UCanAccess currently does not work with Spring Boot. The UCanAccess development team has been working on a Hibernate dialect for UCanAccess but it has not been released yet. Furthermore, it is unclear as to whether UCanAccess could work with Spring Boot without specific support from Spring Boot itself, and such support seems unlikely.
UCanAccess strives to support the Microsoft Access SQL syntax, which is somewhat similar to the T-SQL syntax used by SQL Server. Some users have been able to get Hibernate et al. sort-of-working with UCanAccess by using a SQL Server dialect for Hibernate, but that is not 100% compatible with Access SQL.
Of course, if you want to use plain JDBC then that would be the most compatible approach. See the code sample in this answer for simple example.