Grails 3.x is based on Spring Boot comes with out-of-the-box integration for Flyway.

All you need to do is add flyway-core to your build.gradle:

implementation "org.flywaydb:flyway-core:11.15.0"

Spring Boot will then automatically autowire Flyway with its DataSource and invoke it on startup.

You can then configure a good number of Flyway properties directly from your application.properties or application.yml file.