mybatis-3.5.17

Bugs:

• VendorDatabaseIdProvider#getDatabaseId() should return product name when properties is empty #3297
• Update NClobTypeHandler to use methods for national character set #3298

Enhancements:

• Allow DefaultSqlSessionFactory to provide a custom SqlSession #3128

There also are many pull requests for document updates and code improvements!
Please see the full changelog: mybatis-3.5.16...mybatis-3.5.17