If your workspace has spaces in the name then it breaks the wordir param.

It uses "-Dgrails.work.dir=/var/lib/jenkins/jobs/Job With Spaces/workspace//target" by default with that quoting and so breaks.

Should have single quotes around the directroy. Setting the grails.work.dir manually to '${WORKSPACE}/.grails' with the single quotes in the interface seems to work around the issue but is a bit of a hack.