You can allow Cross Domain Ajax calls to an application by just registering a new filter and then configure it to Allow-Origin : {your domain's} or you can use a wild card "*" to allow the calls from all domains. You can even Define the Custom Headers your application supports by defining them in a comma separated format ,...
Springboot support is provided by most of the build tools e.g. Gradle and Maven. Though grails 3.x comes with Springboot and gradle integration, there might come scenarios where you just want to create a very small and simple build that does specific task e.g. a build that will just run some threads and trigger some rabbitmq messages. Now...