3.1 driver from sourceforge