New technologies inside Grails 3
Grails 3 is a rewrite of Grails 2 and now is based on Spring Boot and not just on Spring MVC framework. The old build system (Gant scripts) are replaced with Gradle which is already used by Spring Boot. This migration has a downside - all the plugins have to be migrated to the new Grails 3 version. The good thing is that the most important plugins were already been migrated by the Grails community.