Based on the steady stream of questions about ancient grails (2.5.6 and earlier), a good upgrade guide--and if possible scripts too--to help upgrade from from 2.x to 7.x (when it is out) sounds like it would be really beneficial to the community.

Grails 2.3 does have an upgrade script for this, but it was removed in the later versions, same as install-plugin and uninstall-plugin.it will be good for developers to upgrade the legacy applications and plugins. We could automate more of the process. But it will be a lot of work to write the big Groovy script including all of the version’s differences.

Getting to 2.5.6 from earlier versions was a pretty reasonable process, at least compared to upgrading from there. So, I personally think targetting 2.5.6 to 7.x would give many people/organizations “stuck” on earlier Grails an easier path--even if they neeed to get to 2.5.6 (or close to it) first. I know @sbglasius and @Dónal have shared some (now pretty old) scripts to at least help with the 2.x to 3.x process in the past. While I don’t personally have the time, I’d be willing to kick in some funding toward this.

While I have not recently used my scripts, I think they are still worth looking at.

@gene Why did your project still choose to use version 2.5.6, what prevented it from upgrading to 3.0 or higher version?