Before upgrading, dot this:
- Delete any plugins you don't want to take with you into to the upgrade.
- If you are upgrading the acegi plugin you MUST DO THIS BEFORE YOU UPGRADE GRAILS, so just do that (instructions found here).
- Possibly (I don't know) you also need to upgrade any other plugins before upgrading grails.
If you don't follow these instructions there will be all kinds of incomprehensible error messages, and the upgrade will fail. *sigh*