Spring boot reactive (Webflux) with MySql

Actually there isn't any reactive support for relational database. But not for long time since the Spring Data team is working on R2DBC, which will provide the ability to access data reactively from a relational database. Stay tuned here: https://github.com/r2dbc

EDIT

The first release is out, see here for more details: https://github.com/r2dbc/r2dbc-postgresql/tags