> documentation rant. They cover the simple cases and leave you in the dark if you need to do anything more complex The business model for Apache Groovy and Gr

> documentation rant. They cover the simple cases and leave you in the dark if you need to do anything more complex The business model for Apache Groovy and Grails after Groovy creator James Strachan was pushed out became to hook users in with free open source software, then charge them for consulting and conferences when they'd amassed some technical debt. > The recommended upgrade path from 2 to 3 is "start a new project and copy over your files Virtually no-one's upgrading from Grails 2 to 3, or even starting new projects in version 3.