I have a lot of Grails projects built by Jenkins and I got strange problems because I did not know I had to specify unique grails.work.dir for each project.
If I leave grails.work.dir blank all grails projects are built in $HOME/.grails/1.3.7/projects/workspace causing a mixup.
Can grails.work.dir be set automatically from the build name or something? If that is not possible, it must be documented that grails.work.dir is not really optional. You must specify a unique dir for each project, otherwise you can get into trouble.