I'm using STS 2.8.0 (production release) and Java JDK 1.7 set to a compliance level of 1.7. I had a project in STS that was using Grails 2.0.0.M2. I downloaded Grails 2.0.0.RC1 and made it the default version within STS. STS correctly detected that my project needed upgrading to the new version of Grails.
The upgrade of my project to Grails 2.0.0.RC1 produced the following warning:
warning: [options] bootstrap class path not set in conjunction with -source 1.6
If I create a new Grails project in STS, I also get this warning. Does anyone have any idea what causes this - is it Grails or is it STS?