OCI, the new Grails home, summarizes what’s new in this release:
- Grails 3.1 comes with Spring Boot 1.3 and Spring 4.2, enabling you to produce runnable JAR files that embed Tomcat, Jetty or other containers. In addition you can use Spring Cloud with Grails 3.1 to build Cloud Native applications.
- Grails 3.1 features new support for expandable application profiles, allowing developers to build application creation templates that target a range of different tasks.
- Grails 3.1 features new profiles for building REST applications and Single Page Applications (SPA) using AngularJS. The REST profile features a focused environment that helps developers quickly spin-up REST servers, easily deployable either standalone or to modern Java application servers.
- The new AngularJS profile in Grails 3.1 helps developers quickly become productive building Single Page Applications (SPA) using AngularJS. By integrating seamlessly with tools such as Bower and Karma, the AngularJS profile provides everything you need to build, run and deploy AngularJS applications backed by Grails.
- Grails 3.1 comes with GORM 5, a ground-up rewrite of the innovative data access framework that comes with Grails. Featuring new support for the graph database Neo4j, as well as enhanced support for MongoDB 3 and Hibernate 5, GORM 5 provides all the tools necessary to integrate modern backend applications with your database.
The latest Grails documentation also has a What’s new in Grails 3.1 section.
Upgrading from a Grails 3.0 application or plugin generally requires just an version update to
gradle.properties but there might be some manual things to do as described in the Upgrading from Grails 3.0 section.